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首页> 外文期刊>International Journal of Heat and Mass Transfer >Flow boiling heat transfer of HFO1234yf and HFC32 refrigerant mixtures in a smooth horizontal tube: Part Ⅱ. Prediction method
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Flow boiling heat transfer of HFO1234yf and HFC32 refrigerant mixtures in a smooth horizontal tube: Part Ⅱ. Prediction method

机译：HFO1234yf和HFC32制冷剂混合物在光滑水平管中的流沸腾传热：第二部分。预测方法

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摘要

A prediction model has been developed using the results of prior experimental investigations into the flow boiling heat transfer of pure HFO1234yf, HFC32, and their refrigerant mixtures at two mass fractions (80/20 and 50/50 by mass%) in a smooth horizontal tube having an inner diameter of 2 mm. In the prior experiment, the saturation temperature was 15 ℃, the mass fluxes ranged from 100 to 400 kg/m~2 s, and the heat fluxes ranged from 6 to 24 kW/m~2. In this paper, we propose a new semi-empirical correlation for pure refrigerants based on the superposition of the contributions from nucleate boiling and convection. We introduced two new factors in the correlation to account for the effects of the convection on two-phase flow and nucleate boiling. Comparisons between the experimental results and the predictions of seven correlations showed that the proposed correlation had reasonable agreement with the magnitudes and trends of the variations in the measured heat transfer coefficient of pure HFO1234yf, HFC32, and the 50/50 mass% mixture (with a mean absolute error of approximately 20%) when the average properties of the mixtures were used. However, this simple approach was found to overestimate the experimental results for the 80/20 mass% mixture. The inhomogeneity of the concentration in the mixture significantly affects its heat transfer with a high temperature glide; the predicted deviation was large when only the average properties of the mixture are considered. After taking into consideration the effects of mass diffusion on the flow boiling heat transfer of refrigerant mixtures, we introduced suppression factors for the mixture into both the existing and proposed correlations. Superior prediction accuracies were obtained using these modified correlations. When predicting the heat transfer coefficients of the refrigerant mixtures of HFO1234yf and HFC32 (80/20 and 50/50 by mass%), the average deviation of the proposed correlation with suppression factors was less than 20%.
机译：使用先前的实验研究结果，开发了一个预测模型，用于在光滑的水平管中对纯HFO1234yf，HFC32及其制冷剂混合物的两种质量分数（质量百分比为80/20和50/50）进行流沸腾传热具有2mm的内径。在先前的实验中，饱和温度为15℃，质量通量为100至400 kg / m〜2 s，热通量为6至24 kW / m〜2。在本文中，我们基于成核沸腾和对流贡献的叠加，提出了一种新的半经验相关的纯制冷剂。我们在相关性中引入了两个新因素，以说明对流对两相流和核沸腾的影响。实验结果与七个相关性的预测值之间的比较表明，所提出的相关性与纯HFO1234yf，HFC32和50/50质量％混合物（具有当使用混合物的平均性能时，平均绝对误差约为20％。但是，发现这种简单的方法高估了80/20质量％混合物的实验结果。混合物中浓度的不均匀性会极大地影响其在高温滑行下的传热。如果仅考虑混合物的平均性能，则预测偏差较大。考虑到质量扩散对制冷剂混合物流沸腾传热的影响后，我们将混合物的抑制因素引入现有和拟议的相关性中。使用这些修正的相关性获得了出色的预测准确性。当预测HFO1234yf和HFC32的混合制冷剂的传热系数（质量百分比为80/20和50/50）时，建议的相关性与抑制因子的平均偏差小于20％。

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  • 作者

    Minxia Li; Chaobin Dang; Eiji Hihara;

  • 作者单位

    Key Laboratory of Medium-Low Temperature Energy Efficient Utilization, Ministry of Education, Department of Thermal Engineering, Tianjin University, Tianjin, China;

    Institute of Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba, Japan;

    Institute of Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    HFO1234yf; HFC32; Refrigerant mixture; Flow boiling heat transfer; Prediction model; Low GWP refrigerant;

    机译：HFO1234yf;HFC32;制冷剂混合物;流沸腾传热;预测模型;低GWP制冷剂;

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