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Multiphase Science and Technology
SJR: 0.124 SNIP: 0.222 CiteScore™: 0.26

ISSN Imprimir: 0276-1459
ISSN On-line: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.2018017146
pages 333-349

EMHD EFFECTS ON SUBCOOLED BOILING IN A VERTICAL ANNULUS

Mohammad Yaghoub Abdollahzadeh Jamalabadi
Department of Mechanical, Robotics and Energy Engineering, Dongguk University-Seoul, 30 Pildong-ro 1gil, Jung-gu, Seoul 100-715, Republic of Korea

RESUMO

In this study, the simulation of a steady-state water vapor-water liquid system heated in a vertical annulus with an upward flow under electromagnetohydrodynamics (EMHD) is performed. The annulus is partially heated with the inlet condition of subcooling near saturation. To model the subcooled boiling heat transfer of axial flow the assumptions of nonhomogeneous properties, nonswirling flow, and nonequilibrium between phases is used. Governing equations including the conservation of mass, momentum, and energy are solved by the finite-volume method in axial dimension. The mass transfer is considered in mass conservation; the gravity and EMHD force in momentum conservation; and the viscous dissipation, Joule heating, and radiation are included in the energy conservation. Comparison of area-averaged gas fraction along the axial direction with experimental results showed the accuracy of the numerical modeling. It was seen that the EMHD can decrease the phase transfer rate, and change the velocity difference between phases, volume forces, and dissipation terms. Also the friction factor and Joule heating were augmented by the EMHD forces.


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