分形小通道換熱器內(nèi)湍流與換熱特性數(shù)值模擬
[Abstract]:A three-dimensional model of turbulent flow and heat transfer in a tree-shaped fractal heat exchanger channel is established. The numerical simulation of flow and heat transfer in a tree-shaped channel with an inlet hydraulic diameter of 3.2 mm is carried out by using the fluid-solid coupling method. The fluid velocity and temperature distribution, pressure loss and maximum temperature difference of the surface of the heat exchanger with fractal structure are obtained in turbulent state. Under the same working conditions, the pressure loss in the channel is theoretically verified by using the Nikolaz semi-empirical formula. The calculation results show that the fractal tree channel structure has strong heat transfer ability and uniform temperature distribution due to the formation of some reflux in turbulent state, and the surface temperature difference of the heat exchanger decreases with the increase of inlet Reynolds number. The fluid inlet temperature has little effect on the surface temperature difference of the heat exchanger, and the pressure loss in the channel increases with the increase of the inlet Reynolds number, and the numerical simulation results are close to the theoretical analysis results. The results obtained by numerical simulation in this paper are accurate and reliable.
【作者單位】: 景德鎮(zhèn)陶瓷大學(xué);英業(yè)達(dá)集團(tuán);
【分類號】:TQ051.5
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