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首页> 外文期刊>International Journal of Heat and Mass Transfer >Advanced boiling heat transfer model for a horizontal tube with numerical analysis of bubble behaviours
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Advanced boiling heat transfer model for a horizontal tube with numerical analysis of bubble behaviours

机译：用于水平管的高级沸腾传热模型，泡沫行为数值分析

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摘要

The boiling heat transfer model for a horizontal tube is developed herein, with numerical investigations to realistically simulate bubble nucleation site distributions and bubble behaviours. Accordingly, a new heat partitioning model was proposed to reflect the bubble sliding phenomena more realistically than the extant heat partitioning models for horizontal tubes. The bubble trajectories, merging, lift-off, and distribution of nucleation sites were numerically analysed based on the force balance model, bubble tracking method, and Latin-hypercube sampling. The proposed approach can overcome the limitations of the arithmetic heat partitioning model, which does not reflect bubble mergers and the random nature of the nucleation site distribution. Distinctive bubble behaviours on a horizontal tube can be reproduced by the present model, including bubble sliding, departure, lift-off, and merger. The numerical model presented here considers bubble sliding based on a mechanistic force balance model and bubble merger based on the bubble tracking method. The Monte Carlo method was applied to determine the spatial distribution of the nucleation sites, and statistical information on the wall heat transfer and contribution of each heat transfer mechanism were obtained via extensive calculations. The method developed herein was applied to evaluate the wall heat transfer in horizontal heaters. Further, the proposed numerical boiling heat transfer model was validated against an extant experimental database of horizontal heat exchanger tubes, and the model was observed to predict the wall heat flux with satisfactory accuracy.
机译：本文开发了水平管的沸腾传热模型，具有数值研究，用于现实地模拟泡沫成核点分布和泡沫行为。因此，提出了一种新的热分配模型，以比水平管的远端热分配模型更现实地反映气泡滑动现象。基于力平衡模型，泡沫跟踪方法和拉丁 - 超立体取样进行了数值分析了气泡轨迹，合并，剥离和成核位点的分布。所提出的方法可以克服算术热分配模型的局限性，其不反映泡沫分配和成核点分布的随机性。卧式管上的独特泡沫行为可以通过本模型再现，包括泡沫滑动，出发，剥离和合并。这里提出的数值模型认为基于机械力平衡模型和基于气泡跟踪方法的气泡合并的泡沫滑动。蒙特卡罗方法被应用于确定成核位置的空间分布，并通过广泛的计算获得了对壁传热和每个传热机制的贡献的统计信息。本文开发的方法应用于评估水平加热器中的壁传热。此外，验证了所提出的数值沸腾传热模型，用于防止水平热交换器管的远端实验数据库，并且观察模型以预测壁热通量以满意的精度。

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