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首页> 外文期刊>International Journal of Refrigeration >Prediction of effective friction factors for single-phase flow in horizontal microfin tubes
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Prediction of effective friction factors for single-phase flow in horizontal microfin tubes

机译：预测水平微翅片管中单相流动的有效摩擦系数

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摘要

An experimental database, covering a wide range of tube and fin geometric dimensions, Reynolds number and including data for water, R11, and ethylene glycol has been compiled for friction factor for single-phase flow in spirally grooved, horizontal microfin tubes. The tubes (21 in all) had inside diameter at the fin root between 6.46 and 24.13 mm, fin height between 0.13 and 0.47 mm, fin pitch between 0.32 and 1.15 mm, and helix angle between 17 and 45 degrees. The Reynolds number ranged from 2.0 × 10{sup}3 to 1.63 × 10{sup}5. Six earlier friction factor correlations, each based on restricted data sets, have been compared with the database as a whole. None was found to be in good agreement with all of the data. The Jensen and Vlakancic correlation was found to be the best and represents the database within ± 21%.
机译：已编写了一个实验数据库，该数据库涵盖了广泛的管和翅片几何尺寸，雷诺数，并包括水，R11和乙二醇的数据，以获取螺旋槽水平微翅片管中单相流动的摩擦系数。管（总共21根）在鳍根的内径在6.46和24.13mm之间，鳍高在0.13和0.47mm之间，鳍间距在0.32和1.15mm之间，并且螺旋角在17度和45度之间。雷诺数范围从2.0×10 {sup} 3到1.63×10 {sup} 5。六个早期的摩擦因数相关性（分别基于受限的数据集）已与整个数据库进行了比较。没有发现与所有数据高度吻合。发现Jensen和Vlakancic相关性最好，并且代表数据库的误差在±21％以内。

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