DOI: http://dx.doi.org/10.18203/issn.2454-2156.IntJSciRep20190251

Inherent irreversibility impacts on thermal boundary layer flow over a mobile plate with convective surface boundary conditions

Sajjad Haider, Adnan Saeed Butt, Asif Ali, Yun-Zhang Li, Tufail Hussain

Abstract


Background: The irreversibility impacts on flow and heat transfer processes can be quantified through entropy analysis. It is a significant tool which can be utilized to deduce about the energy losses. The current study investigates the inherent irreversibility impacts during a flow of boundary layer and heat transfer on a mobile plate.

Methods: The flow is examined under thermal radiation and convective heat conditions. The fundamental governing equations of flow and heat phenomenon are transmuted into ordinary differential equations by employing similarity transmutations and shooting technique is utilized in order to solve the resultant equations. The temperature and velocity profiles are acquired to reckon Bejan and entropy generation number. Pertinent results are elucidated graphically for the movement of plate and flow in same and opposite directions.  

Results: A decline in temperature profile is noted with rise in values of Pr in both cases when the movement of surface and free stream is in similar and converse directions. A decrease in temperature is observed for both cases with increase in NR while with the rise in Biot number a, the temperature profile also increases. Entropy generation rate near the surface is high in case when surface and free stream are moving in opposite directions as compared to case when they move in same directions.

Conclusions: It is observed that irreversibility impacts are more remarkable when the movement of fluid and plate is in opposite direction. Moreover, irreversibility impacts of heat transfer are prominent in free stream region.

 



Keywords


Boundary layer, Entropy generation, Heat transfer, Thermal radiation, Convective boundary condition

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