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在圆管内层流充分发展段填充环形金属多孔介质以实现强化传热,建立了流动与传热的数学模型,并着重分析了多孔介质填充位置对管内速度、温度分布以及传热综合性能的影响。数值模拟结果表明:填充金属多孔介质的区域温度非常均匀,速度分布趋于平坦,而未填充多孔介质的区域速度及温度梯度均较大,壁面与流体之间的换热显著增强;此外,对于填充一定截面积多孔介质的圆管,为获得较高的PEC值,宜将多孔介质的填充位置靠近圆管中心。
In the circular tube, the full development of the segment lamellae to fill the annular porous metal medium to achieve the enhanced heat transfer, the mathematical model of flow and heat transfer was established, and the influence of the filling position of the porous medium on the velocity, temperature distribution and the comprehensive performance of the heat transfer was analyzed emphatically . The numerical simulation results show that the temperature of the region filled with porous metal is very uniform and the velocity distribution tends to be flat, while the velocity and temperature gradient of the unfilled porous medium are large, and the heat transfer between the wall and the fluid is significantly enhanced. In addition, Filling a certain cross-sectional area of porous media tube, in order to obtain a higher PEC value, the porous media should be filled near the center of the tube.