Film boiling of saturated nitrogen in horizontal tubes of double pipe heat exchangers

摘要

The data of a nitrogen film boiling experiment in horizontal tubes are presented in the paper. The experiment condition was the same as the actual application, which is neither a uniform heat flux nor a uniform wall temperature condition. The purpose is trying to find a good method to calculate the heat transfer coefficient for actual film boiling applications. The experiment data are carefully analyzed and compared with some current available correlations. A combined method is recommended in this paper for average heat transfer coefficient of film boiling in horizontal tubes based on the understanding of flow regimes.