Transient model for minimum film boiling point in sub-cooled film boiling
A complete transient dynamic model for bubble growth, neck breakup, bubble detachment, interface retraction, liquid-solid contact, initial nucleation, nucleation bubble growth, and coalesce in pool film boiling on a flat plate was developed to predict the heat-transfer coefficient, minimum film-boiling temperature and heat flux in subcooled liquids. Each submodel for each step was modeled separately and coupled to the next step based on the initial and boundary conditions required in each step. Criteria were proposed for the liquid-solid contact following the departing bubble and for the minimum film boiling point in subcooled film boiling, respectively. The former criterion states that liquid-solid contacts occur if the liquid-vapor interface velocity due to bubble departure is greater than a proposed minimum velocity. The latter criterion states that the minimum vapor superficial velocity on the time-history curve is the same at the minimum film boiling point for any degree of subcooling. The effects of radiation heat transfer are also included. The model's prediction of the minimum film boiling temperature with increasing subcooling temperature exhibits the same trends as experimental data in water, Freon-11, and liquid sodium.
- Research Organization:
- Wisconsin Univ., Madison (USA)
- OSTI ID:
- 6361618
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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