论文部分内容阅读
本文基于传统微通道热沉的物理模型,建立了完全填充、三角形填充、梯形填充、渐扩梯形填充及底层填充5种不同几何布置形态的多孔金属微通道热沉的数值模型。在层流流动的范围内,对不同布置形态多孔金属微通道热沉的阻力系数、平均Nu数、热阻、有效温控系数及能效因子等相关参数进行了数值研究,并应用场协同原理对多孔金属强化微通道的换热性能进行了分析。结果表明:微通道热沉中填充多孔金属后可显著改善速度场与温度场之间的协同性,填充不同多孔金属布置形态的微通道热沉可使平均协同角减小9.6°~23.2°左右;5种不同多孔金属布置形态的热沉中,完全填充热沉的热阻最小,冷却效果最好;等泵功情况下,当Re数大于150时,完全填充和梯形填充热沉的综合换热性能均优于传统微通道。
Based on the physical model of the traditional microchannel heat sink, a numerical model of porous metal microchannel heat sink with five different geometrical configurations of full fill, triangle fill, trapezoid fill, gradually expanding trapezoidal fill and underfill was established. In the range of laminar flow, the related parameters such as drag coefficient, average Nu number, thermal resistance, effective temperature coefficient and energy efficiency factor of porous metal microchannel heat sink with different layout are numerically studied. The heat transfer performance of porous metal reinforced microchannels was analyzed. The results show that the microchannel heat sink filled with porous metal can significantly improve the synergy between the velocity field and the temperature field. The microchannel heat sink filled with different porous metal arrangements can decrease the average synergy angle by 9.6 ° ~ 23.2 ° In the heat sink with five different patterns of porous metal, the thermal resistance of the completely filled heat sink is the smallest, and the cooling effect is the best. When the Re number is greater than 150, the full charge and the trapezoidal filled heat sink Thermal performance is better than traditional microchannels.