Analysis of Thermal Performance in a Two-phase Thermosyphon loop based on Flow Visualization and an Image Processing Technique

IF 1.7 4区工程技术 Q3 THERMODYNAMICS

Heat Transfer Research Pub Date : 2024-03-01 DOI:10.1615/heattransres.2024052009

Avinash Jacob Balihar, Arnab Karmakar, Avinash Kumar, Smriti Minj, P L John Sangso

引用次数: 0

Abstract

Thermal performance was analyzed based on flow visualization and an image processing technique in a two-phase thermosyphon loop (TPTL) with boiling water as the working fluid at low pressure. The bubble geometries, bubble frequency, and dynamic void fraction were measured using direct image analysis combined with the power spectrum and statistical analysis. At a heating rate of 400 W and a filling ratio of 0.88, the thermal performance of the TPTL was enhanced with a thermal efficiency of 91% and effective thermal conductivity of 43858.84 W m‒1 oC‒1. The enhancement was due to the higher frequency cap bubble flow of 11.2 Hz obtained by the direct flow visualization. The bigger Taylor bubbles with slug flow were examined to contribute to the negative effect on the heat transfer rate due to their film boiling regimes. The detailed analysis reveals the mechanism of bubble flow interacting with thermal performance.

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基于流动可视化和图像处理技术的两相热力虹吸环路热性能分析

基于流动可视化和图像处理技术，对低压下以沸水为工作流体的两相热流环（TPTL）中的热性能进行了分析。通过直接图像分析、功率谱分析和统计分析，测量了气泡几何形状、气泡频率和动态空隙率。在加热速率为 400 W、填充率为 0.88 的条件下，TPTL 的热效率提高了 91%，有效热导率达到 43858.84 W m-1 oC-1。热效率提高的原因是通过直接流动可视化获得了频率为 11.2 Hz 的较高帽泡流动。经研究，较大的泰勒气泡与蛞蝓流由于其膜沸腾状态而对传热率产生了负面影响。详细分析揭示了气泡流动与热性能相互作用的机理。

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

Heat Transfer Research 工程技术-热力学

CiteScore

3.10

自引率

23.50%

发文量

102

审稿时长

13.2 months

期刊介绍： Heat Transfer Research (ISSN1064-2285) presents archived theoretical, applied, and experimental papers selected globally. Selected papers from technical conference proceedings and academic laboratory reports are also published. Papers are selected and reviewed by a group of expert associate editors, guided by a distinguished advisory board, and represent the best of current work in the field. Heat Transfer Research is published under an exclusive license to Begell House, Inc., in full compliance with the International Copyright Convention. Subjects covered in Heat Transfer Research encompass the entire field of heat transfer and relevant areas of fluid dynamics, including conduction, convection and radiation, phase change phenomena including boiling and solidification, heat exchanger design and testing, heat transfer in nuclear reactors, mass transfer, geothermal heat recovery, multi-scale heat transfer, heat and mass transfer in alternative energy systems, and thermophysical properties of materials.