Study on Two Phase Pressure Drop of Saturated Boiling in Narrow Gap Channel under High Pressure

An experiment on two phase pressure drop in narrow rectangular channel was carried out.The experiment shows that the current classical correlations and the prediction methods based on air-water and organic coolant are with large deviation in the prediction of the pressure drop in narrow rectangular channels.The dimensionless Nconf number was used as an important parameter to predict the pressure drop in narrow rectangular channel.Prediction is conducted by the correlations for saturated two-phase resistance in narrow rectangular channels based on Chisholm’s B coefficient method.The deviation of predicted result with the experimental data is within ±10%.