Research on Prediction Model of Subcooled Boiling Heat Transfer Coefficient in Narrow Rectangular Channel under High Pressure
To effectively predict the heat transfer coefficient of subcooled boiling in narrow rectangular channels under high pressure,the existing heat transfer models were evaluated based on experimental da-ta,analyzing the reasons that affected the prediction effect.By conducting linear regression analysis on the experimental data,a wall superheat model that distinguished between high and low subcooling ranges was proposed.The model can be used under the following conditions:pressurep of 10 to 16 MPa,mass flux G of 500 to 1 500 kg/(m2·s),heat flux q of 100 to 300 kW/m2,and subcooled temperature ΔTsub of 0 to 37 ℃.The results show that the wall superheat models for fully developed boiling are in accord-ance with the heat transfer coefficient of this study,while most predictive correlations underestimate the heat transfer coefficient at high pressure.Besides,there is also a large prediction deviation in the low subcooling region near the saturation point;the prediction effects of enhanced heat transfer correlations are not satisfactory,and the main factors affecting prediction deviation are operating conditions and chan-nel geometries.
narrow rectangular channelsubcooled boilingheat transfer coefficientprediction model
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