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首页> 外文会议>8th IIR Gustav Lorentzen conference on natural working fluids (GL2008) >FLOW PATTERNS AND HEAT TRANSFER CHARACTERISTICS OF FLOW BOILING OF CO_2 AND OIL MIXTURES IN HORIZONTAL SMOOTH AND MICRO-FIN TUBES
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FLOW PATTERNS AND HEAT TRANSFER CHARACTERISTICS OF FLOW BOILING OF CO_2 AND OIL MIXTURES IN HORIZONTAL SMOOTH AND MICRO-FIN TUBES

机译：水平光滑和微翅片管中CO_2和油混合物的沸腾流动模式和传热特性

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摘要

Experiments on flow patterns and flow boiling heat transfer of pure CO_2 and CO_2-oil mixtures inrnhorizontal smooth and helical grooved micro-fin tubes have been carried out. The smooth tube is arnstainless steel tube, 3.76mm in inner diameter, and the micro-fin tube is a copper tube, 3.75mm inrnmean inner diameter. Experiments were conducted at mass velocities from 100 to 380kg/(m~2s),rnsaturation temperature of 10℃, heat fluxes from 10 to 30 kW/m~2, and oil circulation ratio from 0 torn1.0mass%. For the smooth tube, the flow patterns were observed, and the results were comparedrnwith the flow pattern map developed by Cheng et al., and the heat transfer coefficient in pre-dryoutrnregion increases with the increase in heat flux in case of pure CO_2. These results indicate that thernflow boiling heat transfer is dominated by nucleate boiling. The heat transfer coefficient decreasesrnslightly with the increase in vapor quality at high heat flux conditions. This tendency is consideredrndue to the partial dryout occurred on the upper perimeter of the tube. In case of CO_2-oil mixtures,rnthe heat transfer coefficient in pre-dryout region decreases significantly than that of pure CO_2. Thernflow patterns and heat transfer coefficients in the micro-fin tube were compared with those for thernsmooth tube.
机译：进行了纯CO_2和CO_2-油混合物在水平光滑和螺旋沟槽微翅片管中的流型和流沸腾传热实验。光滑管是不锈钢管，内径为3.76mm，微翅片管是铜管，内径为3.75mm。在100到380kg /（m〜2s）的质量速度，10℃的饱和温度，10到30 kW / m〜2的热通量和0到1.0质量％的油循环比率下进行实验。对于光滑管，观察了流型，并将结果与​​Cheng等人开发的流型图进行了比较，在纯CO_2的情况下，预干燥区的传热系数随热通量的增加而增加。这些结果表明，核沸腾是热流沸腾传热的主导。在高热通量条件下，传热系数随蒸气质量的增加而略有下降。认为这种趋势是由于在管的上周边发生了局部变干。对于CO_2-油混合物，预干燥区的传热系数明显低于纯CO_2。将微翅片管中的流动模式和传热系数与光滑管进行了比较。

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  • 来源
  • 会议地点 Copenhagen(DK);Copenhagen(DK);Copenhagen(DK)
  • 作者

    L. GAO; T. ONO; T. HONDA;

  • 作者单位

    Department of Mechanical Engineering of Fukuoka University, 8-19-1 Nanakuma Jonan-ku, Fukuoka, 8140180, JapanrnFax: +81-92-871-6031, e-mail: gao@cis.fukuoka-u.ac.jp;

    rnDepartment of Mechanical Engineering of Fukuoka University Graduated School;

    rnDepartment of Mechanical Engineering of Fukuoka University;

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  • 正文语种 eng
  • 中图分类 制冷工程;
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