双套管双管板换热器流动及传热性能数值模拟

采用CFD软件方法,研究双套管双管板换热器传热及流动特性.对隔绝腔连同内外套管的环形间隙内分别充入空气、水、甲苯气体和氩气4种介质进行模拟.结果表明:不同介质对传热有不同影响,充入水时的换热效果最好,甲苯气体的最差；壳程介质在流体接管进、出口附近存在回流和绕流且速度较小,管程介质流动较为均匀,受壁面边界层影响,速度在管...

Numerical simulation of flow and heat transfer in double tube-double tubesheet heat exchanger

Heat transfer and flow behavior of double tube-double tubesheet heat exchanger were studied by CFD method.The simulation of heat transfer was performed by filling the safety chamber and the annular gap between inside and outside tubes with four different media including air,water,toluene gas and argon.The result shows that different media lead to different heat transfer results.Among which water has the best effect for heat transfer,while toluene is the worst.Backflow and around flow exist in both inlet and outlet pipe nozzles of shell side,and the fluid in tube side is well-distributed.Because of the wall boundary layer effects,the velocity is higher at the center but is lower near the wall.Different Reynolds number results in different overall heat transfer coefficients.Compared with the theoretical formula results,the simulation results are better by 15%-30%.The existing formula of overall heat transfer coefficient is not suitable for double tube-double tubesheet heat exchanger.The optimization of conventional calculation by simulating and experimental method is the focal task in the future.