高温热管翅强化管内换热的数值模拟

将高温热管翅作为翅片强化换热的设备,可以大大地提高换热器的传热能力。为预测高温热管翅强化传热性能,推动高温热管翅的开发与应用,将12根高温热管翅的冷凝段排成2排置于管道内组成换热设备。运用FLUENT软件,选用TGrid网格技术方法、k-ε湍流模型、SIMPLE压力-速度耦合方法对该换热设备进行数值模拟计算。数值模拟结果直观地表征了高温热管翅强化管内换热的温度场、速度场以及对流换热系数场;表明管道换热设备内因为有了高温热管翅,流动速度加大,表面换热能力加强。第1排热管翅的换热系数高于第2排热管翅的换热系数。随流量的增加,对流换热系数增大。数值计算结果与实验结果进行比较,表明理论值与实验值的基本趋势相吻合。

NUMERICAL SIMULATION ON HEAT TRANSFER ENHANCEMENT OF THE HIGH TEMPERATURE HEAT PIPE FIN

The high temperature heat pipe fin can be used to heat transfer enhancement of equipment with fins.Its heat transfer capability is obviously improved.In order to investigate its heat transfer enhancement performance and develop its industry application,a heat exchanger was set up which was composed of twelve high temperature heat pipe fins arranged in two rows.The numerical simulation of flow and heat transfer in this exchanger was made by using of FLUENT software,TGrid mesh technology,the turbulence model and pressure-velocity coupled SIMPLE method.The contour of the temperature,velocity and surface heat transfer coefficient were straightly characterized by the result of numerical simulation.It is shown that the surface heat transfer coefficient on the section with the heat pipe fins in the heat exchanger is obviously improved,the heat transfer coefficient of the first row of the high temperature heat pipe fin is larger than that of the second row's and the heat transfer coefficients increase with the increasing of the flow velocity.In comparison with the experimental values,the result of numerical calculation approximately agrees with the experimental one.