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以等温容器截面为研究对象,基于多孔介质模型,采用变密度填充容器,强化中心向容器壁的导热。首先,基于稳态导热最小化热阻模型,确定了变密度铜丝2层和3层填充方案。其次,按确定的分层填充方案搭建实验台并测定容器有效导热系数,与均匀填充相比,导热系数分别增大了52.9%和77.9%。最后,对变密度填充下的瞬态导热进行了数值模拟研究,在中心温度200℃和中心热功率恒定两种情况下,经过一定时间热传导,变密度填充缩小了容器中心到容器壁的温度差。以上研究结果表明基于最小热阻的分层变密度填充铜丝可以强化由中心向周围的导热。
Taking the isothermal container section as the research object, based on the porous media model, the container is filled with variable density to enhance the thermal conductivity of the center to the container wall. First, based on the steady-state thermal conductivity minimization thermal resistance model, the variable density copper wire 2-layer and 3-layer filling schemes were determined. Secondly, according to the determined layered filling scheme, the experimental set-up and the effective thermal conductivity of the container were determined. Compared with the uniform filling, the thermal conductivity increased by 52.9% and 77.9% respectively. Finally, the transient heat transfer under variable density filling was numerically simulated. Under the conditions of central temperature 200 ℃ and central thermal power constant, after a certain period of heat conduction and variable density filling, the temperature difference between the container center and the container wall was reduced . The above results show that stratified densification filled copper wire based on minimum thermal resistance can enhance the thermal conduction from the center to the periphery.