A comparative study of longitudinal fins of rectangular, trapezoidal and concave parabolic profiles with multiple nonlinearities

被引:81
作者
Torabi, Mohsen [1 ]
Aziz, Abdul [2 ]
Zhang, Kaili [1 ]
机构
[1] City Univ Hong Kong, Dept Mech & Biomed Engn, Hong Kong, Hong Kong, Peoples R China
[2] Gonzaga Univ, Sch Engn & Appl Sci, Dept Mech Engn, Spokane, WA 99258 USA
关键词
Analytical solution; Longitudinal convective-radiative fins; Linear emissivity and thermal conductivity-temperature variations; Power law heat transfer coefficient; DEPENDENT THERMAL-CONDUCTIVITY; CONVECTIVE STRAIGHT FINS; HEAT-TRANSFER; RADIATIVE FIN; EFFICIENCY;
D O I
10.1016/j.energy.2012.11.052
中图分类号
O414.1 [热力学];
学科分类号
摘要
This paper establishes the performance characteristics of convective radiative longitudinal fins of rectangular, trapezoidal and concave parabolic profiles with simultaneous variation of thermal conductivity, heat transfer coefficient and surface emissivity with temperature. The convection and radiation sink temperatures were assumed to be non-zero. The calculations are carried out using the differential transformation method (DTM). The accuracy of the DTM is confirmed by comparing its predictions with the results from an analytical solution and a well-tested numerical procedure. A new idea of volume adjusted fin heat transfer rate, fin effectiveness, and fin efficiency is introduced to compare the performances of trapezoidal and concave parabolic fins with the rectangular fin. Results presented illustrate the effects of thermal conductivity parameter, emissivity parameter, convection conduction parameter, radiation conduction parameter, and dimensionless convection and radiation sink temperatures on the performance of fins. (C) 2013 Elsevier Ltd. All rights reserved.
引用
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页码:243 / 256
页数:14
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