【摘要】 为解决管壳式换热器传热效率低下的问题,以最典型的列管式换热器为研究对象,建立换热管内置转子组合式强化传热装置的三维模型,模拟换热管内流场、温度场、压力场以及换热过程,得到管内流体的流动规律和传热性能的计算结果.模拟计算结果显示,内置转子组合式强化传热装置的换热管内尤其是近壁区域有较强的湍流度;转子与管壁之间缝隙内的流体有明显的螺旋环绕流动,可显著提高传热系数,并具有自清洁作用.研究表明,利用CAE手段解决热交换过程的瓶颈问题,可大幅度提高能源利用效率,为实现节能减排的战略目标作出贡献.更多还原

【Abstract】 Focused on the low heat transfer efficiency of shell and tube heat exchanger,the tubular heat exchangers as the most typical heat exchangers are taken as the study object. A 3D model of concentric tubes inserted with rotors-assembled strand is built. Then the flow field,temperature field,pressure field,and process of heat exchange are simulated and the flow laws of the fluid and heat transfer performance in the tube are obtained. The simulation results indicate that there is stronger turbulence intensity in the tubes inserted with rotors-assembled strand,especially in the near-wall region. The liquid between rotors and tube wall which flows in an obvious spiral way can result in notable enhancement of heat transfer coefficient with self-cleaning effect. By means of CAE,solving the bottleneck problem of heat transfer will improve the energy utilization efficiency hugely and make a contribution to achieve the strategic target of energy saving and emission reduction.更多还原