【摘要】 在Pr=135和雷诺数为300～3500条件下,对10种不同类型和参数的插入物进行传热及流阻实验、机理分析和性能评价,分析表明对于高粘液体传热,置换型插入物是最适宜的类型。又通过分析插入物传热和阻力特性对其效益的影响,指出以节省面积或功耗为目的时,用插入物强化传热的途径应当是尽可能提高传热系数,特别是低雷诺数下的传热系数,插入物引起的阻力增加可由降低雷诺数来补偿,最后以交叉锯齿带插入物的开发作为实例,说明上述两点结论的作用及其工业应用的可行性。更多还原

【Abstract】 Under the experimental conditions of Renolds number in the range of 300 to 3500 and prandtl number about 135, heat transfer and fluid friction experiments, enhancement mechanism and performance evaluation for ten different kinds of inserts with different parameters are carried out. The results show that the displaced promoter is the best kind of inserts to enhance heat transfer for high viscous liquids. By examining the effects of heat-transfer and friction on the benifit of using inserts, it is found that in order to save heat-transfer surface area or pumping power,the most efficient way is to use insert with heattransfer coefficient as high as possible, especially at low Renolds numbors. The problem of excessive pressure drop caused by tube inserts could be supplemented by decreasing Renolds number. Finally, the R & D of a novel insert-cross sawtooth tape"was taken as an example and the usefullness as well as the industrial feasibility of above conclusions are verified.更多还原