Numerical simulation on flow boiling heat transfer characteristics of R513A in the horizontal microfin tubes

IF 6.1 2区 工程技术 Q2 ENERGY & FUELS Applied Thermal Engineering Pub Date : 2024-11-17 DOI:10.1016/j.applthermaleng.2024.124969
Suhan Zhang , Leren Tao , Lihao Huang , Cheng Jin
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Abstract

To address the growing demand for high-efficiency heat exchangers in refrigeration, air conditioning, and heat pump systems, this study investigates the boiling heat transfer performance of R513A (an environmentally friendly azeotropic refrigerant) in horizontal microfin and smooth tubes with a 5.89 mm ID. Using 3D transient simulations, the tubes were analyzed under operating conditions of a mass flux of 50 kg/(m2·s) and a saturation temperature of 5 °C. The simulation results were validated against experimental data within a ±10 % error margin, confirming the reliability of model. At the constant mass flux, both the microfin and smooth tubes exhibited predominantly wavy-stratified flow, where surface tension dominated bubble flow. Gravity effects became more pronounced in slug, plug, and wavy-stratified flows. Structural parameters of microfin tubes, such as helical angle, fin height and number of fins, significantly affected flow boiling heat transfer. Increasing the helical angle had limited effect on enhancing boiling heat transfer performance. Microfin tube 4# (helical angle of 28°) exhibited an 11.27 % reduction in the boiling heat transfer coefficient compared to microfin tube 2#, due to the uneven distribution of liquid droplets in the vapor phase further reduced liquid film continuity and thickness. Microfin tube 5# (fin height of 0.30 mm) achieved an average mainstream velocity 1.36 times that of tube 2# (fin height of 0.17 mm), enhancing heat transfer. Conversely, microfin tube 6# with 54 fins showed local drying, negatively impacting its heat transfer efficiency. In summary, microfin tube 5# exhibited the optimal heat transfer characteristics.
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水平微鳍管内 R513A 流动沸腾传热特性的数值模拟
为了满足制冷、空调和热泵系统对高效热交换器日益增长的需求,本研究调查了 R513A(一种环保共沸制冷剂)在内径为 5.89 毫米的水平微鳍管和光滑管中的沸腾传热性能。通过三维瞬态模拟,在质量流量为 50 kg/(m2-s)和饱和温度为 5 °C 的工作条件下对管道进行了分析。模拟结果与实验数据进行了验证,误差在 ±10 % 范围内,证实了模型的可靠性。在恒定质量通量下,微鳍管和光滑管均主要呈现波浪分层流动,表面张力主导气泡流动。重力效应在蛞蝓流、塞子流和波浪分层流中更加明显。微鳍管的结构参数,如螺旋角、鳍片高度和鳍片数量,对流动沸腾传热有显著影响。增加螺旋角对提高沸腾传热性能的影响有限。与微鳍管 2#相比,微鳍管 4#(螺旋角为 28°)的沸腾传热系数降低了 11.27%,原因是气相中液滴分布不均,进一步降低了液膜的连续性和厚度。微鳍管 5#(鳍片高度为 0.30 毫米)的平均主流速度是管 2#(鳍片高度为 0.17 毫米)的 1.36 倍,从而提高了传热效果。相反,带有 54 个鳍片的微鳍管 6# 出现了局部干燥现象,对其热传导效率产生了负面影响。总之,微鳍管 5# 具有最佳的传热特性。
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来源期刊
Applied Thermal Engineering
Applied Thermal Engineering 工程技术-工程:机械
CiteScore
11.30
自引率
15.60%
发文量
1474
审稿时长
57 days
期刊介绍: Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.
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