Analytical and experimental investigation of convective film boiling heat transfer
An experimental and analytical investigation of convective film boiling was performed. The experimental work involved the acquisition of the axial variation of thermodynamic nonequilibrium in convective film boiling. The experiment resulted in the reporting of 579 data points for thermodynamic nonequilibrium, much larger than the size of the entire nonequilibrium data base at the start of this study. Comparison of existing convective film boiling models to these new data, as well as some data taken at Idaho National Engineering Laboratory in conjunction with this study, showed that no previously existing correlation could adequately predict the data. The high vapor generation rate near the quench front was an unexpected finding from the vapor superheat data, and no previously existing model could predict this behavior. Therefore, a two-region vapor generation model was developed consisting of a near-field region and a far-field region. The heat transfer from the well to the vapor is also higher than can be calculated by a vapor-phase correlation, which has been commonly used in existing models. The improvement in heat transfer coefficient was correlated in terms of a sink function which represents the enhancement of heat transfer due to the entrained liquid. A two-dimensional conservation equation approach was formulated to evaluate the radial and axial variation of the vapor superheat.
- OSTI ID:
- 6361567
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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