Entropy Generation Analysis of Channel Flow with Wall-Attached and -Detached Heated Blocks

• Main Authors: Ying-Jui Huang, 黃盈瑞
• Other Authors: C. I. Hung
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/84701799813096544226

碩士 === 國立成功大學 === 機械工程學系 === 89 === Abstract This study main employ “Second Law of Thermodynamics (Entropy generation)“viewpoint and Local (Average) Nusselt number to analysis the effects of incompressible laminar channel flow fluid, wall heat transfer characteristics and friction coefficient with Wall-Attached and Wall-Detached Heated Blocks and staggered or in-line blocks. The governing equations are solved by a Finite-volume-based Finite-Element method .In this study, no-stagger grid or collocation are used to solve the Navier-Stokes equations. The parameters interested include (1) entrance Reynolds number (Re), (2) the ratio of block height to channel height (H/2B), (3) the distance between two blocks staggered (S/H), (4) the ratio of interval (blocks detached from wall) to channel height (C/H). Moreover, the enhancement in heat transfer is accompanied with increase in the friction loss to fluid flow. The reduce friction loss and increase heat transfer reach balance. We suppose to discuss the optimum efficient. For a heated flow field, a constant heated wall temperature is considered along blocks. The distributions of heat transfer coefficient and the physical phenomena of this flow field are presented.