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Abstract
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Article Information:
Predicting the Mean Liquid Film Thickness and Profile along the Annular Length of a Uniformly Heated Channel at Dryout
V.Y. Agbodemegbe, C.Y. Bansah, N.A. Adoo, E. Alhassan and E.H.K. Akaho
Corresponding Author: Vincent Yao Agbodemegbe
Submitted: 2011 January, 29
Accepted: 2011 February, 23
Published: 2011 March, 30 |
Abstract:
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The objective of this study was to predict the mean liquid film thickness and profile at high shear
stress using a mechanistic approach. Knowledge of the liquid film thickness and its variation with two-phase
flow parameters is critical for the estimation of safety parameters in the annular flow regime. The mean liquid
film thickness and profile were predicted by the PLIFT code designed in Fortran 95 programming language
using the PLATO FTN95 compiler. The film thickness was predicted within the annular flow regime for a flow
boiling quality ranging from 40 to 80 % at high interfacial shear stress. Results obtained for a laminar liquid
film flow were dumped into an excel file when the ratio of the actual predicted film thickness to the critical
liquid film thickness lied within the range of 0.9 to unity. The film thickness was observed to decrease towards
the exit of the annular regime at high flow boiling qualities and void fractions. The observation confirmed the
effect of evaporation in decreasing the film thickness as quality is increased towards the exit of the annular
regime.
Key words: Annular flow regime, droplets entrainment, film evaporation, flow boiling quality, interfacial shear stress, void fraction,
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Cite this Reference:
V.Y. Agbodemegbe, C.Y. Bansah, N.A. Adoo, E. Alhassan and E.H.K. Akaho, . Predicting the Mean Liquid Film Thickness and Profile along the Annular Length of a Uniformly Heated Channel at Dryout. Research Journal of Applied Sciences, Engineering and Technology, (03): 210-217.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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