共查询到20条相似文献,搜索用时 31 毫秒
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R. Arularasan R. Velraj 《The International Journal of Advanced Manufacturing Technology》2010,51(1-4):415-419
Desktop computers have changed to accommodate increasing power, approaching 100 W. Heat dissipation becomes a significant issue in efficiency promotion and stable operation of air-cooled microelectronics and power electronics components and assemblies. Finned heat sinks are commonly used devices for enhancing heat transfer from air-cooled microelectronics and power electronics components and assemblies. The use of finned heat sinks increases the effective surface area for convective heat transfer, reducing the thermal resistance and operating temperatures in air-cooled electronics. The task of selecting the best heat sink for a particular application from the hundreds of configurations available from the various manufacturers can be a formidable task for an engineer. In a typical heat sink design, the objective is to achieve target heat dissipation, while restricting the consumption of valuable resources such as mass, fan power, pressure drop, and space claim. In this research work, preliminary studies have been carried out for the performance improvement of a parallel-plate heat sink considering the various geometric parameters, such as number of fins, fin length, fin height, and base height. The modeling and simulation of the heat sink is carried out with the computational fluid dynamics package. The results are analyzed using analysis of variance and response graphs. 相似文献
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Ali Sadollah Hadi Eskandar Joong Hoon Kim 《The International Journal of Advanced Manufacturing Technology》2014,73(5-8):795-804
The heat sinks are utilized in electronic devices to eliminate heat from the chip and efficiently transmit it to the environment. Therefore, the optimal geometry sizes of fin heat sinks are the point of concern for manufacturers and designers. For this reason, the importance of optimization techniques particularly metaheuristics is understood. The design variables are width of heat sink, number of fins, fin height, and fin diameter. The various responses that have been considered are electromagnetic emitted radiations, thermal resistance, and mass of the heat sink investigated separately and simultaneously (multi-objective). Mine blast algorithm (MBA), as a recently developed optimizer, is inspired from explosion of mines. The optimum dimensions and values for each response have been obtained by the MBA and have been compared with other optimization methods in the literature. In terms of thermal resistance and mass responses, the MBA has offered better values, while for the emitted radiations, the obtained results obtained by Taguchi-based gray relational analysis (TGRA) was preferred. For manufacturing point of view, the MBA and TGRA both suggested better and efficient design. In addition, the value path analysis has been carried out to compare the trade-off among the considered responses. Finally, parametric sensitivity analyses have been implemented for design parameters, and discussions and comparisons have been carried out for the effects of each decision variable. By considering all responses, width of heat sink and fin height are considered as the most important and effective design parameters, respectively. 相似文献
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为提高水冷盘式制动器散热性能,基于强化对流传热原理,通过添加扰流柱对制动器散热结构进行优化,设计了4种扰流柱散热结构,运用CFD方法模拟制动盘流固耦合传热过程,采用Fluent软件进行热流固耦合仿真计算,获得制动盘温度特性和换热特性以及流动阻力特性,并使用综合性能评价因子对不同扰流柱散热结构进行评价。结果表明:通过在安装盘水槽内添加扰流柱可以有效地提高水冷盘式制动器的散热效果;在相同的工作条件下,正三角形扰流柱散热结构的盘面温度最低,平均努塞尔数与流动阻力最高,其综合散热性能较圆形、椭圆形以及水滴形扰流柱散热结构分别提高了3.4%,2.4%和4.4%,较无扰流柱散热结构提高了6.7%,正三角形扰流柱散热结构具有更好的综合散热性能。研究结果为水冷盘式制动器散热结构的优化设计提供了参考。 相似文献
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大容量电力电子装置中板式水冷散热器的优化设计 总被引:1,自引:2,他引:1
为提高水冷散热器的散热能力、控制其温度均匀性,在散热器外形尺寸及流量一定的条件下,从理论上对层流范围内平板式水冷散热器的三个通道参数(通道数、散热片高度、散热片占空比)与散热器量纲一散热热阻的变化关系进行了推导。提出可根据这些变化关系来对任意尺寸平板式水冷散热器的各通道参数进行优化选择,在工程设计上具有很好的指导意义,仿真和试验结果证明了方法的有效性并表明:小通道尺寸的平板式水冷散热器对于解决大热流密度器件的散热更为有效,散热效率更高;在同样的参数情况下,流量增大则散热器效率降低,应综合考虑散热器流阻和流体平均温升的控制要求来选择流量。 相似文献
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矩形翅片椭圆管热交换器流动和换热特性的数值模拟 总被引:8,自引:0,他引:8
利用CFD计算方法,对矩形翅片椭圆管热交换器进行了数值模拟,得到其在不同风速下的流动和换热特性,并就椭圆管和圆管之间阻力与换热特性进行了计算比较,分析讨论了片距及管排数对阻力特性的影响,为风洞热交换器设计提供依据。 相似文献
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在恒定泵功0.05 W条件下,对水冷铜基和铝基微通道热沉对流换热进行详细数值模拟和结构优化。通过将数值预测结果与前人已发表的试验结果进行对比,验证所使用的数值模型的正确性。同时讨论在恒定泵功下微通道几何结构对微通道热沉中温度分布的影响。模拟结果显示水冷铜基微通道热沉最优的几何结构参数为通道深为580μm,通道宽为90μm,通道密度为100个/cm;铝基微通道热沉最优的几何结构参数为通道深为620μm,通道宽为80μm,通道密度为100个/cm。 相似文献
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Yong H Kim Woo Chong Chun Jin Taek Kim Bock Choon Pak Byoung Joon Baek 《Journal of Mechanical Science and Technology》1998,12(4):709-718
A study of manifold microchannel (MMC) heat sinks for forced air cooling was performed experimentally. The manifold microchannel
heat sink differs from a traditional microchannel (TMC) heat sink in that the flow length is greatly reduced to a small fraction
of the total length of the heat sink. In other words, the MMC heat sink features many inlet and outlet channels, alternating
at a periodic distance along the length of the microchannels while the TMC heat sink features one inlet and one outlet channels.
