Assessment of Models for Onset of Flow Instability Experimental Data in Narrow Rectangular Channel
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摘要: 以未除气去离子水为工质,在P=1~15 MPa,G=500~2 000 kg/(m2.s),△Tsub,in=20~100℃,q=40~1 000 kW/m2的参数范围,以1 000 mm×25 mm×2 mm矩形窄缝通道内垂直向上流动条件下流动不稳定起始点的实验数据为依据,对Saha-Zuber,Levy,Bowring等人提出的预测OSV点关系式和Whittle&Forgan,Lee&Bankoff,Kennedy等人提出的预测OFI点关系式进行了对比分析。结果表明:建立在过冷沸腾基础上的这些预测关系式对OFI点的预测偏差大部分在±20%以内,而其预测结果在低热流密度下低于实验值,在高热流密度下预测结果高于实验值。同时,基于实验数据建立了一个流动不稳定起始点的计算关系式:qOFI=1.95qsat0.87,其预测偏差在±15%以内。与其它实验数据的对比结果表明:本文得到的关系式对其它通道也具有比较好的适用性。Abstract: Assessment of models for Onset of Significant Void and Onset of Flow Instability was carried out against narrow rectangular channel (1 000 mm×25 mm×2 mm) experimental data in the condition of:P=1~15 MPa,G=500~2 000 kg/(m2.s),△Tsub,in=20~100℃,q=40~1 000 kW/m2.The results showed the correlations of Saha-Zuber,Levy and Bowring for OSV and the correlations of W&F,Lee&Bankoff and Kennedy for OFI predicted the experimental results within ±20%,but predicted OFI obviously lower at low heat flux and higher results at high heat flux.A new purely empirical correlation was developed by comparing the heat flux leading to OFI with that leading to saturation:qOFI=1.95qsat0.87.The deviation is within ±15%.It is also suitable for other types of channels and parameters.
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Key words:
- Narrow rectangular channel /
- Flow instability /
- Onset of flow instability
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