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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Modeling and experimental study of nucleate boiling on a vertical array of horizontal plain tubes
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Modeling and experimental study of nucleate boiling on a vertical array of horizontal plain tubes

机译：水平平管垂直阵列上核沸腾的建模和实验研究

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摘要

An investigation of nucleate boiling on a vertical array of horizontal plain tubes is presented in this paper. Experiments were performed with refrigerant RI 23 at reduced pressures varying from 0.022 to 0.64, tube pitch to diameter ratios of 1.32, 1.53 and 2.00, and heat fluxes from 0.5 to 40 kW/m(2). Brass tubes with external diameters of 19.05 mm and average roughness of 0.12 mu m were used in the experiments. The effect of the tube spacing on the local heat transfer coefficient along the tube array was negligible within the present range of experimental conditions. For partial nucleate boiling, characterized by low heat fluxes, and low reduced pressures, the tube positioning shows a remarkable effect on the heat transfer coefficient. Based on these data, a general correlation for the prediction of the nucleate boiling heat transfer coefficient on a vertical array of horizontal tubes under flooded conditions was proposed. According to this correlation, the ratio between the heat transfer coefficients of a given tube and the lowest tube in the array depends only on the tube row number, the reduced pressure and the heat flux. By using the proposed correlation, most of the experimental heat transfer coefficients obtained in the present study were predicted within +/- 15%. The new correlation compares reasonably well with independent data from the literature. (C) 2008 Elsevier Inc. All rights reserved.
机译：本文研究了水平水平管的垂直阵列上的核沸腾现象。实验使用的制冷剂RI 23的减压压力范围为0.022至0.64，管距与直径的比为1.32、1.53和2.00，热通量为0.5至40 kW / m（2）。实验中使用的外径为19.05 mm，平均粗糙度为0.12μm的黄铜管。在当前的实验条件范围内，管间距对沿管阵列的局部传热系数的影响可忽略不计。对于以低热通量和低减压为特征的部分核沸腾，管的位置显示出对传热系数的显着影响。基于这些数据，提出了在淹没条件下水平管垂直阵列上预测核沸腾传热系数的一般相关性。根据这种相关性，给定管与阵列中最低管的传热系数之比仅取决于管排数，减压和热通量。通过使用提出的相关性，在本研究中获得的大多数实验传热系数预计在+/- 15％之内。新的相关性可以很好地与文献中的独立数据进行比较。 （C）2008 Elsevier Inc.保留所有权利。

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