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首页> 外文会议>ASME Heat Transfer Conference >CONVECTIVE BOILING HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS OF R134A IN A MICROFINNED HELICALLY COILED TUBE
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CONVECTIVE BOILING HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS OF R134A IN A MICROFINNED HELICALLY COILED TUBE

机译：微生物螺旋螺旋管中R134a的对流沸腾传热和压降特性

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The main purpose of this paper was to experimentally study the heat transfer and pressure drop characteristics of refrigerant R134a boiling inside a new geometry microfin helically coiled tube. Experiments were performed in a range of mass quality from 0.05 up to 0.9, mass velocity 70 ～ 380 kg/m~2s and heat flux 2.0 ～ 21.8 kW/m~2. The local and average convective boiling heat transfer coefficients were reported in this paper, which were found to be dependent on both of mass flux and heat flux. Compared with corresponding smooth helically coiled tube, the microfin helically coiled tube could enhance the convective boiling heat transfer very well. The enhancement factor was up to 2.2 with the variety of mass flux and heat flux. Heat transfer in annular flow was specially studied. A flow boiling heat transfer correlation was presented for the annular flow regime, which had a mean deviation of 9.1 %. The frictional pressure drop values were obtained by subtracting acceleration pressure drop and gravitational pressure drop from the measured total pressure drop. The frictional pressure drop data can be well correlated by Lockhart-Martinelli parameter. Considering the corresponding flow regimes, i.e., stratified and annular flow, two frictional pressure drop correlations were proposed, and showed a good agreement with the respective experimental data.
机译：本文的主要目的是通过实验研究新型微生物螺旋盘管内的制冷剂R134A沸腾的传热和压降特性。在质量质量范围内进行实验从0.05至0.9，质量速度70〜380kg / m〜2s和热通量2.0〜21.8 kW / m〜2。本文报道了局部和平均对流沸腾的传热系数，其发现依赖于质量磁通和热通量。与相应的光滑螺旋盘管相比，Microfin螺旋盘管可以提高对流沸腾热量的井。随着质量磁通量和热通量的各种，增强因子高达2.2。特别研究了环形流动的热传递。为环形流动状态提出了流沸的传热相关性，其平均偏差为9.1％。通过从测量的总压降中减去加速度压降和重力压降来获得摩擦压降值。摩擦压力下降数据可以通过LockHart-Martinelli参数提供很好的相关性。考虑到相应的流动制度，即分层和环形流动，提出了两个摩擦压力下降相关性，并与各自的实验数据显示出良好的一致性。

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