Browsing by Author "Basem,A."

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Effect of temperature on the mechanical properties of aluminum polycrystal using molecular dynamics simulation
(Elsevier Ltd, 2024) Lin,P.; Basem,A.; Alizadeh,A.; Nasser,E.N.; Al-Bahrani,M.; Chan,C.K.; Emami,N.
The initial temperature has a considerable effect on aluminum polycrystals' physical stability and mechanical performance, with the possibility to optimize their mechanical properties for practical applications. Thus, using a molecular dynamics technique, the effect of temperature on the mechanical properties of aluminum polycrystals is studied. Stress-strain curves, ultimate strength, and Young's modulus were all measured at temperatures of 300, 350, 400, and 450 K. The findings from MD simulations show that the initial temperature significantly affects the physical stability and mechanical performance of designed aluminum polycrystals. The aluminum polycrystal experiences a numerical increase in ultimate strength and Young's modulus from 6640 to 74.072 to 7.055 and 79.226 GPa, respectively, when subjected to the optimal initial conditions of 350 K. With further increasing temperature to 450 K, ultimate strength and Young's modulus decrease to 6.461 and 74.413 GPa, respectively. The observed decrease in ultimate strength and Young's modulus of the aluminum polycrystal as the temperature increased from the optimal condition of 350 K–450 K can be attributed to the weakening of interatomic attraction forces at higher temperatures. This reduction in interatomic bonding strength resulted in decreased material stiffness and resistance to deformation, leading to lower ultimate strength and Young's modulus values. This study's novelty lies in its comprehensive assessment of the initial temperature's effects on the mechanical performance of aluminum polycrystals, providing valuable insights for practical applications and advancing beyond previous efforts in the literature. © 2024 The Authors
Citation Count: 2
Entropy and energy analysis of water/silver nanofluid flow in a microchannel by changing the angle of attack of a cam-shaped vortex generator
(Elsevier B.V., 2024) Bayat,M.; Salahshour, Soheıl; Jaafar,M.S.; Dayoub,M.S.; Akbari,O.A.; Marzban,A.; Sarlak,R.
Background: This study simulates the laminar forced flow of water/silver nanofluid in solid nanoparticle volume fractions ranging from 0 % to 6 % in a microchannel with vortex generators. For Reynolds numbers 100 to 800, the angle of attack of the vortex is changed from 0 to -90° Methods: The finite volume method is used for the 2D numerical study. Increasing the angle of attack leads to greater local flow mixing, which diffuses heat towards the upper parts of the flow, resulting in a favorable microchannel temperature distribution. During the movement of the fluid, the temperature difference between the surface and the fluid decreases. In addition to local friction, shear stress is also responsible for the friction factor. If the Reynolds number is high and the angle of attack is -30°, then the Nusselt number becomes significant. After passing the vortex generators, the effective flow area is higher, which is due to the higher effective flow area. Among the studied cases, the highest friction occurs for an angle of attack of -90° Significant findings: For higher volume fractions of nanoparticles (φ), the effect of fluid velocity dissipation and friction factor variations are higher. To limit entropy generation, higher Reynolds numbers and nanoparticle concentrations could be used. Changing the vortex generator angle has a limited influence on the entropy generation. © 2024 The Author(s)