竖管供水阀 standpipe water su ly valve; standpipe water supply valve
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Heat transfer will worsen if structure parameters of the spring inserts are not fit . the paper think that the mechanism of heat transfer enhances of the spring inserts is the laminar flow lining is thinner because of librating of the spring inserts , accordingly the part of convection is enhanced . but the part of boil is not influenced 通过弹簧插入物的各个参数对传热性能的影响分析,认为弹簧插入物对竖管降膜蒸发传热强化的机理主要是弹簧的振动加强了液膜的湍动,减薄了层流内层,从而强化了对流传热分量,但对沸腾传热分量没有影响。
Exerting the model of two mechanism heat transfer , the formulation for heat transfer coefficient of liquid film which in smooth tube and equipped with spring inserts is given in this paper . heat transfer coefficient is presented which not only has relation to reynolds number , temperature difference , liquid characteristic , but also is greatly influenced by structure parameter of the spring inserts . experiments indicate the heat transfer coefficient of tubes equipped with spring inserts is 25 % higher than smooth tube 实验表明,传热系数和液膜雷诺数、传热温差、料液物性参数利弹簧插入物的结构参数有关,实验条件下,安装有弹簧插入物的竖管降膜蒸发液膜侧的传热系数比光管的传热系数可高达25左右,但某些结构参数的弹簧插入物会造成传热的恶化。