The present study primarily focused to investigate the effects of geometrical parameters on the thermal performance of the
manifold microchannel heat sinks for optimal design. Also, the thermal resistances of the MMC heat sinks were compared with
those of the TMC heat sinks. Experimental results showed the thermal resistances of MMC heat sinks were affected strongly
by the pumping power, the microchannel width and the manifold inlet/outlet channel width, but weakly by the microchannel thickness-width
ratio and the microchannel depth coorporated with the manifold inlet/outlet channel width. However, it was found that there
existed the optimum values of the latter parameters. Under the optimum condition of geometrical parameters in the present
study, the thermal resistance of the MMC heat sink was approximately 35% lower than that of a TMC heat sink, which clearly
demonstrated the effectiveness of using a manifold. 相似文献
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In this study the optimization of plate-fin type heat sink with vortex generator for the thermal stability is performed numerically.
The optimum solutions in the heat sink are obtained when the temperature rise and the pressure drop are minimized simultaneously.
Thermal performance of heat sink is influenced by the heat sink shape such as the base-part fin width, lower-part fin width,
and basement thickness. To acquire the optimal design variables automatically, CFD and mathematical optimization are integrated.
The flow and thermal fields are predicted using the finite volume method. The optimization is carried out by means of the
sequential quadratic programming (SQP) method which is widely used for the constrained nonlinear optimization problem. The
results show that the optimal design variables are as follows ; B1=2.584 mm, B2=1.741 mm, and t=7.914 mm when the temperature rise is less than 40 K. Comparing with the initial design, the temperature
rise is reduced by 4.2 K, while the pressure drop is increased by 9.43 Pa. The relationship between the pressure drop and
the temperature rise is also presented to select the heat sink shape for the designers. 相似文献
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NVIDIA JETSON TX2高功率系统芯片的散热功率一般在25 W左右,一般的风扇与肋片式散热器组合的散热方式存在体积大、高度高、不方便整合在小型系统中等问题,而热管、风扇、铜鳍片散热器组合的散热方式具有高度低、体积小、传热效率高等优点。文中首先对热管模块进行结构设计;然后对热管模块设计的合理性进行计算验证,并利用ANSYS Icepak对热管模块进行热稳态仿真,发现主要芯片的温度都在要求范围内,表明设计合理;最后将热管模块装入系统进行温度测试。结果表明,主要芯片的计算、仿真与实验的温度基本一致。 相似文献
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CPU散热器结构设计与热分析 总被引:5,自引:0,他引:5
CPU散热器是将CPU核心热量迅速导出的关键,已成为获得新一代电子芯片的主要问题之一。采用数值模拟方法对放射状太阳花CPU散热器进行三维流场及温度场分析,探讨放射状散热器在不同的肋片形状、肋片数N和肋片厚度等各种不同的参数作用下,对于整体散热器散热和流动性能的变化与影响,同时分析了太阳花散热器自然对流和瞬时动态特性。 相似文献
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Hossein Shokouhmand Shoeib Mahjoub Mohammad Reza Salimpour 《Journal of Mechanical Science and Technology》2014,28(6):2385-2391
The present study documents the constructal design and optimization of finned tubes used in air-cooled heat exchangers. The considered tubes are equipped with annular fins. The aim is to minimize the overall thermal resistance by morphing the geometry. The geometrical and thermo-physical parameters considered are the number of fins, ratio of fin height to tube diameter, Stanton number, ratio of fin conductivity to air conductivity, ratio of in-tube fluid conductivity to air conductivity and dimensionless pressure drop. Two constraints are applied in the optimization process: fixed overall volume of heat exchanger and fixed volume fraction of fin material. It is found that there exist optimal values for the number and the height of fins. Moreover, the optimal heat transfer has an extremum in a special volume fraction of fin material. 相似文献
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Fourier and hyperbolic models of heat transfer on a fin that is subjected to a periodic boundary condition are solved analytically.
The differential equation in Fourier and non-Fourier models is solved by the Laplace transform method. The temperature distribution
on the fin is obtained using the residual theorem in a complex plan for the inverse Laplace transform method. The thermal
shock is generated at the base of the fin, which moves toward the tip of the fin and is reflected from the tip. The current
study of various parameters on the thermal shock location shows that relaxation time has a great influence on the temperature
distribution on the fin. An unsteady boundary condition in the base fin caused the shock, which is generated continuously
from the base and has interacted with the other reflected thermal shocks. Results of the current study show that the hyperbolic
heat conduction equation can violate the second thermodynamic law under some unsteady boundary conditions. 相似文献
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H形鳍片管传热性能的三维数值模拟计算 总被引:1,自引:0,他引:1
建立了H形鳍片管的三维物理模型,对鳍片管传热机理进行分析.利用大型通用有限元分析软件ANSYS的FLOTRAN模块,建立了热流耦合的有限元模型,对鳍片管的稳态传热过程进行了数值计算,得到了鳍片管内、外流体的温度场分布.在对鳍片高度和鳍片间距进行调整的基础上分析了高度和间距对换热效率的影响,提出了在此边界条件下对鳍片管优化的方案. 相似文献