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NUMERICAL ANALYSIS OF FLOW AND HEAT TRANSFER CHARACTERISTICS OF Y-FRACTAL-LINK MICRO CHANNEL NETRWORKS

DOI: 10.1615/ICHMT.2008.CHT.480
16 pages

Guoqiang Xu
National Key Laboratory of Science and Technology on Aero-Engines, School of Jet Propulsion, Beihang University, Beijing, 100191, China; School of Energy Science and Engineering, Harbin institute of Technology, Harbin, 150001, China

Meng Wang
National Key Lab. On Aero-Engines, School of Jet Propulsion, Beihang University, Beijing, 100083, P.R. China

Zhi Tao
National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics The Collaborative Innovation Center for Advanced Aero-Engine of China Beihang University Beijing 100191, China

Shuiting Ding
National Key Lab. On Aero-Engines, School of Jet Propulsion, Beihang University, Beijing, 100083, P.R. China

Hongwei Wu
National Key Lab. On Aero-Engines, School of Jet Propulsion, Beihang University, Beijing, 100083, P.R. China

Jun Guo
National Key Lab. On Aero-Engines, School of Jet Propulsion, Beihang University, Beijing, 100083, P.R. China

Résumé

A new fractal cooling structure, Y-fractal-link micro channel networks, is proposed to improve the flow and heat transfer characteristics of the micro channel flow path in heat sink. A three-dimensional finite-volume method is employed to simultaneously solve the governing equations for continuity, momentum and energy conservation, and the non-conformal mesh technique is applied. In the numerical computations, a constant heat flux is used as a boundary condition of the top wall of chip and the flow is assumed to be laminar and fully developed. Compared with the straight parallel and traditional fractal-link micro channel networks, the detailed temperature and pressure distributions of the Y-fractal-link micro channel networks are presented. Furthermore, the optimization of this new structure is discussed with some important parameters, such as the number of branching levels, the bifurcation angle and the number of branches at each level. Numerical results reveal that the Y-fractal-link micro channel networks could significantly improve the integrated performance of heat sink. The pressure drop through the micro channel of this new structure decreases obviously when compared with that of conventional channels. In addition, the new networks present more uniform temperature distribution and relative lower maximum surface temperature than that of conventional networks. Results also show that the optimized structure of Y-fractal-link micro channel networks could remarkably enhance heat transfer and decrease pumping power.

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