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Flow boiling heat transfer on a heating element restricted by an interference sleeve
Arcot R. Balakrishnan
Published in Elsevier Science Inc, New York, NY, United States
1998
Volume: 19
   
Issue: 6
Pages: 661 - 671
Abstract
The flow boiling phenomenon over a heated tube restricted by an interference sleeve, which is a passive enhancement technique, has been analysed using a semi-empirical approach. The liquid boiled was water flowing through an annular cross-section. A model developed earlier for the case of pool boiling over porous surfaces has been adapted after modification to pool boiling with interference surfaces using equivalent geometrical parameters and a modified permeability factor. This was further extended to saturated flow boiling situation using an additive mechanism. The single phase heat transfer coefficient required for the additive mechanism is obtained from an experimental correlation developed in the present study. The suppression factors evaluated for the eight sleeve geometries used in the present investigation are expressed in terms of the single phase Reynolds number and the Martinelli parameter. Very good agreement was observed between the model predictions and experimental data validating the mechanisms postulated. Further, a purely empirical correlation based on the present experimental data has been proposed to estimate the two-phase heat transfer coefficient. While the empirical correlation shows a better fit with the experimental data, the additive model has a physical basis.The flow boiling phenomenon over a heated tube restricted by an interference sleeve, which is a passive enhancement technique, has been analysed using a semi-empirical approach. The liquid boiled was water flowing through an annular cross-section. A model developed earlier for the case of pool boiling over porous surfaces has been adapted after modification to pool boiling with interference surfaces using equivalent geometrical parameters and a modified permeability factor. This was further extended to saturated flow boiling situation using an additive mechanism. The single phase heat transfer coefficient required for the additive mechanism is obtained from an experimental correlation developed in the present study. The suppression factors evaluated for the eight sleeve geometries used in the present investigation are expressed in terms of the single phase Reynolds number and the Martinelli parameter. Very good agreement was observed between the model predictions and experimental data validating the mechanisms postulated. Further, a purely empirical correlation based on the present experimental data has been proposed to estimate the two-phase heat transfer coefficient. While the empirical correlation shows a better fit with the experimental data, the additive model has a physical basis.
About the journal
JournalData powered by TypesetInternational Journal of Heat and Fluid Flow
PublisherData powered by TypesetElsevier Science Inc, New York, NY, United States
ISSN0142727X
Open AccessNo
Concepts (16)
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    Boiling liquids
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    Correlation methods
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    ELECTRIC HEATING ELEMENTS
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    Geometry
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    Heat transfer coefficients
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    Mathematical models
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    Mechanical permeability
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    Porous materials
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    Reynolds number
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    Tubes (components)
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    Flow boiling
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    MARTINELLI PARAMETER
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    Heat transfer
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    Boiling
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    Heating
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    Model