Aspects of Two-Phase Flow Boiling Heat Transfer inside Tube of Water Tube Boiler—A Numerical Study

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-07-17 DOI:10.1134/S1810232823020108

S. Howlader, S. Moharana, M. K. Das

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Abstract

The study of flow boiling heat transfer inside larger diameter tubes, which are used in water tube boilers, is sparse in the literature. Accordingly, the present study explore numerically saturated flow boiling phenomenon of water in a horizontal plain stainless steel tube at atmospheric condition. The effect of mass flux (254.67 kg/m²s–600.00 kg/m²s), heat flux (16.97–135.00 kW/m²), surface roughness (0.15 mm–0.5 mm), inclination angle (0°–60°) and the tube diameter (5 mm–50 mm) on the flow boiling heat transfer coefficient (HTC) and overall vapor volume fraction (VVF) is investigated. A 2D k-\(\varepsilon\) turbulence model of ANSYS-FLUENT platform is used along with the Volume of Fluid (VOF) model to track the interface between the water and vapor. The numerical findings indicate that HTC rises with a rise in mass flux and declines with a rise in heat flux. Furthermore, it is revealed that when heat flux rises, the VVF in the domain increases, corroborating the observation of a drop in HTC. The observed phenomenon is quite true for conventional tubes used in industries. An improvement in flow boiling HTC is also observed for tubes with higher surface roughness. The influence of inclination angle has substantial effect on the HTC, and the HTC rises with rise in inclination angle except for larger mass flux. The HTC of smaller tube diameter is larger compared to larger tube diameter tube, and after certain range of tube diameter (20 mm) the change in HTC is insignificant.

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水管锅炉管内两相流沸腾换热的几个方面——数值研究

对于水管锅炉用大口径管内流动沸腾换热的研究文献较少。为此，本文对常压条件下水平不锈钢管内水的饱和流动沸腾现象进行了数值模拟研究。研究了质量通量(254.67 kg/m2s ～ 600.00 kg/m2s)、热流密度(16.97 ～ 135.00 kW/m2)、表面粗糙度(0.15 mm ～ 0.5 mm)、倾角(0°～ 60°)和管径(5 mm ～ 50 mm)对流动沸腾换热系数(HTC)和总蒸汽体积分数(VVF)的影响。采用ANSYS-FLUENT平台的二维k- \(\varepsilon\)湍流模型和流体体积(VOF)模型对水蒸汽界面进行跟踪。数值结果表明，HTC随质量通量的增大而增大，随热通量的增大而减小。此外，当热通量增加时，区域内的VVF增加，证实了HTC下降的观察结果。所观察到的现象对于工业中使用的常规管是非常正确的。对于表面粗糙度较高的管，流动沸腾HTC也有改善。倾角对HTC的影响较大，除了质量通量较大外，HTC随倾角的增大而增大。较小管径的HTC比较大管径的HTC要大，在一定的管径范围(20mm)后HTC的变化不显著。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.