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ICOAMS: 22 papers
No Paper No Submitted Paper
1 ICOAMS 13728
(Wijianto, Muhamad Diar Ibnu Rijal)
Corresponding Author: Wijianto
Publication: Materials Science Forum
Abstract: The aim of this research is to investigate the effect of alkaline concentration treatment conditions on tensile and flexural properties of banana fiber reinforced polyester resin composite. Methodology of this research started by banana stem was cut into 1 meter of length and immerse in water until 1 week. Banana fiber was extracted from banana stem using manual extraction. After that banana fiber was treated using sodium hydroxide (NaOH) treatment. There are three variation of NaOH concentration treatment, 5%, 10% and 15% for 1 hour immersion time at room temperature. Hand lay-up technique was used in composite fabrication with 40% fiber volume fraction at random orientation of banana fiber. Based on this research result can be concluded that composite with NaOH treatment has a better tensile and flexural properties if compared with untreated fiber. Banana fiber composite treated with 5% NaOH concentration show the highest tensile strength and tensile modulus. From structure macro observation of composite specimen after tensile and flexural test show that the untreated fiber has a lot of fiber pull out, its occurs because the weak interfacial bond strength between matix and fiber. On the other hand, the treated banana fiber composite show a slight fiber pull out, because composite has high interfacial bond strength between matrix and fiber.
2 ICOAMS 13721
Characterization of Bamboo Tutul Charcoal Particle Produced by High Energy Ball Milling Shaker Type
(Supriyono, B Susilo)
Corresponding Author: Supriyono
Publication: Materials Science Forum
Abstract: . Bamboo charcoal as carbon nanoparticle has various advantages in terms of physical and chemical properties. There are many type of bamboo available. In this study, bamboo tutul charcoal nanoparticle is produced using High Energy Ball Miling (HEBM) shaker type. The objective of this research is to characterize bamboo tutul charcoal particles produced by HBEM process. The HEBM process is conducted for 2 million cycles at 300 rpm. The mixed of charcoal powder of 200 mesh and ball milling of steel with diameter of 1/4 inch was placed in vial made from the stainless steel cylinder with a diameter of 2 inch and a length of 120 mm. In this research, the empty space of the vial is varied for the sake of the ball movement. The variations of the empty space are 1/2, 1/3, 1/4, and 1/5 volume of the vial. The result shows that the variation of the empty volume on the vial cannot be the main benchmark to determine bamboo charcoal particle size. The more empty space on the vial, the more freely the ball movement, but this situation makes bamboo charcoal bone to the edge of tube so that grinding with uneven steel balls. From SEM/EDX testing can be known the visualization of bamboo charcoal particle and its composition. From SEM photo visualization shows that average bamboo charcoal particle shape is not perfect and the average size percentage reaches nanometer scale size
3 ICOAMS 13712
Experiment on Recycled Aluminum Alloys by Metal Casting Process
(Ahmad Farhan, Akhyar, Masri Ali)
Corresponding Author: Akhyar
Publication: Materials Science Forum
Abstract: In this present work, the effects of recycled aluminum scraps on the impact and hardness properties and microstructures with a melting process are studied. The method was conducted to determine an impact toughness by Charphy pendulums; hardness materials by Vickers's test; and chemical composition by spectroscopy. Four types of aluminum scraps have been recycled using a metal casting process. They are beverage cans, aluminum profile bar waste, gasoline engine piston, and scrap pans. The results show that the maximum hardness obtained is 54.13 VHN on the material of the gasoline engine piston. The lowest hardness is 26.88 VHN which is obtained for pan aluminum recycle. The highest impact test result is obtained on an aluminum pan material which is 40.3 J/mm2 in average and the lowest value obtained is on the gasoline engine piston material which is 1.7 J/mm2 in average.
4 ICOAMS 13709
Marshall Characteristics of ACWC Using CRM As Additive
(Pria Rizky Candra, Henri Siswanto)
Corresponding Author: Henri Siswanto
Publication: Materials Science Forum
Abstract: The significance of this research is to find out the effect of the addition of crumb rubber motorcycle tire waste CRM on asphalt concrete wearing course (ACWC) mix. Two sizes of CRM that are used are CRM that passes the filter no.50 and no.100, while the content of CRM are 0%, 0.5%, 1%, 1.5%, 3%, 4.5%, and 6% against aggregate weight. Marshall Method is used in this research. The analysis is based on Marshall parameters namely stability, flow, Marshall question, VIM, VMA, and VFA. The result of this research indicates that the size of CRM, No. 50 and No. 100, affects Marshall stability of conventional asphalt mix. Best CRM addition is CRM No. 100 with the content of 1%.
