基于Fluent的波节管内流体流动与传热特性研究

Research on fluid flow and heat transfer performance in corrugated tubes based on Fluent

为了深入研究影响波节管传热效果的主要因素,应用CFD软件Fluent对波节管内流体的流动和传热特性进行数值模拟,分别研究了不同入口流速v(0.3,0.5,0.7和0.9 m/s)、波峰直径D1(28,30,32,34和36 mm)、弧形段长S1(34,23,17,13和10 mm)下波节管内流体的流动与传热特性。结果表明,不同型号波节管的努塞尔数(Nu)、流体压力损失以及综合性能随着入口流速的增加而增加;随着波峰直径D1(弧形段长S1)的增大,波节管的Nu先增大后减小,最后趋于一个相对稳定的值。当波节管的波峰直径D1=34 mm时,波节管的传热性能最好,流体压力损失最大,综合性能最好;弧形段长S1=23 mm时,波节管的换热性能最佳,流体压力损失最大,综合性能最好。通过参数正交分析可知,影响波节管传热效果的因素由强到弱依次为入口流速v、波峰直径D1、弧形段长S1。研究成果可为工程实际中提高波节管传热性能提供理论指导。

In order to study deeply the main factors influencing the heat transfer effect of corrugated tubes,CFD software Fluent was used to simulate the fluid flow and heat transfer performance.The flow and heat transfer performances of corrugated tubes under the conditions of different inlet velocities v(0.3 m/s,0.5 m/s,0.7 m/s,0.9 m/s),peak diameters D1(28 mm,30 mm,32 mm,34 mm,36 mm),and arc lengths S1(34 mm,23 mm,17 mm,13 mm,10 mm)were studied respectively.The results show that the Nusselt number,the pressure drop and the comprehensive performance of different types of corrugated tubes increase with the inlet velocity.The Nusselt number increases firstly and then decreases with the peak diameter D1(arc section length S1),and finally remains as a relatively stable value.The heat transfer performance of corrugated tubes is the best at the peak diameter D1 of 34 mm,and the Nusselt number is the largest at the length of arc section S1 of 23 mm.Meanwhile,the pressure drop is the largest and the comprehensive performance is the best under the two above-mentioned conditions.Through the parameter orthogonal analysis,it can be concluded that the order of the factors influencing the heat transfer effect of corrugated tubes from strong to weak is as follows:inlet velocity v,peak diameter D1,and arc length S1.This study can provide theoretical guidance for improving the heat transfer performance of corrugated tube in engineering.