Mixed Convection in a Backward-Facing Step with Discrete Heat Sources

• Main Authors: Chao-Ching Huang, 黃昭清
• Other Authors: Tsan-Hui Hsu
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/90127213582209612801

碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 95 === Mixed convection in a backward-facing step channel with discrete heat sources is numerically investigated in this study. The ambient fluid flows into the channel, through the backward-facing step, and becomes fully-developed flow before leaving the exit opening. Both the horizontal flat walls and the backward-facing step are kept adiabatic. Several discrete protruding heat blocks are situated on the bottom wall behind the backward-facing step. The governing equations include stream function, momentum function, and energy function. The controlled equations in dimensionless form coupled with corresponding boundary conditions are solved by using cubic spline collocation method in a personal computer. The governing parameters appearing in present study are Reynolds number, Re, Prandtl number, Pr, Grashof number, Gr, and several material parameters of the protruding heat sources. The numerical results of the flow fields are discussed with plots of isotherm, streamline and the data configuration. The results indicate that the Re number affects the heat transfer for the heat sources more significantly than the Gr number. In addition, enlarging the height of the heated blocks or increasing the distance between the heat sources will enhance the heat transfer from the heat sources.