標題: Analytical analysis and experimental verification of trapezoidal fin for assessment of heat sink performance and material saving
作者: Chen, Hong-Long
Wang, Chi-Chuan
機械工程學系
Department of Mechanical Engineering
關鍵字: Heat conduction;Heat convection;Analytical solution;Rectangular fins;Trapezoidal fins
公開日期: 5-Apr-2016
摘要: A quick assessment of the performance loss in association with material saving amid rectangular and trapezoidal fin is analytically investigated and experimentally verified. A novel dimensionless parameter - r(t) representing the ratio of the fin tip to base thickness - is used to simplify the fin equation. A dimensionless differential equation is derived based on the formulation and the corresponding closed form solution of the dimensionless temperature and fin efficiency is presented. It is found that the performance drop depends on various rt ratios, and the most pronounced performance difference occurs in the region between M = 1.7 and 2.5. Yet the performance difference between the rectangular and trapezoidal fin are quite insignificant at low velocity region; with the increasing of velocity, the performance loss ratio is gradually discriminated to reach the maximum performance loss between region of M = 1 and 2, then it begins to converge again toward M = 4. The recovering of the ratio is actually associated with the diverging and converging trend of the fin efficiency. The analytical results are in line with the experimental results. At a frontal velocity of 4 m/s, the predicted difference of heat transfer rate between trapezoidal and rectangular fin profile in terms of total heat transfer ratio is only 0.88%. (C) 2015 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.applthermaleng.2015.11.131
http://hdl.handle.net/11536/133662
ISSN: 1359-4311
DOI: 10.1016/j.applthermaleng.2015.11.131
期刊: APPLIED THERMAL ENGINEERING
Volume: 98
起始頁: 203
結束頁: 212
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