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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Heat transfer characteristics and flow pattern during two-phase flow boiling of R134a and R407C in a horizontal smooth tube
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Heat transfer characteristics and flow pattern during two-phase flow boiling of R134a and R407C in a horizontal smooth tube

机译：水平光滑管中R134a和R407C两相流沸腾过程中的传热特性和流型

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摘要

Experiments to measure flow boiling heat transfer coefficients and pressure drops of R134a and R407C inside a smooth horizontal tube (9.52 mm outside diameter, 1.2 m length) were performed at a refrigerant mass flux range of about 100–400 kg/m~2 s varying the inlet temperature of the evaporator within the range of 5–9 ?C, with heat fluxes within the range 3–10 kW/m~2. The experimental data are described in terms of the heat transfer coefficients and pressure drop gradient as a function of the vapor quality. The experimental results clearly show that the heat transfer coefficients of R134a are always higher than those of R407C (for a minimum of +55% to a maximum of +87%) for same operating conditions. Furthermore, an assessment of predictive methods is provided for heat transfer coefficients and pressure drop gradients; also a comparison of flow regimes visualizations for R134a with a flow pattern map available in the literature has been presented.
机译：在大约100-400 kg / m〜2 s的制冷剂质量流量范围内，进行了测量光滑的水平管（外径为9.52 mm，长度为1.2 m）内R134a和R407C的沸腾传热系数和压降的实验蒸发器的入口温度在5–9°C范围内，热通量在3–10 kW / m〜2范围内。根据传热系数和压降梯度随蒸汽质量变化来描述实验数据。实验结果清楚地表明，在相同的工作条件下，R134a的传热系数始终高于R407C（最小为+ 55％，最大为+ 87％）。此外，对传热系数和压降梯度的预测方法进行了评估。还提供了R134a流动状态可视化与文献中可用的流动模式图的比较。

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