沿程加热式气泡泵最佳热流密度预测  

Optimal Heat Flux Prediction for a Heated Bubble Pump

作　　者：段文利 杨洪海[1] 张田田 司钰文 DUAN Wen-li;YANG Hong-hai;ZHANG Tian-tian;SI Yu-wen(College of Environmental Science and Engineering,Donghua University)

机构地区：[1]东华大学环境科学与工程学院

出　　处：《建筑热能通风空调》2020年第10期16-20,共5页Building Energy & Environment

摘　　要：气泡泵是无泵制冷循环的核心部件,热流密度是影响气泡泵运行的重要参数之一,在实际运行中与进口流量之间存在耦合关系。利用两相流理论建立三维气泡泵两流体模型,通过文献实验数据验证了本文模型的正确性。以1atm下饱和水为工质,采用CFX-19模拟研究热流密度对于出口液相表观速度的影响。结果表明出口液相表观速度随热流密度的增大先增大后减少,存在一个最佳热流密度。通过模拟不同管径和进口质量流量的气泡泵,发现最佳热流密度与进口质量流量存在二次函数关系,与管径成一次函数关系。而最小热流密度只与管径成二次函数关系。最佳、最小热流密度的预测对于气泡泵实际运行有一定的参考价值。The bubble pump is the core component of the pumpless refrigeration cycle.The heat flux density is one of the important parameters affecting the operation of the bubble pump.There is a coupling relationship between the actual flow and the inlet flow.The two-fluid model of three-dimensional bubble pump was established by two-phase flow theory.The correctness of the model was verified by literature experimental data.The saturated water of 1 atm was used as the working fluid,and the influence of heat flux on the apparent velocity of the liquid phase was studied by CFX-19 simulation.The results show that the apparent velocity of the liquid phase increases first and then decreases with the increase of heat flux density,and there is an optimal heat flux density.By simulating the bubble pump with different pipe diameters and inlet mass flow,it is found that the optimal heat flux density has a quadratic function relationship with the inlet mass flow,which is a function relationship with the pipe diameter;and the minimum heat flux density is only a quadratic function relationship with the pipe diameter.The prediction of the best and minimum heat flux has certain reference value for the actual operation of the bubble pump.

关 键 词：气泡泵 沿程加热 最佳热流密度 预测 

分 类 号：TB657[一般工业技术—制冷工程]