Entropy 2012, 14(1), 1-23; doi:10.3390/e14010001
Article

Entropy Generation Analysis of Open Parallel Microchannels Embedded Within a Permeable Continuous Moving Surface: Application to Magnetohydrodynamics (MHD)

1 Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia 2 Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia 3 School of Mathematical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia
* Author to whom correspondence should be addressed.
Received: 11 October 2011; in revised form: 18 November 2011 / Accepted: 1 December 2011 / Published: 27 December 2011
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Abstract: This paper presents a new design of open parallel microchannels embedded within a permeable continuous moving surface due to reduction of exergy losses in magnetohydrodynamic (MHD) flow at a prescribed surface temperature (PST). The entropy generation number is formulated by an integral of the local rate of entropy generation along the width of the surface based on an equal number of microchannels and no-slip gaps interspersed between those microchannels. The velocity, the temperature, the velocity gradient and the temperature gradient adjacent to the wall are substituted into this equation resulting from the momentum and energy equations obtained numerically by an explicit Runge-Kutta (4, 5) formula, the Dormand-Prince pair and shooting method. The entropy generation number, as well as the Bejan number, for various values of the involved parameters of the problem are also presented and discussed in detail.
Keywords: MHD; Joule heating; viscous dissipation; suction/injection; Entropy Based Surface Micro-Profiling (EBSM); embedded open parallel microchannels

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MDPI and ACS Style

Yazdi, M.H.; Abdullah, S.; Hashim, I.; Sopian, K. Entropy Generation Analysis of Open Parallel Microchannels Embedded Within a Permeable Continuous Moving Surface: Application to Magnetohydrodynamics (MHD). Entropy 2012, 14, 1-23.

AMA Style

Yazdi MH, Abdullah S, Hashim I, Sopian K. Entropy Generation Analysis of Open Parallel Microchannels Embedded Within a Permeable Continuous Moving Surface: Application to Magnetohydrodynamics (MHD). Entropy. 2012; 14(1):1-23.

Chicago/Turabian Style

Yazdi, Mohammad H.; Abdullah, Shahrir; Hashim, Ishak; Sopian, Kamaruzzaman. 2012. "Entropy Generation Analysis of Open Parallel Microchannels Embedded Within a Permeable Continuous Moving Surface: Application to Magnetohydrodynamics (MHD)." Entropy 14, no. 1: 1-23.

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