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首页> 外文期刊>International Journal of Heat and Mass Transfer >Investigation of heat transfer and pressure drop of CO_2 two-phase flow in a horizontal minichannel
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Investigation of heat transfer and pressure drop of CO_2 two-phase flow in a horizontal minichannel

机译：水平微通道CO_2两相流传热与压降研究

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An innovative cooling system based on evaporative CO_2 two-phase flow is under investigation for the tracker detectors upgrade at CERN (European Organization for Nuclear Research). The radiation hardness and the excellent thermodynamic properties emphasize carbon dioxide as a cooling agent in the foreseen minichannels. A circular stainless steel tube in horizontal orientation with an inner diameter of 1.42 mm and a length of 0.3 m has been used as a test section to perform the step-wise scanning of the vapor quality in the entire two-phase region. To characterize the heat transfer and the pressure drop depending on the vapor quality in the tube, measurements have been performed by varying the mass flux from 300 to 600 kg/m~2 s, the heat flux from 7.5 to 29.8 kW/m~2 and the saturation temperature from -40 to 0 ℃ (reduced pressures from 0.136 to 0.472). Heat transfer coefficients between 4kW/m~2K and 28 kW/ m~2 K and pressure gradients up to 75 kPa/m were registered. The measured data was analyzed corresponding to the dependencies on heat flux, mass flux and saturation temperature. A database has been established containing about 2000 measurement points. The experimental data was compared with common models recently developed by Cheng et al. [1,2] to cross check their applicability. The overall trends and experimental data were reproduced as predicted by the models before the dryout onset, and deviations have been analyzed. A modified friction factor for the pressure drop model [1 ] in mist flow has been proposed based on the experimental data.
机译：欧洲核研究组织（CERN）正在对基于蒸发CO_2两相流的创新冷却系统进行研究，以对跟踪探测器进行升级。辐射硬度和出色的热力学性能突出了可预见的微型通道中作为冷却剂的二氧化碳。水平方向的圆形不锈钢管的内径为1.42 mm，长度为0.3 m，已被用作测试部分，以在整个两相区域内逐步扫描蒸汽质量。为了根据管中的蒸汽质量表征传热和压降，已通过将质量通量从300更改为600 kg / m〜2 s，将热通量从7.5更改为29.8 kW / m〜2进行了测量饱和温度为-40至0℃（压力从0.136降至0.472）。记录的传热系数在4kW / m〜2K和28kW / m〜2 K之间，压力梯度高达75 kPa / m。分析了对应于热通量，质量通量和饱和温度的相关性的测量数据。建立了一个包含大约2000个测量点的数据库。将实验数据与Cheng等人最近开发的常用模型进行了比较。 [1,2]交叉检查其适用性。如模型预测的那样，在干燥开始之前复制了总体趋势和实验数据，并分析了偏差。基于实验数据，提出了雾流中压降模型[1]的修正摩擦系数。

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