换热管内塑料螺旋管强化传热的三维数值模拟  

3D Numerical Simulation of Heat Transfer Inserted Tubes with Spiral Flange

作　　者：彭明哲 

机构地区：[1]中国化工株洲橡胶研究设计院有限公司,湖南株洲412000

出　　处：《广东化工》2015年第19期52-54,58,共4页Guangdong Chemical Industry

摘　　要：利用Fluent 6.2及辅助软件,对装有塑料螺旋线的换热管内流体流动及强化传热进行了计算机三维数值模拟,分析并比较了光管与有内置塑料螺旋线管的情况下管内流速、湍流度以及对流传热系数的分布改善情况,得出了流体的流动和传热特性。研究表明:螺旋通道内的流体明显的存在轴向、切向以及径向速度,且比光管的大。由于螺旋线的存在使得螺旋线管内流体的湍动程度加剧,它不仅阻止了污垢的生成,而且还有效的强化了管内的对流传热,其表面平均传热系数较光管提高了近20%左右;螺旋线管所带来的管路压降在工程容许的范围内,适用于流速低于0.8 m/s的换热器中。With the help of Fluent 6.2 and supporting software, 3D numerical simulation of fluid flow and heat transfer enhancement of plastic spiral tubes were performed on computer, and the velocity, turbulence intensity and improvement of convective heat transfer coefficient distribution in plastic spiral tubes were analyzed and compared with those in smooth tubes, and characteristics of fluid flow and heat transfer were obtained. The results showed that there were obvious axial, tangential and radial velocities in spiral space, and they were bigger than those in smooth tubes. The turbulence intensity was also increased greatly because of the existence of spiral channels. The dirt production was prevented and the tube＇s convection heat transfer was effectively strengthened. Its surface average heat transfer coefficient had been enhanced by about 20% compared with the smooth tubes; The pressure drop caused by plastic spiral flange was in the permissible range of engineering application. It was suitable for the heat exchanger at a flow velocity lower than 0.8 m/s.

关 键 词：螺旋线管 RNG k-ε模型 数值模拟 强化传热 

分 类 号：TK112[动力工程及工程热物理—热能工程]