管壳式换热器壳程特性的数值模拟研究

Numerical Simulation Research on Features in Shell Side of Shell-and-Tube Heat Exchanger

利用FLUENT软件对一管壳式换热器壳程流场进行了三维数值模拟,分析研究了折流板数目、进口流速和折流板缺口高度对换热器壳程压降、出口温度的影响,结果显示,随着折流板数目增加,壳程压降和出口温度逐渐增大;随着进口流速增大,壳程压降逐渐增大且趋势加快,而出口平均温度下降,但是温度下降不大;随着折流板缺口高度增大,壳程压降和出口平均温度逐渐减小,但是压降减小逐渐趋于缓和;相同的压降条件下,通过改变折流板数目提高出口温度比改变进口流速和折流板缺口高度更有效。

Three dimensional numerical simulations of one tube-and-shell heat exchanger were carried out by using the FLUENT software. The influences caused by the segmental baffle number, inlet flow rate and baffle nick＇s height on the pressure drop and outlet temperature of the robe-and-shell heat exchanger＇s shell side, were analyzed. The results expatiate as the segmental baffle number increases, the pressure drop and outlet temperature increase, and that as the inlet flow rate increases, the pressure drop increases with dropping tendency quickening, but the outlet temperature is dropping, and that as the segmental baffle nick＇s height inereases, the pressure drop and the outlet temperature decrease, and the pressure drop rate tends to slow down. And under the same pressure drop condition, it＇s better to change the baffle number to increase the outlet temperature than to change the inlet flow rate and baffle nick＇s height.