Latife Berrin Erbay¹, Mehmet S. Ercan², Birsen Sülüs³ and M. Murat Yalçÿn⁴

¹ Osmangazi University, School of Engineering and Architecture, 26480 Batÿ Meselik, Eskisehir, Turkey.
Tel: +90 222 239 1074 - 3366; Fax: +90 222 229 05 35, E-mail: [email protected]
² Ford - Otosan Ïnönü Plant, 26140 Eskisehir, Turkey.
E-mail: [email protected]
³ Osmangazi University, School of Engineering and Architecture, 26480 Batÿ Meselik, Eskisehir, Turkey.
Tel: +90 222 239 1074 - 3374; Fax: +90 222 229 05 35, E-mail: [email protected]
⁴ TEI-TUSAS Engine Industries, Inc. Çevre Yolu 162 26003, Eskisehir, Turkey.
E-mail: [email protected]

Received: 22 July 2003 / Accepted:31 December 2003 / Published: 31 December 2003

Abstract: Two dimensional numerical analysis of entropy generation during transient convective heat transfer for laminar flow between two parallel plates has been investigated. The fluid is incompressible and Newtonian and the flow is the hydrodynamically and thermally developing. The plates are held at constant equal temperatures higher than that of the fluid. The bottom plate moves in either parallel or in inverse direction to the flow. The governing equations of the transient convective heat transfer are written in two-dimensional Cartesian coordinates and solved by the finite volume method with SIMPLE algorithm. The solutions are carried for Reynolds numbers of 10², 5x10² and 10³ and Prandtl number of 1. After the flow field and the temperature distributions are obtained, the entropy values and the sites initiating the entropy generation are investigated. The results have indicated that the number of the entropy generation has its highest value at the highest Reynolds and Br/Ω values, which is obtained at counter motion of the lower plate. The lowest average number of the entropy generation on the bottom plate is obtained in parallel motion. The corners of the channel plates at the entrance play the role of active sites where the generation of entropy is triggered.

Keywords: laminar flow; parallel plate; entropy generation.