Investigation of Dimple Fins and Cone Fins for Heat Transfer Enhancement

• Main Authors: Tzu-Hao Lo, 羅自皓
• Other Authors: Jin-Tsing Hong
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/qm43hp

碩士 === 國立臺灣科技大學 === 機械工程系 === 99 === In this thesis using Computational Fluid Dynamics applications to discussed the heat transfer and flow performance for fin-type exchanger channel characterization. Investigations of dimples channel containing three parameters flow and changes patterns of the cones channel to analysis the geometry with heat transfer efficiency and resistance relationships. There have two part in this thesis, at first to study dimples channel which are changes geometric parameters for heat transfer and fluid in the relationship. Second, retain the outstanding performance of the dimples channel in general conditions then change the pattern for the cone case, and compare the differences between. Heat transfer can be enhanced by increase the depth of dimple-shaped, but the resistance will also increase. Narrow diameter of dimple-shaped that heat transfer will increase slightly, but increased the resistance too, and the dimple-shaped channel diameter and depth in the ratio of 5 have the best heat dissipation efficiency in this study. Cone-shaped design is lower than dimple-shaped of the coefficient friction. The cone-shaped vortex is smaller than the dimple-shaped vortex from streamline of view. The results show dimple-shaped can effectively increase the wide range of eddy current than cone-shaped design, thereby increasing the cooling efficiency.