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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer distribution in helical coil flow boiling system
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Heat transfer distribution in helical coil flow boiling system

机译：螺旋盘管沸腾系统中的传热分布

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The objective of the present work is to study the heat transfer distribution in the helical coil flow boiling system. Infrared thermal imaging technique is used to measure the local wall temperature. The wall temperature is measured across the circumference and in axial direction along the length of a helical coil. The literature showing circumferential heat transfer distribution in a helical coil during flow boiling process is scarce. The present work compares the wall temperature and heat transfer coefficient distribution on the inner side and the outer side of helical coils at different diameter ratios and density ratios. In the present study, the experimental databank (containing total 400 heat transfer coefficient data points) includes the data not only from the present experimental study but also from the literature. The data bank includes the subcooled and the saturated flow boiling data. The data includes two fluids namely water and R123. Data covers the range of parameters namely a density ratio of 30-1600, a mass flux of 100-1300 kg/m~2 s, a heat flux of 2-640 kW/m~2, an exit quality of -0.5 to 1 and a coil to tube diameter ratio of 14-58. Ten empirical correlations which include well referred correlations of straight tubes and available correlations of helical coils are evaluated with the databank. The study concluded that the circumferential wall temperature variation in helical coils decreases with increase in a diameter ratio and with decrease in a density ratio. The circumferential averaged heat transfer coefficient during a saturated flow boiling in a helical coil is same as a straight tube. A correlation is suggested to measure the circumferential average heat transfer coefficient in helical coils.
机译：本工作的目的是研究螺旋盘绕流沸腾系统中的传热分布。红外热成像技术用于测量局部壁温。沿着螺旋线圈的长度在整个圆周上并在轴向上测量壁温。很少有文献显示在流沸腾过程中螺旋盘管中的周向传热分布。本工作比较了不同直径比和密度比的螺旋线圈内侧和外侧的壁温和传热系数分布。在本研究中，实验数据库（包含总共400个传热系数数据点）不仅包括来自本实验研究的数据，还包括来自文献的数据。数据库包括过冷和饱和流沸腾数据。数据包括两种流体，即水和R123。数据涵盖了参数范围，即密度比为30-1600，质量通量为100-1300 kg / m〜2 s，热通量为2-640 kW / m〜2，出口质量为-0.5至1盘管直径比为14-58。用数据库评估了十个经验相关性，其中包括众所周知的直管相关性和螺旋线圈​​的可用相关性。研究得出结论，螺旋线圈的周壁温度变化随着直径比的增加和密度比的减小而减小。螺旋盘管中的饱和流沸腾时的周向平均传热系数与直管相同。建议使用相关性来测量螺旋形线圈中的圆周平均传热系数。

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