A transient micro-convection model of nucleate pool boiling

✍ Scribed by S.Imam Haider; Ralph L. Webb

• Book ID: 104136364
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 1015 KB
• Volume: 40
• Category: Article
• ISSN: 0017-9310
• DOI: 10.1016/s0017-9310(96)00372-9

✦ Synopsis

This work advances the fundamental understanding of nucleate pool boiling on plain surfaces. A model is developed for prediction of the nucleate boiling coefficient as a function of the bubble dynamics characteristics (nucleation site density, bubble departure diameter and bubble frequency). This work extends that of Mikic and Rohsenow, who developed a model based on transient conduction to the superheated liquid layer. The present model includes the effects of transient convection to the liquid, as a result of convection in the wake of the departing bubbles. An asymptotic correlation is used to patch the transient coaduction and the steady-state convection asymptotes to cover the full bubble cycle. The predicted heat transfer coefficient is compared using data for R-11 and R-123, and good agreement is found. The model shows that the contribution of transient conduction is small compared to transient micro-convection. It is believed that this is the first successful demonstration of a mechanistically based model for nucleate boiling on plain surfaces.