5 ICOAMS 13708
Effect of Latex to Minimize the Use of Asphalt in Asphalt Concrete Wearing Course
(Henri Siswanto)
Corresponding Author: Henri Siswanto
Publication: Materials Science Forum
Abstract: One aspect that needs to be considered in the application of asphalt pavement is the fact that asphalt is a non-renewable resource which requires constant maintenance throughout its lifetime. Thus, developing a mix with asphalt contents reduced to the minimum is a challenge in and of itself. Latex, in this case, would seem to be potentially viable additives. The aim of this research is to investigate the effects of using latex as an additive to minimize the use of asphalt in asphalt concrete wearing courses (ACWC). Four varying amounts of latex were mixed with asphalt at 0%, 2%, 4%, and 6% of the total weight of an asphalt binder. A wet process was then employed to blend the mixtures together. Afterward, the latex-asphalt mixtures were added to an aggregate to form various mixtures ranging from 5% to 7% of the aggregate and the incremental weight of 0.5% of the latex-asphalt ACWC. For each latex-asphalt-aggregate mixes, the optimum binder content was determined based on stability, flow, Marshall quotient, voids in the mineral aggregate (VMA), voids in the mixture (VIM) and voids filled by the binder (VFB). The results of this experiment indicated that the addition of latex reduces the need for asphalt contents.
6 ICOAMS 13706
Molarity Relationship of Electrolyte Solution to Aluminum Anodizing Process on Morphology and Corrosion Resistance
(Putu Hadi Setyarini, Purnomo, Femiana Gapsari)
Corresponding Author: Putu Hadi Setyarini
Publication: Materials Science Forum
Abstract: One type of aluminum that has a wide use is AA 6061 because it has mechanical properties and corrosion resistance is quite good when compared to other types of aluminum [1-3]. Corrosion resistance of this alloy can be improved even better by using the anodizing process. In this study, the results of anodizing AA 6061 will be investigated using molarity of sulfuric acid 1, 2 and 3, with a processing time of 60 minutes and temperature of 10oC electrolyte solution to morphology and corrosion rate. The cathode used in this process is titanium alloy. After the anodizing process was completed, a Scanning Electron Microscopy (SEM) test was carried out to examine the surface morphology produced, testing Energy Dispersive X-Ray (EDX) to determine the chemical composition of the anodic layer formed after the anodizing process and testing the corrosion rate using Sodium chloride 3, 5%. From the test results, it appears that there is an increase in pore size and corrosion rate along with an increase in the molarity of the electrolyte solution. In addition, there is also an increase in sulfate levels and a decrease in titanium deposits in anodizing results with higher solution molarity.
7 ICOAMS 13693
Study of dimensional changes on alkali treated zallaca fibre reinforced unsaturated polyester composites under different aqueous environments
(Dody Ariawan, Faishal Asfar Akbar, Eko Surojo)
Corresponding Author: Dody Ariawan
Publication: Materials Science Forum
Abstract: In this research, alkali treated zallaca fibre reinforced with high density polyethylene (HDPE) composites are subjected to water immersion tests in order to study the dimensional changes and flexural properties of composites. Composites were frabricated using compression molding method with zallaca fiber content of 30% vt. Composite specimens were immersed under three different solution included distilled water, sea water and acidic solutions for 2 months at room temperature. The highest dimensional changes was recorded for composite immersed in seawater followed by acidic solution and distilled water. The dimensional changes of Zallaca fibre reinforced HDPE in different solution were found to follow a Fickian behaviour. Alkali treated fiber composites after immersion has lower results both in dimensional changes and its slope than untreated fiber composites in different aquaeous environment. The severe degradations are observed by using Scanning Electron Microscopy (SEM) that showed microcracks growth, and degradation of interfacial region between fiber and matrix. Flexural properties of composites decrease after immersion stage in different values.
