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

ISSN Imprimir: 0276-1459
ISSN En Línea: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.2019028624
pages 73-85

MULTIDIMENSIONAL SIMULATION OF THERMAL NONEQUILIBRIUM FLOWS IN A CONVERGENT-DIVERGENT NOZZLE

Avick Sinha
Indian Institute of Technology Bombay, Mumbai, India, 400076
Shivasubramanian Gopalakrishnan
Indian Institute of Technology Bombay, Mumbai, India, 400076

SINOPSIS

The aim of this effort is to employ the homogeneous relaxation model to study thermal nonequilibrium in flash boiling flows. The use of convergent-divergent nozzles is prevalent in geothermal total flow systems for power generation, and the understanding of the physics of two-phase flows in such systems is of primary importance to achieve greater efficiencies. Most numerical studies for such nonequilibrium phase-change models have used one dimensional approaches, but the objective of the present work is to utilize a multidimensional computational fluid dynamics implementation for such complex flows. It was observed that the slip between the vapor and liquid along the divergent section of the nozzle and the maximum nonequilibrium pressure drop at the nozzle throat due to the thermal nonequilibrium causes an increase in the nozzle efficiency with the decrease in back pressure. The model was validated against experimental measurements and it was observed that the simulations are in good agreement with the multidimensional features observed in the experiments.

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