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International Heat Transfer Conference 13

ISBN Imprimir: 1-56700-226-9 (CD)
ISBN En Línea: 1-56700-225-0

NUMERICAL INVESTIGATION OF SUBCOOLED BOILING FLOWS USING TWO POPULATION BALANCE APPROACHES

DOI: 10.1615/IHTC13.p28.190
page 10

Mark Kai Ming Ho
Nuclear Analysis Section, Reactor Operations, Australian Nuclear Science and Technology Organisation, Menai, Australia 2234

Guan Heng Yeoh
School of Mechanical and Manufacturing Engineering University of New South Wales, NSW 2052, Australia; Australian Nuclear Science and Technology Organisation (ANSTO), PMB 1, Menai, NSW 2234, Australia

Jiyuan Tu
School of Engineering, RMIT University, Bundoora, VIC 3083, Australia; Key Laboratory of Ministry of Education for Advanced Reactor Engineering and Safety, Institute of Nuclear and New Energy Technology, Tsinghua University, 30 Shuang Qing Rd. Haidian District, Beijing 100086, China

Sinopsis

In this study, both the population balance approach based on the MUltiple SIze Group (MUSIG) model and the Average Bubble Number Density transport equation (ABND) model for three dimensional, low pressure, gas-liquid, subcooled boiling, vertical flows are examined. The purpose of this study is to assess the ability of both models to predict the radial profile of void fraction, bubble Sauter mean diameter and interfacial area concentration which characterise subcooled boiling. Improvement in the ABND model to simulate gas-liquid bubbly flows with heat transfer was achieved by combining the condensation expression with the gaseous mass transport equation within the CFD commercial code CFX4.4. Overall, both the ABND model and the MUSIG model provided good results in terms of the abovementioned criteria when compared against experimental measurements. However, the ABND model was found to have limitations in predicting high subcooled boiling flows due to the lack of bubble size resolution to adequately capture the effect of condensation over a range of bubbles sizes. It is concluded that the ABND model provides an economic alternative to the MUSIG model in terms of complexity and computational time, as long as one is aware of the limitations in simulating high subcooling flow regimes.

IHTC-13 Digital Library

Measurement of fluid temperature with an arrangement of three thermocouples FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION