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强化传热期刊
影响因子: 0.562 5年影响因子: 0.605 SJR: 0.211 SNIP: 0.361 CiteScore™: 0.33

ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.v7.i6.10
pages 361-369

Structural Optimization of Axially Grooved Flat Miniature Heat Pipes

M. Gao
Department of Mechanical and Materials Engineering Florida International University Miami, Florida 33173
Yiding Cao
Department of Mechanical and Materials Engineering, Florida International University, Miami, Florida 33174
Jerry E. Beam
Aerospace Power Division, Wright-Patterson Air Force Base, OH 45433
B. Donovan
Aerospace Power Division, Wright-Patterson AFB, OH 45433

ABSTRACT

Optimization of flat miniature heat pipes was carried out based on the existing and newly obtained experimental results and the quasi-Newton algorithms employing the BFGS (Broyden, Flether, Golfarb, Shanno) method. The heat pipe contains capillary axial grooves that were cut using the method of electric-discharge-machining (EDM). The general multivariable optimization methods were used to search for the optimum structure of the heat pipe. Based on the optimization results, a miniature copper-water heat pipe with external overall dimensions of 7 × 3 × 120 mm was fabricated and tested. Maximum heat transfer rates of 50 watts in the horizontal orientation and 70 watts in the vertical orientation at a working temperature of 100°C were achieved. The corresponding heat fluxes were 25 and 35 W/cm2, respectively, based on the external heating surface area. These two values are increased to 40 and 56 W/cm2 if the calculation is based on the dimensions of the vapor space. The heat transport capacity of the optimized heat pipe was increased by 66% to 100% at the working temperature of 100°C, compared to the non-optimized heat pipes. The effective thermal conductance of the heat pipe was 60 to 110 times that of a copper bar having the same overall dimensions.


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