A Composite Heat Transfer Model of the Film Boiling Regime

An approximate set of coupled ordinary differential equations are developed which describe the temporal evolution of the vapor domes and film over a flat plate heater surface during film boiling for the general case of a subcooled bulk liquid. Given these results, a phenomenological model is then developed to describe the intermittent surface wetting process observed to occur in the film boiling regime. Assuming that the heater surface has been locally wetted, equations are developed to predict the time-dependent heat flux during contact and the subsequent duration of the liquid dryout period. Additionally, assuming that liquid propagation along the surface is terminated at the inception of nucleate boiling, an expression is developed to predict the wetted area of contact at a given node site. The hydrodynamic and surface interaction results are then combined to obtain an expression for the composite heat flux in the film boiling regime.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Nuclear Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2014

Author dc:creator

• Farmer, Mitchell Theodore

Contributors dc:contributor

• Jones, Barclay G.

• Engineering, Nuclear

Identifier

(UMI)AAI8908677

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/70915