等温容器内多孔介质强化导热研究

等温容器是在充放气过程中容器内温度基本保持不变的一种特殊容器,在气动系统中有着广泛的应用.为强化放气过程中容器壁向内部的导热,以容器截面为研究对象,对内部铜丝的分布进行了探讨.在细铜丝填充密度一定的情况下,基于多孔介质模型,以容器截面导热热阻最小为目标,优化出两层和三层变密度填充下金属丝的分布.其热阻与均匀填充时相比,分别减少了37.63%和43.70%.研究结果表明,通过改变等温容器内细铜丝的分布可以强化容器壁向内部的导热.

Study on enhancement of heat transfer in porous media in isothermal chambers

The isothermal chamber is a special container which is widely applied in the pneumatic system. The temperature in the chamber remains unchanged during charging and discharging. In order to enhance the heat conduction from the wall to the inside of the chamber during discharging, the distribution of thin copper wires on the chamber cross section was studied. Based on the porous media model, optimization work was carried out at a certain filling density of thin copper wire to obtain the two layer and three layer variable densities of copper wires distribution for a minimum thermal resistance of the container cross section.Compared with the case of uniform filling, the thermal resistance decreased by 37.63% and 43.70%, respectively. The results of the study showed that the heat conduction from the wall to the inside of the chamber can be enhanced by changing the distribution of thin copper wires in the isothermal chamber.