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Design and Experimental Study of High Performance Miniature Channel Heat Sinks

Author: JinManLi
Tutor: YangKun
School: Huazhong University of Science and Technology
Course: Engineering Thermophysics
Keywords: Microchannels Staggered Numerical Simulation Optimization Experimental study
CLC: TK124
Type: Master's thesis
Year: 2011
Downloads: 17
Quote: 0
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Abstract


In recent years, with more and more high-density electronic equipment assembly, thermal issues are becoming more prominent. Microchannel heat sink has a specific surface area, high heat transfer efficiency and compact structure, become hot research scholars. Paper, the design requirements are: in the cooling surface of 40mm × 20mm, the flux density of 20W/cm2, the wall surface of the heat sink temperature is below 60 ° C. In order to achieve this goal, this paper presents an efficient staggered fin structure tiny channels. FLUENT software performance comparison results show that the structure of heat sink the staggered structure heat sink and traditional inline staggered structure heat sink heat transfer capacity compared to the inline structure increased more than 18%, but it also brings the problem of increased resistance . In addition, from the point of view of the field synergy explain the the STAGGERED tiny channel heat sink heat transfer mechanism to strengthen and wasted work increases. Based on the numerical results of the staggered heat sink fins rounded fillet has little impact on the performance of the heat sink. Therefore, this paper does not change the shape of the fins on the basis of the impact of staggered the tiny channel heat sink fin structure parameters to do the in-depth discussion, studies have shown that there is an optimum fin length ratio: Staggered rib, the most The best fin thickness ratio, the optimum fin height ratio, so that the optimal performance of the heat sink. Analysis, the outlet tubes to the pressure drop of the heat sink, the results show that more than 50% of the total pressure drop of the pressure drop of import and export, which shows that the pressure drop of the heat sink body is much smaller than the total pressure drop. Based on optimization results, combined processing, the paper processing Four groups of staggered ribs tiny channels, in the case of the different heating power, different flow and different design dimensions, its cooling and flow testing experiments, and the experimental The results were analyzed and discussed. Found that the wall surface of the heat sink temperature and the heat flow density is a linear relationship between heating power change, the heat sink of the dynamic response in 1 minute;, heat sink, heat exchanger performance, the pressure loss also increases as the flow rate increases; experimental results show that The design dimensions of y = 1, WC = 2.1 the heat sink effect of heat transfer is preferably, which is consistent with the results of the numerical calculation. And when the flow rate was 4.17ml / s in the case of heat reaches 30W/cm2, the wall temperature of the heat sink is lower than 60 ℃, that this paper, the design of the heat sink to meet the requirement of topic. The experimental heat sink numerical simulation with the experimental results better and more layered honeycomb In this paper, the design of heat sink heat transfer performance of the heat sink times. The results and conclusions of this research has important guiding significance to the design of the heat sink of the tiny channels.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Thermal Engineering Theory > Heat Transfer
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