8 ICOAMS 13684
Effect of increasing salinity to corrosion resistance of 5052 aluminum alloy in artificial seawater
(Agung Setyo Darmawan, Pramuko Ilmu Purboputro, Agus Dwi Anggono, Masyrukan, Abdul Hamid)
Corresponding Author: Agung Setyo Darmawan
Publication: Materials Science Forum
Abstract: The purpose of this research is to investigate the corrosion resistance of 5052 aluminum alloy to increasing salinity in sea water. Salt spray chamber was used to measure and compare the corrosion rate of 5052 aluminum alloy with weight reduction method. The experiment was conducted by varying the three concentrations of NaCl solution to compare the corrosion rate of the metal. The test specimens used were aluminum alloy 5052 with length of 6 cm, width of 4 cm and thickness of 0.7 cm. The tests were carried out for 48 hours, aggressive NaCl solutions with concentrations of 3.5%, 4% and 5% were used as an artificial sea water corrosion medium and the temperature in the test chamber was maintained at 35 oC. Corrosion rate for 3.5% NaCl solution, 4% NaCl solution and 5% NaCl solution were 0.197 mm/year, 0.541 mm/year and 0.558 mm/year, respectively. The higher concentration leads to greater corrosion rate.
9 ICOAMS 13669
Predicting Surface Hardness of Commercially Pure Titanium under Ion Implantation Process
(Agung Setyo Darmawan, Waluyo Adi Siswanto, Bambang Waluyo Febriantoko, Abdul Hamid, Tjipto Sujitno)
Corresponding Author: Agung Setyo Darmawan
Publication: Materials Science Forum
Abstract: One of the surface treatments to improve the hardness of the surface is by ion implantation process. This paper presents an equation to predict the surface hardness with the variable of the process time in ion implantation surface treatment. The hardness of three surfaces data were collected experimentally from various process times, i.e. 140 minutes, 280 minutes and 560 minutes. Lagrange polynomial interpolation was then used to generate quadratic mathematical formula of the surface hardness based on experimental data. The verification results show that the proposed equation accurately predict the surface hardness of commercially pure (cp) titanium under ion implantation process with the error less than 0.5 %. This equation can be used to set the appropriate treatment process time to achieve the expected surface hardness without costly trial experimental settings.
10 ICOAMS 15727
Mechanical Properties of Concrete Block Reinforced with Recycle HDPE and Coal Bottom Ash
(Agus Dwi Anggono, Zaennal Muttaqiem, Agung Setyo Darmawan, Tri Widodo Besar Riyadi, Agus Yulianto, Bambang Waluyo Febriantoko, a)
Corresponding Author: Agus Dwi Anggono
Publication: Materials Science Forum
Abstract: Garbage is a serious problem if it is not managed properly, both organic and non-organic. Inorganic waste, for example plastic, metal, glass and charcoal from coal combustion are difficult to decompose in the soil. HDPE (high density polyethylene) plastic is one type of inorganic waste that is difficult to decompose, but this plastic can be recycled. The objective of the study is to develop light cement blocks by using waste of HDPE, coal bottom ash and cement. The research guide was refered to SNI (Indonesian National Standard) as a product standard reference. SNI-03-6825-2002 for testing of the compressive strength and SNI 03-0349-1989 for the testing of the water absorption. The size of the specimen was 5 x 5 x 5 cm. In this study, the compositions of HDPE : coal bottom ash were varied by 70%: 0%, 60%: 10%, 50%: 20%, and 40%: 30%. The holcim cement was 30% of the volume fraction. Testing was conducted after the speciments stay in 7 and 28 days. For the 7 days old of specements, the highest compressive strength was resulted from 50%:20% composition with the value of 5.88 N/mm2. For the 28 days old speciments, the highest compressive strength was 8.34 N/mm2. The lowest water absorbtion test was delivered by the more coal bottom ash in the composition of 40%:30%. It was 16.971%. The more coal bottom ash, the less water absorbtion. The mean of speciments density was 1.076 gr/cm3.
11 ICOAMS 15719
Preliminary Study of ABS/Chitosan Blend Polymer for DMFC Membranes
(Nur Hidayati, Muhammad Mujiburohman, Hamid Abdillah, Herry Purnama, Arnaldi Dwilaksita, Fara R. Zubaida)
Corresponding Author: Nur Hidayati
Publication: Materials Science Forum
Abstract: The low cost of ABS polymer and natural polymer chitosan offer attractive chemical and physical properties for direct methanol fuel cells (DMFC). Blend membrane made of ABS and chitosan were synthesized and characterized for water uptake, swelling degree and ion exchange capacity (IEC) and methanol crossover to investigate the applicability in DMFC. This membrane was also assessed for its intermolecular interactions and thermal stability using FTIR and TGA compared to the pristine membrane. The water absorption and IEC values were affected by membrane network structure. The polymer blend had better thermal stability and a reduction of methanol permeability, this indicated the viability of utilization these materials as polymer electrolyte membrane in DMFC.
