A Study of Flow Field and Conjugate Heat Transfer in a Turbulent Gas Flow on a Parallel Channel with Repeated Roughness Ribs

• Main Authors: Hao-Chieh Huang, 黃皓杰
• Other Authors: Ruey Tsai
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/dwb5ps

碩士 === 中原大學 === 機械工程研究所 === 91 === Fluid flows and heat transfer characteristics were analyzed for a constant fluid flowing turbulent through a parallel plate channel with rib-roughened and constant heat flux along both wall. After a finite entry length the flow becomes periodically developed. Fluid flow in the channel is modeled as a two-dimensional turbulent flow, with turbulent transport described by the modified low Reynolds number turbulent model. Computations were carried out in the fully-developed regime for different Reynolds numbers, and the heat conductivity ratio of rib-roughened-to-fluid flow and the ratio of pitch-to-height and the ratio of height-to-diameter. It is illustrated that some of the discrepancies and effects. It is found that the predicted heat transfer is very sensitive to the type of boundary conditions used in the numerical model. In addition, conduction in the channel wall is found to play a highly beneficial role in enhancing heat transfer.