螺旋隔板套管换热器壳程传热与压降的数值模拟  

Numerical Simulation of Heat Transfer and Pressure Drop at Shell-side of Coaxial-pipe Heat Exchanger with Helical Baffles

作　　者：肖兴 湛立智[2] 张正国[2] 高学农[2] 

机构地区：[1]广州赫尔普化工有限公司,广东广州510725 [2]华南理工大学传热强化与过程节能教育部重点实验室,广东广州510640

出　　处：《广东化工》2008年第1期46-48,55,共4页Guangdong Chemical Industry

摘　　要：以水-润滑油换热为对象,对螺旋隔板套管换热器的壳程传热与压降性能进行了实验研究与数值模拟。通过威尔逊图解法获得了管程的传热系数,并计算出了壳程的努塞尔特准数。采用Fluent软件模拟了润滑油在螺旋隔板套管换热器壳程层流流动时的流场、温度场以及传热与压降性能。结果表明,流体在螺旋隔板换热器的壳程流动均匀,在隔板附近没有返混和流动死区,但温度梯度最大。在相同雷诺常数下,壳程的努塞尔特准数和压降模拟值分别比实验值高1.3%～8%和4%～38.1%,模拟值与实验值吻合较好。The experimental study and numerical simulation on heat transfer and pressure drop characteristics were performed at the shell-side of a coaxial-pipe heat exchanger with helical baffles. Experiments were conducted for cooling water flowing in the tube side of the heat exchanger with oil as the working medium flowing in the shell side. The tube-side heat transfer coefficients were obtained using Wilson plot method, and the shell-side Nusselt numbers were predicted based on hydraulic diameter. The flow field, temperature field and heat transfer performances in the shell side were simulated using Fluent software. The results showed that the fluid flow on the shell side of helically baffled heat exchanger was a uniform velocity profile, this kind of flow pattem causes nearly backmixing and dead space at near helical baffle, but the temperature gradient was the biggest. At the same Reynolds numbers, the numerical results of the shell-side Nusselt numbers and pressure drops were 1.3%-8 % and 4%-38.1% larger than those of experimental data, respectively. The simulation results were better in accordance with the experimental data.

关 键 词：螺旋隔板 数值模拟 传热 压降 

分 类 号：TQ051.5[化学工程] TK124[动力工程及工程热物理—工程热物理]