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以小型电子设备散热技术为背景,通过运用具有QUICK差分格式的SIMPLE算法,借助FORTAN语言,对小空间热源群绕体自然对流进行三维仿真模拟,分析研究腔体几何尺寸,热源几何尺寸、位置、数量等因子对换热的影响及三维特性.结果表明:随着腔体长高比率增加,换热效果先增强再减弱,高温热源的影响范围具有区域性,其范围主要集中在水平方向4倍热源宽度,垂直方向2倍热源高度;随着热源几何尺寸的增加,换热逐渐加强;当热源位置由边缘逐渐移动到中心,换热逐渐加强.在中间散热效果最好,位于边缘散热效果较差;在小Rayleigh数时,无论边界条件如何变化,方形空间的换热效果均较好;在高温热源的主要影响范围内,研究三维问题可用二维模型代替.
Based on the cooling technology of small electronic equipment, SIMULATION algorithm with QUICK difference scheme and FORTAN language are used to simulate the natural convection of small space heat source group. The geometric dimensions of cavity, heat source geometry, location, Quantity and other factors on the heat transfer and the three-dimensional characteristics were studied.The results show that the heat transfer efficiency first increases and then decreases as the cavity length-height ratio increases, and the influence range of the high-temperature heat source is of a regional nature, and its scope mainly concentrates in the horizontal direction by 4 times Heat source width, vertical 2 times the height of the heat source; as the heat source geometry increases, the heat gradually strengthened; when the heat source position gradually moved from the edge of the center, heat gradually enhanced heat dissipation in the middle of the best edge cooling effect In the case of small Rayleigh number, the effect of heat exchange in square space is good regardless of the boundary conditions. In the main influence of high temperature heat source, the study of three-dimensional problem can be replaced by two-dimensional model.