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建立了导热基座上的三维圆柱体热源层流散热模型,考虑空气的变热物性,研究了热源半径、强度和位置以及热源和基座的热导率对当量热阻和最大热阻的影响.结果表明:当给定热源强度和热导率时,存在一个临界半径使得当量热阻和最大热阻取最大值;当量热阻和最大热阻均随热源位置从入口处向出口处移动而增加.当给定热源半径和位置时,提高热源和基座的热导率,当量热阻和最大热阻均减小;热源强度不影响当量热阻和最大热阻随半径的变化趋势.“,”The 3-D model of heat dissipation with laminar flow for the cylindrical heat source on the heat conduction base is established.Taking the temperature-dependent air properties into consideration,the influences of the radius,the strength,the location of the heat source,the thermal conductivities of the heat source and the base on the maximum thermal resistance and the equivalent thermal resistance are investigated.The results show that when the strength of the heat source and the thermal conductivities are fixed,there exists a critical radius corresponding to the maximums of equivalent thermal resistance and maximum thermal resistance;and the equivalent thermal resistance and the maximum thermal resistance all increase as the heat source moves from the inlet to the outlet.When the radius and the location of the heat source are fixed,the equivalent thermal resistance and the maximum thermal resistance can be reduced by improving the thermal conductivities of the heat source and the base,and the strength of the heat source can not change the curvilinear trends of the equivalent thermal resistance and the maximum thermal resistance along with the change of the radius.