Experimental analysis on the flow patterns and conversion mechanisms of condensing flow with non-azeotropic mixtures in spiral tube

IF 2.8 2区工程技术 Q2 ENGINEERING, MECHANICAL Experimental Thermal and Fluid Science Pub Date : 2024-06-11 DOI:10.1016/j.expthermflusci.2024.111245

Zhongyun Tian , Wenke Zheng , Jiwei Guo , Yaolong Wang , Lei Wang , Jie Chen , Yiqiang Jiang

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Abstract

The flow patterns have a significant impact on the flow and heat transfer characteristics of the working fluid, making it fundamental for the study of complex two-phase flows. To investigate the condensation flow pattern and flow pattern transformation mechanism with mixed hydrocarbon in a spiral tube, a two-phase flow pattern experimental system was designed. The effects of mass flux (196–540 kg/m⁻²·s⁻¹), vapor quality (0–1), and operating pressure (2–4 MPa) on flow patterns of methane/ethane/propane/isobutane mixed fluid in spiral tubes were analyzed. The results showed that with the increase in vapor quality, flow patterns such as bubbly flow, intermittent flow, wavy-stratified flow, and annular flow were observed in sequence. Additionally, through a comparative analysis of the experimental observations with existing flow pattern maps, a new flow pattern map tailored for the condensation two-phase flow of mixed hydrocarbon working fluids has been established. Based on the influence of inertial force, surface tension, gravity, shear force and other forces, Martinelli number, Soliman We and Soliman Fr are selected for the development of flow pattern conversion criteria. The new flow pattern map accurately predicts the majority of flow patterns.

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螺旋管内非各向同性混合物冷凝流的流动模式和转换机制的实验分析

流态对工作流体的流动和传热特性有重要影响，因此是研究复杂两相流的基础。为了研究混合碳氢化合物在螺旋管中的冷凝流型和流型转化机制，设计了一个两相流型实验系统。分析了质量通量（196-540 kg/m-2-s-1）、蒸汽质量（0-1）和工作压力（2-4 MPa）对甲烷/乙烷/丙烷/异丁烷混合流体在螺旋管中流动模式的影响。结果表明，随着蒸汽质量的增加，依次出现了气泡流、间歇流、波浪分层流和环形流等流动模式。此外，通过将实验观察结果与现有的流动模式图进行对比分析，还建立了一种适合混合碳氢工作流体冷凝两相流的新流动模式图。根据惯性力、表面张力、重力、剪切力和其他力的影响，选取马氏数、索利曼 We 和索利曼 Fr 作为流型转换标准。新的流动模式图能准确预测大多数流动模式。

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来源期刊

Experimental Thermal and Fluid Science 工程技术-工程：机械

CiteScore

6.70

自引率

3.10%

发文量

159

审稿时长

34 days

期刊介绍： Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.