多孔介质模型在散热器数值模拟中的应用

Application of porous media model in numerical simulation of radiator

散热器作为最常见的采暖设备之一,对其流体流动与传热的研究具有重要意义。采用计算流体力学提供的多孔介质模型,对散热器的传热和流动特性进行数值模拟,通过采用不同的孔隙率,研究得出具有更好的传热性能和换热效果的模型。研究结果表明,添加多孔介质之后,供暖热水出口处流速明显减低;当孔隙率为0.7时,散热器壁面的温度有明显提升,满足了人体热舒适性需求,并节约了能耗;且其壁面区域温差并不太大,为2.06°,避免了传统暖气片“上热下凉”现象。

As one of the most common heating equipment, radiator is of great significance to the study of fluid flow and heat transfer. The heat transfer and flow characteristics of heat sink are numerically simulated by using the porous media model provided by computational fluid mechanics. By adopting different porosity, the model with better heat transfer performance and effect is obtained. The results show that the flow rate at the outlet of heating hot water decreases obviously after adding porous media. When the porosity is 0.7,the temperature of the radiator wall surface has a significant increase, so as to meet the requirements of human thermal comfort and save energy consumption. There is a temperature gradient on the wall area of the radiator, but the temperature difference is not too large, especially when the porosity is 0.7,the upper and lower temperature difference is lower than the temperature difference of ε=1.0,which could solve the traditional radiator "hot on the top and cool on the bottom" phenomenon.