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RISS 인기검색어
- 검색키워드
- 주제어 : Optimal homotopy asymptotic method (OHAM) (검색결과 4 건)
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Hamza Berrehal 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.6
An analytical analysis has been carried out to investigate the second law of thermodynamics in magnetohydrodynamic (MHD) boundary layer flow and heat transfer by moving wedge. The governing PDEs of momentum, energy, and entropy generation are converted into nonlinear ODEs via similarity variables and then solved analytically using the optimal homotopy asymptotic method. The expression of entropy generation number is obtained in dimensionless form. Results revealed that the minimum entropy production is achieved when the wedge moves in the opposite direction to the free stream (for the negative values of velocity ratio parameter λ). Moreover, the magnetic field influences the increase in entropy production.
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Analytical thermal analysis of air-heating solar collectors
S. E. Ghasemi,M. Hatami,D. D. Ganji 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.11
In this paper, Optimal Homotopy Asymptotic Method (OHAM) and Homotopy perturbation method (HPM) are applied to investigate heat transfer in the air-heating flat-plate solar collectors. Results for different values of active parameters are compared with numerical method (fourth order Runge-Kutta method). The results confirm the notion that the HPM method is more accurate than OHAM and efficient technique for finding exact solutions for differential equations which have great significance in different fields of science and engineering. Effects of air flow rate, width and length of the collector on thermal efficiency are examined. As an important outcome, increasing in the collector’s dimensions (width and length) make a decreasing in thermal efficiency, but increasing in air mass flow rates improve it.
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Heat transfer analysis of nanofluid flow in a channel with non-parallel walls
H. Berrehal,G. Sowmya 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.1
The aim of the current investigation is to explore the heat transfer of nanofluid flow in a channel with non-parallel walls. Two different nanoparticles, namely, Cu and Ag, with water as the base fluid are considered. The equations governing the flow are obtained using an appropriate similarity transform and solved analytically with the optimal homotopy asymptotic method (OHAM). Here, OHAM was first used to solve the problem to ensure a much more rapid convergence of the solution only after one iteration, with high efficiency. Comparative analysis was carried out to ensure the authenticity of the results. The effects of the involved parameters on fluid velocity, temperature, skin friction coefficient, and Nusselt number are presented in graphical and tabular forms with comprehensive discussions in this paper.
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Hamza Berrehal,Abdelaziz Maougal 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.1
We performed entropy generation analysis for a carbon nanotube (CNT) suspended nanofluid flow by a wedge with thermal radiation and convective boundary condition. The multi-wall carbon nanotube (MWCNT) with water as the base fluid was considered. Twodimensional governing equations were transformed by similarity method into a set of coupled nonlinear ODEs and then solved analytically using optimal homotopy asymptotic method (OHAM). Moreover, solutions of these equations were further utilized in a dimensionless equation of entropy generation. The analytical results indicated that the entropy generation can be reduced by increasing radiation parameter and reducing the convection through boundaries, while nanoparticles have influence to increase the entropy production.
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