12 ICOAMS 15713
(Joko Suparno, Dimas Ardiansyah Halim, Junaidi, Ady Setiawan, Marwan Effendy, J. Jamari)
Corresponding Author: Dimas Ardiansyah Halim
Publication: Materials Science Forum
Abstract: Wear and tear occurs in rail wheels due to varying surface contact between wheel and railway. Many materials are used to minimize the wear and tear effect of friction, one of which is graphite. Graphite has been known having dry lubricating ability. To find out the effect of graphite lubrication on wear and tear level of wheel and railway, an experiment-based research is important to conduct. This research started with designing the construction of disc-on-disc wear and tear testing instrument, wheel specimen using EMS45 material and railway specimen using VCL140 material. Dry lubricant used was graphite bar polished onto wheel specimen surface. The result of research showed that graphite could adhere to wheel surface and penetrate into the fissures of contact between wheel and railway. Varying graphite polishing conducted once in 5 minutes and 10 minutes resulted in different volume of graphite filling in the fissures of wheel specimen surface. The more the graphite volume polished onto wheel specimen surface, the less is the material loss due to surface contact. Graphite’s ability of filling in this contact area fissure when administered in appropriate volume would enable graphite to be a good dry lubricant. If this graphite polishing technique is applied to rail wheels, it would be beneficial, as it can lengthen the wheel life.
13 ICOAMS 15694
Synthesis and Characteristics of Inorganic Polymer Materials Geopolymerized from Ash of Brickyard
(Nguyen Hoc Thang)
Corresponding Author: Nguyen Hoc Thang
Publication: Materials Science Forum
Abstract: Inorganic polymer materials known as geopolymer-based materials are always interesting topics for researchers. Geopolymer is environmentally friendly material which has been potential applications for many different fields such as technical materials, building materials, insolation or refractories, and others. This study used ash of brickyard (AB) as a raw material for geopolymerization process to develop novel materials with high porosity. AB is industrial waste of the brick factories that need to be managed to reduce their negative impact to the environment. AB contains high alumino-silicate resources were mixed with sodium hydroxide solution for 10 minutes to obtain the geopolymer pastes. Sodium hydroxide solution was used as an alkaline activator to form geopolymer paste. The geopolymer paste was filled into 5-cm cube molds according to ASTM C109/C109M 99, and then cured at room temperature for 28 days. These products were then tested for compressive strength, volumetric weight, and water absorption. Results indicated that the material can be considered lightweight with a compressive strength at 28 days that are in the range of 8.1 to 15.4 MPa, volumetric weight around 600kg/m3 and water absorption is under 210.65 kg/m3. The properties of geopolymer products were also determined by analytical techniques that included mineral composition by X Ray Diffraction (XRD) and microstructure by scanning electron microscope (SEM).
14 ICOAMS 15687
Impact-specific essential fracture work of banana fiber reinforced low-density polyethylene composites
(Purnomo, Putu Hadi Setyarini, Dwi Sulistyaningsih)
Corresponding Author: Purnomo
Publication: Materials Science Forum
Abstract: The aim of this study is to investigate the behavior of banana fiber (BF)-low-density polyethylene (LDPE) composite fracture toughness. The LDPE pellets are transformed into powder form which is then functioned as a matrix reinforced with banana fiber (BF). The composites were formed by injection molding techniques which are followed by atmospheric-pressure annealing at 90oC for 24 hours. The composite fracture toughness behavior was evaluated using the essential work of fracture (EWF) approach. The results show that fracture toughness which is characterized by essential fracture work (we) value increases by the presence of BF up to 5 wt.%. However, the we value starts to decrease in the composite with BF content of 6 wt.%. There is a mismatch about the phenomenon of non-essential fracture work. Stress-whitened zones can be seen and observed but non-essential fracture work based on curves is a negative value.
