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Research Papers

Numerical Modeling of Multiple Bubbles Condensation in Subcooled Flow Boiling

[+] Author and Article Information
Zhenyu Liu, Huiying Wu

School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China

Bengt Sunden

Department of Energy Sciences,
Lund University,
Lund SE-221 00, Sweden
e-mail: bengt.sunden@energy.lth.se

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received October 28, 2014; final manuscript received January 23, 2015; published online April 8, 2015. Assoc. Editor: Mohamed S. El-Genk.

J. Thermal Sci. Eng. Appl 7(3), 031003 (Sep 01, 2015) (9 pages) Paper No: TSEA-14-1252; doi: 10.1115/1.4029953 History: Received October 28, 2014; Revised January 23, 2015; Online April 08, 2015

The understanding of multiple bubbles condensation is of significant importance in developing continuum models for the large-scale subcooled flow boiling. The computational fluid dynamics (CFD) modeling for multiple bubbles condensation is developed with the volume of fluid (VOF) method in this work. An explicit transient simulation is performed to solve the governing equations including the source terms for heat and mass transfer due to condensation. The geometric reconstruction scheme, which is a piecewise linear interface calculation (PLIC) method, is employed to keep the interface sharp. The surface tension is modeled by the continuum surface force (CSF) approach, which is taken into account in the numerical model. Numerical simulations predict the dynamical behavior of the actual condensing bubbles. The results show that the condensation rate of a single bubble is influenced by the velocity of the fluid flow and the temperature difference between the bubble and fluid. For multiple bubbles, the effect of bubble–bubble interaction on their condensation process is analyzed based on the numerical predictions. The condensation rate of lower bubbles increases due to the random perturbation induced by other bubbles. The influence of other bubbles on the condensation rate can be neglected if the distances between the bubbles are large enough.

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Figures

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Fig. 1

CFD model; (a) boundary conditions and (b) 3D view (velocity vectors in the liquid)

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Fig. 2

The mesh in the computational domain; (a) uniform mesh and (b) the mesh in the computational domain

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Fig. 3

Comparison of bubble volume with results in Ref. [7]

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Fig. 4

Comparison of adiabatic and condensing bubble dynamics

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Fig. 5

Comparison of condensing bubble dynamics for different liquid water velocity

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Fig. 6

Cross section of the condensing bubble; (a) temperature and (b) velocity vector in the subcooled boiling flow

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Fig. 7

Velocity distribution for merging process of two bubbles

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Fig. 8

Initial configurations (dB = 3 mm and 5 mm)

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Fig. 9

Multiple bubbles condensation process for (a) dB = 3 mm and (b) dB = 5 mm at Vin = 0.2 m/s

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Fig. 10

Comparison of bubble diameters for different bubble distances

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