Development of non-dimensional two phase heat transfer correlation based on physics of boiling

Abstract

The present paper discusses a new approach for predicting the nucleate boiling transfer coefficient based on the physics of nucleate boiling at atmospheric pressure under saturated conditions. Therefore, a non-dimensional correlation of the nucleate boiling heat transfer coefficient developed as a function of bubble departure diameter, active nucleation site density, and bubble departure frequency. A non-dimensional correlation using non-dimensional numbers such as Bond number (Bo), Prandtl number (Pr), Capillary number (Ca), and Jakob number (Ja) is proposed to predict nucleate boiling heat transfer coefficient. The Buckingham π-theorem is used to develop these non-dimensional numbers. The developed non-dimensional correlation of the bubble departure diameter (Bo) and frequency (Ca*) found to predict the present and experimental data of other investigator within an error of ±12% and ±15%, respectively. The non-dimensional nucleate boiling heat transfer coefficient (Nu) correlation based on the non-dimensional numbers found to predict own and other experimental data within an error of ±15%. The result shows the interdependency of bubble dynamic parameters to predict the nucleate boiling heat transfer coefficient.