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首页> 外文会议>American Society of Mechanical Engineers(ASME) Summer Heat Transfer Conference(HT2005) vol.2; 20050717-22; San Francisco,CA(UA) >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：超细螺旋管中R134A的对流沸腾传热和压降特性

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摘要

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在新型几何形状的微翅片螺旋盘管内沸腾的制冷剂R134a的传热和压降特性。实验的质量范围为0.05至0.9，质量速度为70〜380 kg / m〜2s，热通量为2.0〜21.8 kW / m〜2。报道了局部和平均对流沸腾传热系数，发现它们与质量通量和热通量均相关。与相应的光滑螺旋盘管相比，微翅片螺旋盘管可以很好地增强对流沸腾换热。随着质量通量和热通量的变化，增强因子高达2.2。专门研究了环流中的传热。给出了环状流态的沸腾传热相关性，其平均偏差为9.1％。摩擦压降值是通过从测得的总压降中减去加速压降和重力压降而获得的。摩擦压降数据可以通过Lockhart-Martinelli参数很好地关联。考虑到相应的流态，即分层流和环形流，提出了两种摩擦压降相关性，并与各自的实验数据显示出良好的一致性。

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