15 ICOAMS 15681
Strength Performance of Micro Alumina Reinforced Direct Recycled AA6061 Chips Based Matrix Composite
(M. S. Msebawi, Jayaprakash Murugesan , S. Shamsudin , Mohammed H. Rady , H. M. Sabbar, Mohammad Sukri Mustapa)
Corresponding Author: Muntadhar Sabah
Publication: Materials Science Forum
Abstract: Ultimate tensile strength (UTS) becomes a primary concern in direct recycling of metal chips. This study investigates the influences of preheating temperature, preheating time and volume fraction of alumina on the tensile strength performance. The parameters of temperature, time and volume fraction of micro alumina were varied between 450 - 550 oC, 1 - 3 hours and 5 - 15% respectively. The full factorial design with center point analysis was employed to analyse the effect of process variables on the response. A total of 19 experimental runs were performed through the hot extrusion operation. The preheating temperature and volume fraction were identified as the key variables affecting the UTS. An optimum UTS was obtained for the profile extruded at 550 oC, 3 hours duration and 5% volume fraction of alumina.
16 ICOAMS 15670
Effect of the heat treatment on tensile strength of Direct Recycled Aluminium Alloy (AA6061)
(Mohammed H. Rady , Ahmed Sahib Mahdi, Mohd Sukri Mustapa, S. Shamsudin, M. A Lajis, M. S. Msebawi )
Corresponding Author: Mohammed Hussien Rady
Publication: Materials Science Forum
Abstract: Products by solid-state recycling of aluminum chips in hot extrusion process were controlled by temperature related parameters using preheating temperature 450 °C, 500 °C, and 550 °C for 1 hr, 2 hr, and 3 hr preheating time. By using Design of Experiments (DOE), the results found that the preheating temperature is more important to be controlled rather than the preheating time and increasing of temperature led to the high tensile strength. The profile extruded at 550 °C with 3 hr duration had gained the optimum case to get the maximum tensile strength. For the optimum case, heat treatment was carried out using quenching temperature at 530 ºC for 2 h and aging process at 175 ºC for 4 h. The tensile strength of extrudes specimen was improved significantly compared to those of non-treated specimen.
17 ICOAMS 16714
Wear resistance of Pre-ECAP Annealing A356 Al Alloy with 1.5 wt.% TiB2
(Muhammad Syukron, Zuhailawati Hussein, Anasyida Abu Seman)
Corresponding Author: Muhammad Syukron, Ph.D
Publication: Materials Science Forum
Abstract: The combination of heat treatment, addition of grain refiner and ECAP processing is used to improve mechanical properties and wear resistance of A356 Al alloys with 1.5 wt.% TiB2. The alloys were grouped into as-cast and pre-ECAP annealing. The alloys were characterized with hardness and wear testing, optical microscopy and SEM. The ECAP processing was done through BA route for 4 passes and it improved hardness, distribution of TiB2 and Si particles in the aluminium matrix and increased wear resitance of pre-ECAP annealing specimen.
18 ICOAMS 16707
Preparation of Powder Layer Using Vibration Controlled Glass and Brass Nozzles for Additive Manufacturing
(Teguh Pudji Purwanto, Alva Edy Tontowi, Rachmat Sriwijaya)
Corresponding Author: Teguh Pudji Purwanto
Publication: Materials Science Forum
Abstract: Making scaffolds for bone repair is increasingly needed. The material used can be in the form of molten material or powder. For powder materials, Direct Laser Melting technology can be used so that the development of powder material deposition methods is needed. This is because there is a weakness in the deposition method which is assisted by gas pressure. This study uses two types of nozzles, the first type is made of brass with diamater 0.5, 0.8 and 1.0 mm, while the second type is made of glass with a nozzle mouth diameter of 1.0 mm. The powder material used is polyester resin with a diameter of 5-15 microns in black, and diamater 7-75 microns in red. The nozzle containing the powder is vibrated, so that a flow will occur. This flow characteristic will affect the form of deposition that occurs. Powder flow on the nozzle made of brass and glass shows a similarity to the 1.0 mm nozzle diameter. For nozzle diameter smaller than 1.0 mm, the effect of grain size will affect flowability. Smoothness of the surface will affect the nature of the powder flow. On a smooth glass surface, the friction force between the powder and the wall of the nozzle is small, so that for the small powder size the flow cannot be controlled. The best deposition form is obtained at a frequency of 950 Hz with a brass nozzle and 1.0 mm diameter.
