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首页> 外文期刊>International communications in heat and mass transfer >Experimental investigation on heat transfer enhancement of a tube with coiled-wire inserts installed with a separation from the tube wall
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Experimental investigation on heat transfer enhancement of a tube with coiled-wire inserts installed with a separation from the tube wall

机译：安装有与管壁分隔开的盘绕线插入物的管的传热的实验研究

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摘要

An experimental investigation was conducted for the thermo-hydraulic performance of a circular tube with coiled-wire inserts which were installed with a small separation from the inner wall of the tube. The wire inserts had an equilateral triangular cross-sections with a constant side length of e = 6 mm and they were coiled with three different pitch-to-diameter ratios: P/D = 1, P/D = 2, P/D = 3. A specific method was employed to coil the wires so that an edge of the triangle was oriented to face the incoming air flow. The coiled-wire inserts were installed with 1 and 2 mm separation from the inner tube wall so that the heat transfer enhancement due to the laminar boundary layer disturbance could be investigated. Experiments were performed for Reynolds numbers from 3429 to 26,663. The coiled-wire inserts led to a significant increase in both the heat transfer rate and friction factor over the smooth tube based on coil pitches and clearance. The maximum thermal performance was observed around 1.82 for the P/D = 1, s = 1 type at a Reynolds number of 3429. In conclusion, the laminar boundary layer disturbance can be effectively enhanced by using these types of coiled-wire inserts.
机译：对带有盘绕钢丝插入物的圆形管的热工液压性能进行了实验研究，该盘绕钢丝插入物与管的内壁有很小的间隔。线芯具有等边三角形横截面，其恒定边长为e = 6 mm，并以三种不同的螺距直径盘绕：P / D = 1，P / D = 2，P / D = 3.采用了一种特殊的方法来盘绕电线，以使三角形的边缘朝向面对进气流。盘绕线嵌件的安装距离内管壁1毫米和2毫米，以便研究层流边界层扰动引起的传热增强。对雷诺数从3429到26,663进行了实验。基于线圈的螺距和间隙，盘绕的线圈芯导致传热速率和光滑管上的摩擦系数都大大增加。对于雷诺数为3429的P / D = 1，s = 1型，观察到最大热性能约为1.82。总而言之，使用这些类型的线圈绕线插件可以有效地增强层流边界层扰动。

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