共查询到19条相似文献,搜索用时 474 毫秒
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大功率LED路灯散热器自然对流的数值研究 总被引:3,自引:0,他引:3
采用CFD软件对常规型大功率LED路灯散热器建立了三维数值模型,在大空间中进行了耦合数值传热计算,并用实验验证了数值计算的可靠性。研究了自然对流散热过程中散热器的温度场和周围扰流空气的速度矢量场分布。针对散热器散热过程中,扰流空气不能进入散热器肋片中间让肋片充分发挥自然对流冷却效果,提出了一种新的结构设计,通过数值计算得到了较理想的结构。在同等功率下散热器基板底面最高温度比原模型低了5℃,肋片平均换热系数提高了17.6%,显著提高了大功率LED路灯散热器的散热能力。 相似文献
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CPU散热器热分析与优化设计 总被引:4,自引:0,他引:4
利用CFD方法分析了平板直肋片散热器特性,通过多元线性回归建立了散热器换热和流动准则关系式,提供了散热器热阻和熵产率具体表达式;结合熵特性以本文提出的准则关系式采用约束条件的遗传优化算法对散热器结构进行多参数优化,优化结果与特性分析结论和相关文献吻合。 相似文献
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高温环境下工作的封装有相变材料的热沉,一方面利用固液相变潜热存储系统吸收电子器件散发的热量,另一方面还要吸收从高温环境传递过来的热量。热沉结构的几何外形是影响上述两个热量传递的关键因素。以热沉总体尺寸、边界条件、热沉和相变材料为约束条件,热沉基部最高温度到达临界温度的最大时间为优化目标,通过数值模拟,获得了热沉翅片高度和宽度、热沉基部宽度和厚度的优化值,优化值兼顾了热沉传热效率和蓄热能力两个方面,并对优化过程中的热沉进行了传热分析。 相似文献
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Bahadur R. Bar-Cohen A. 《Components and Packaging Technologies, IEEE Transactions on》2005,28(2):238-246
The design and optimization methodology of a thermally conductive polyphenylene sulphide (PPS) polymer staggered pin fin heat sink, for an advanced natural convection cooled microprocessor application, are described using existing analytical equations. The geometric dependence of heat dissipation and the relationships between the pin fin height, pin diameter, horizontal spacing, and pin fin density for a fixed base area and excess temperature are discussed. Experimental results of a pin finned thermally conductive PPS heat sink in natural convection indicate substantially high thermal performance. Numerical results substantiate analytical modeling results for heat sinks within the Aihara et al. fin density range. The cooling rates and coefficient of thermal performance, COP/sub T/, that relates cooling capability to the energy invested in the formation of the heat sink, has been determined for such heat sinks and compared with conventional aluminum heat sinks. 相似文献
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Srisomporn S. Bureerat S. 《Components and Packaging Technologies, IEEE Transactions on》2008,31(2):351-360
The work in this paper is aimed at demonstrating the practical multiobjective optimization of plate-fin heat sinks and the superiority of using a combined response surface method and multiobjective evolutionary optimizer over solely using the evolutionary optimizer. The design problem assigned is to minimize a heat sink junction temperature and fan pumping power. Design variables determine a heat sink geometry and inlet air velocity. Design constraints are given in such a way that the maximum and minimum fin heights are properly limited. Function evaluation is carried out by using finite volume analysis software. Two multiobjective evolutionary optimization strategies, real-code strength Pareto evolutionary algorithm with and without the use of a response surface technique, are implemented to explore the Pareto optimal front. The optimum results obtained from both design approaches are compared and discussed. It is illustrated that the multiobjective evolutionary technique is a powerful tool for the multiobjective design of electronic air-cooled heat sinks. With the same design conditions and an equal number of function evaluations, the multiobjective optimizer in association with the response surface technique totally outperforms the other. The design parameters affecting the diversity of the Pareto front include fin thickness, fin height distribution, and inlet air velocity while the plate base thickness and the total number of fins of the non-dominated solutions tend to approach certain values. 相似文献
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Culham J.R. Muzychka Y.S. 《Components and Packaging Technologies, IEEE Transactions on》2001,24(2):159-165
The specification and design of heat sinks for electronic applications is not easily accomplished through the use of conventional thermal analysis tools because “optimized” geometric and boundary conditions are not known a priori. A procedure is presented that allows the simultaneous optimization of heat sink design parameters based on a minimization of the entropy generation associated with heat transfer and fluid friction. All relevant design parameters for plate fin heat sinks, including geometric parameters, heat dissipation, material properties and flow conditions can be simultaneously optimized to characterize a heat sink that minimizes entropy generation and in turn results in a minimum operating temperature. In addition, a novel approach for incorporating forced convection through the specification of a fan curve is integrated into the optimization procedure, providing a link between optimized design parameters and the system operating point. Examples are presented that demonstrate the robust nature of the model for conditions typically found in electronic applications. The model is shown to converge to a unique solution that gives the optimized design conditions for the imposed problem constraints 相似文献
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散热器的电磁辐射和散热特性分析 总被引:1,自引:0,他引:1
利用Feko软件分析对比了两种集成电路散热器的电磁辐射特性,再用Flotherm软件分析了它们的散热特性。结果表明,散热器在某些频率产生较大辐射,针状散热器的辐射与片状散热器,在一定频率范围内差别不大,但针状散热器散热性能要好于片状散热器。 相似文献
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Shah A. Sammakia B.G. Srihari H. Ramakrishna K. 《Components and Packaging Technologies, IEEE Transactions on》2004,27(4):710-717
This paper presents the results of a numerical analysis of the performance of an impingement heat sink designed for use with a specific blower as a single unit. These self-contained heat sink/blower units, which cause impingement type flow on the heat sink fins, are now commonly used for desktop microprocessors. One of the objectives of this study is to examine the effect of the shape of the heat sink fins, particularly near the center of the heat sink, on the thermal performance of the package. The pressure gradient at the center of the heat sink, near the base, tends to be high. It significantly reduces the airflow, and hence, transport in that region. Different fin shapes and airflow rates have been studied with the objective of searching for an optimal heat sink design that would improve the thermal performance without increasing the pressure drop across the heat sink. Parallel plate fins have been studied by removing fin material from the region near the center of the heat sink along the length and height of the fins. Seventeen different designs have been compared, and an "optimum" heat sink shape is reported that results in a lower operating temperature and pressure drop. It is found that removal of fin material from the central region of the heat sink enhances the thermal as well as hydraulic performance of the heat sink. 相似文献
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Krishnan S. Garimella S.V. Kang S.S. 《Components and Packaging Technologies, IEEE Transactions on》2005,28(2):281-289
A hybrid heat sink concept which combines passive and active cooling approaches is proposed. The hybrid heat sink is essentially a plate fin heat sink with the tip immersed in a phase change material (PCM). The exposed area of the fins dissipates heat during periods when high convective cooling is available. When the air cooling is reduced, the heat is absorbed by the PCM. The governing conservation equations are solved using a finite-volume method on orthogonal, rectangular grids. An enthalpy method is used for modeling the melting/re-solidification phenomena. Results from the analysis elucidate the thermal performance of these hybrid heat sinks. The improved performance of the hybrid heat sink compared to a finned heat sink (without a PCM) under identical conditions, is quantified. In order to reduce the computational time and aid in preliminary design, a one-dimensional fin equation is formulated which accounts for the simultaneous convective heat transfer from the finned surface and melting of the PCM at the tip. The influence of the location, amount, and type of PCM, as well as the fin thickness on the thermal performance of the hybrid heat sink is investigated. Simple guidelines are developed for preliminary design of these heat sinks. 相似文献