19 ICOAMS 17711
Stress and Displacement Analysis on Profile T and I with Various Loading Conditions
(Akhyar, Husaini, Iskandar Hasanuddin)
Corresponding Author: Akhyar
Publication: Materials Science Forum
Abstract: The stress distribution and deformation formed by various loading conditions are a crucial thing to be considered during design. Stress and deformation maximum area should be a primary concern, and this study will discuss the stress analysis and displacement of the bike frame (T-I profiles) through the Finite Element Method (FEM), then five scenarios loading conditions have been applied. Loading conditions are the static start-up, steady-state pedaling, vertical-horizontal impact, and rear wheel breaking. Cross-section of bike frame comprises into two forms. There are “T” profile on the main frame and “I” profile on stay. The results show for the loading conditions reach maxima respectively of 18.4, 21.98, 36.83, 14.3 MPa (Von Mises stress). Maximum displacement for the different loading conditions are 0.11, 0.13, 0.23, 0.041, and 0.018 mm.
20 ICOAMS 17686
Hardness Optimization Based on Treatment Time and Gas Pressure in the Plasma Nitriding of Aluminium Alloys
(Tri Tjahjono, Tri Widodo Besar Riyadi, Bambang Waluyo Febriantoko, Margono, Suprapto, Tjipto Sujitno )
Corresponding Author: Tri Widodo Besar Riyadi
Publication: Materials Science Forum
Abstract: Plasma nitriding has attracted much interest to improve the hardness of aluminium alloys. However, the contradictive properties can be produced on the metal surface due to saturated condition of the diffused nitrogen atom in the metal surface layer. The objective of this work was to investigate the effect of nitriding time and gas pressure to improve the hardness of T2025 aluminium using plasma nitriding. The nitriding processes were conducted in a DC glow discharge with nitrogen gas flowing inside the vacuum chamber. Firstly, the sample was nitrided using a fix gas pressure at 1.2 mbar with the varied nitriding times for 3, 4, 5 and 6 hours. The optimum time producing the highest hardness of the surface was then used in the next nitriding process with varied gas pressure at 1.2, 1.4, 1.6 and 1.8 mbar. The optimum gas pressure producing the highest hardness was then used again in the last nitriding process using varied nitriding time for 3, 4, 5 and 6 hours. The result showed that the highest hardness was achieved using the gas pressure and nitriding time of 1.6 mbar and 4 hours, respectively. The formed AlN phase on the aluminium surface was identified by XRD, whereas the surface morphology was observed by SEM image. Compared to the intreated sample, the hardness of the treated samples was significantly high.
21 ICOAMS 17685
Thickness Changes during the Creep Deformation of Sanicro 25 Austenitic Steel
(Tri Widodo Besar Riyadi, Fakhri Hasamulhaq Ahmad, Ibham Veza, Agung Setyo Darmawan, Agus Dwi Anggono)
Corresponding Author: Tri Widodo Besar Riyadi
Publication: Materials Science Forum
Abstract: The Abaqus software was used to simulate creep behaviour of a cylindrical tube of Sanicro-25 austenitic steel under an internal pressure of 11.3 MPa at a uniform temperature at 750 °C. The data used for the simulation input were obtained from the experimental data of a previous work. The hidden information of material parameters was estimated from the shape of creep strain versus time plots obtained from the experimental data. The validated results between the simulation and the experimental data produced the material parameter of the creep power law which were set at 2.6 x 10-22 for the power law constant and 9 for the stress exponent. The parameters were further used to explore the stress and strain inside and outside of the tube wall and the thickness changes of the tube wall.
22 ICOAMS 17680
Numerical Investigation for Convective Heat Transfer of Carbon Nano Tube (CNT) over a Stretching Surface
(Muhaimin Ismoen, Radiah Bte Mohamad, R. Kandasamy, Suliadi Firdaus Sufahani, Md. Fazlul Karim)
Corresponding Author: Muhaimin Ismoen
Publication: Materials Science Forum
Abstract: The performance of carbon nanotube (CNT) nanofluids on convective heat transfer over a stretching sheet was investigated under thermal stratification and magnetic field effects. Water, engine oil and ethylene glycol are used as the base fluids. The governing equations are transformed into a system of coupled nonlinear ordinary differential equations using similarity transformations and solved numerically using the fourth-order Runge–Kutta–Fehlberg in conjunction to shooting method. The CNT nanofluids with an engine oil base fluid shows the highest thermal conductivity in comparison to ethylene glycol and water, respectively. Potential application of the thermal conductivity enhancement of CNT nanofluid is to increase the energy-efficient mechanical systems in heating, cooling and ventilation of the indoor environment.