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TECHNICAL PAPERS: Bubbles, Particles, and Droplets

Numerical Study of a Single Bubble Sliding on a Downward Facing Heated Surface

[+] Author and Article Information
Ding Li

Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering and Applied Science, University of California, Los Angeles, 420 Westwood Plaza, Los Angeles, CA 90095-1597

Vijay K. Dhir1

Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering and Applied Science, University of California, Los Angeles, 420 Westwood Plaza, Los Angeles, CA 90095-1597vdhir@seas.ucla.edu

1

Corresponding author.

J. Heat Transfer 129(7), 877-883 (Dec 01, 2006) (7 pages) doi:10.1115/1.2717943 History: Received May 17, 2006; Revised December 01, 2006

In this study, a complete three-dimensional numerical simulation of single bubble sliding on a downward facing heater surface is carried out. The continuity, momentum, and energy equations are solved using a finite-difference method. Level-set method is used to capture the liquid-vapor interface. The shape of the sliding bubble changes from a sphere, to an ellipsoid and finally to a bubble-cap. The wall heat flux downstream of the sliding bubble is much larger than that upstream of the bubble. This indicates that wall heat transfer is significantly enhanced by sliding motion of the bubble. The bubble shape and sliding distance predicted from numerical simulations is compared with data from experiments.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 8

Temperature field (a) before bubble passes and (b) after bubble has passed predicted from numerical simulation for θ=75 deg, ΔTw=0.5°C, ΔTsub=0.6°C. The temperature difference between each isotherm is 0.085°C.

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Figure 9

Variation of the total heat transfer to the bubble for θ=75°, ΔTw=0.5°C, ΔTsub=0.6°C

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Figure 10

Variation of Nusselt number with time for θ=75 deg, ΔTw=0.5°C, and ΔTsub=0.6°C

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Figure 7

Comparison of flow pattern (a) experimental results (Qiu and Dhir (6)) and (b) numerical simulation, for θ=75 deg, ΔTw=0.5°C, ΔTsub=0.6°C

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Figure 6

The bubble sliding distance as a function of time for θ=75 deg, ΔTw=0.5°C, ΔTsub=0.6°C, experimental data obtained by Manickam and Dhir (7)

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Figure 5

The bubble diameter as a function of time for θ=75 deg, ΔTw=0.5°C, ΔTsub=0.6°C, experimental data obtained by Manickam and Dhir (7)

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Figure 4

Evolution of bubble shape for θ=75 deg, ΔTw=0.5°C, ΔTsub=0.6°C

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Figure 3

(a) The definition of interface velocity and (b) dynamic contact angle as a function of interface velocity

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Figure 2

Microlayer heat transfer per unit length in the circumferential direction as a function of contact angle (ΔTw=0.5°C)

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Figure 1

Computational domain used in the numerical simulation

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