| Heat transfer measurements were made for stable film boiling of water over a horizontal flat stainless steel plate from the minimum film boiling point temperature, T;Heat transfer measurements were made without the presence of film boiling for nitrogen jetting into an overlying pool of water from nine 1-mm-diameter holes, placed in the heat transfer plate. The heat flux was maintained constant at approximately 26.4 kW/m;Finally, a database was developed for the heat transfer from the plate with both film boiling and gas jetting occurring simultaneously, in a pool of water maintained at its saturation temperature. The effect of passing nitrogen through established film boiling is to increase the heat transfer from that surface. At the highest measured superficial gas velocity, approximately 8.5 cm/s, and for a constant surface temperature, the heat transfer increases by a factor of two over the heat transfer with no gas flux enhancement. Further, as the superficial gas velocity approaches zero the data approach the stable film boiling data. A semi-empirical model was developed and correlated to the database. The result is an equation which represents better than 90% of all the measured data within... |
