管壳式换热器壳侧沸腾换热模拟研究

The Simulation Study of Boiling Heat Transfer about Shell-side of the Shell-and-tube Heat Exchanger

为了研究管壳式换热器壳侧沸腾换热流动传热特点,本论文将使用Gambit软件对管壳式换热器进行划分网格等前处理,然后通过采用标准k-ε湍流模型、混合物多相流模型,编写相应的沸腾换热自定义函数UDF,用Fluent软件对其进行壳侧沸腾换热计算,得到两相流、速度和温度等分布图,结果证明壳侧流动在弓形板后面形成了换热死区,水蒸气产生主要集中于后部,并向上聚集,最后分析了对换热器结构、强度等的影响并提出了相应的改进办法,为管壳式换热器的设计和使用提供理论参考。

In order to study the heat exchange characteristic of boiling heat of the shell - and - tube heat exchanger, This paper will preproeess the shell - and - tube heat exchanger by using the gambit software to divide the grid, etc, and then, by adopting standard k -6 turbulence model and the mixture muhi- phase flow model and writing User- defined Function （UDF）, calculate the boiling heat transfer of shell - side by using fluent software to get the seattergrams of two - phase flow, speed, pressure and tem- perature, etc, the results demonstrate that shell - side flow form the heat transfer dead zone at the back of the bow - shape plate and the generation of water vapor is mainly vapolocated in the back and gathered upwards. Lastly, the paper analyzes the effects of the structure and strength of the heat exchanger and the corresponding improvement measures, which could supply references for the design and use of the shell - and- tube heat exchanger.