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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

INVESTIGATION OF SUBCOOLED FLOW BOILING HEAT TRANSFER AT 1 ~ 3 BAR

DOI: 10.1615/TFESC1.mph.012795
pages 1901-1907

Randy Samaroo
Department of Mechanical Engineering, City College of New York, New York, USA

Pervej Rahman
Department of Mechanical Engineering, City College of New York, New York, USA

Masahiro Kawaji
Department of Mechanical Engineering, City College of New York, New York, USA; The CUNY Energy Institute, City University of New York, New York, USA; Dept. of Chemical Engineering & Applied Chemistry, University of Toronto, Canada


KEY WORDS: subcooled flow boiling, vapor bubbles, heat flux, wall superheat, boiling curve

Abstract

Subcooled flow boiling experiments have been performed to obtain a better understanding of vapor bubble behavior under nucleation and entrainment by liquid flow. The main objective of this work is to obtain data to validate 3-D Interface Tracking Models and CFD models which can predict subcooled flow boiling phenomena in fuel assemblies of Pressurized Water Reactors (PWRs). In the experiment, the test section is a vertically oriented annulus of 6.35mm gap width with electrically heated inner rod with thermocouples embedded on the heated surface. Subcooled water at pressures from 1-3bar flowed upward through the test section under turbulent flow conditions. Liquid Reynolds numbers range between 26,000~55,000, with heat fluxes between 15~42kW/m2. The experiments yielded bubble size and directly measured wall temperature data. Measurements were taken using a high speed video camera with simultaneous temperature acquisition.

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