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Research Papers: Evaporation, Boiling, and Condensation

Interaction of Asymmetric Films Around Boiling Cylinder Array: Homogeneous Interface to Chaotic Phenomenon

[+] Author and Article Information
Akash Deep

Department of Mechanical and
Industrial Engineering,
IIT Roorkee,
Roorkee 247667, India
e-mail: deepakashdeep96@gmail.com

Chandan Swaroop Meena

CSIR-Central Building Research Institute,
Roorkee 247667, India
e-mail: chandanswaroop2008@gmail.com

Arup Kumar Das

Department of Mechanical and
Industrial Engineering,
IIT Roorkee,
Roorkee 247667, India
e-mail: arupdas80@gmail.com

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 19, 2016; final manuscript received November 14, 2016; published online January 18, 2017. Editor: Portonovo S. Ayyaswamy.

J. Heat Transfer 139(4), 041502 (Jan 18, 2017) (11 pages) Paper No: HT-16-1020; doi: 10.1115/1.4035312 History: Received January 19, 2016; Revised November 14, 2016

We report numerical study of film boiling around hot and horizontal cylinders in a saturated water pool to establish interfacial interactions leading toward dryout. Volume of fluid-based finite-volume discretization is performed in the domain for incorporation of source term in mass momentum and energy conservation equations due to phase change. At first, film boiling around single cylinder is simulated at different surface temperatures to understand unconstrained film growth and subsequent film bubble release due to buoyancy. Using velocity vectors and temperature contours, effect of film flow dynamics on bubble departure is depicted. This study has been extended further with multiple cylinders in three different stacking arrangements in order to understand the interaction of films in vicinity. Vertical interaction between cylinders leads to suppression of bubble release at the lower cylinder in comparison to the upper one. In the case of horizontal interactions, bubbles attract each other and merge, provided favorable pitch between cylinders and temperatures of the surfaces is maintained. Offset four cylinders stack maintaining vertical and horizontal pitch allows both lateral vapor affinity and bubble suppression in the lower most cylinder simultaneously. With time interaction of accumulated vapor films around cylinders hinders replenishment of fresh liquid to the hot surfaces leading toward chaotic phenomena or dryout in boiling heat transfer.

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References

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Figures

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Fig. 1

Flow chart of the numerical solver explicitly showing the user-defined function

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Fig. 2

Various configurations of hot horizontal cylinders in numerical simulations and boundary conditions

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Fig. 3

Variation of surface heat flux for wide range of cell numbers showing grid independence solution: 4080 cells ≈ 0.75 mm near the cylinder, 12,913 cells ≈ 0.4 mm near the cylinder, and 24,304 cells ≈ 0.29 mm near the cylinder

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Fig. 4

Grid structure near cylinder in the domain

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Fig. 5

Nature of heat flux variation with time and validation of average heat flux with Bromley's correlation

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Fig. 6

Azimuthal variation of vapor film thicknesses at different time levels from single cylinder

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Fig. 7

Comparison of shape and size in vapor mushroom release with degree of superheat of the cylinder

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Fig. 8

Velocity vectors at different time instants for single cylinder at ΔTsup = 40 K

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Fig. 9

Temperature contours at different time instants for single cylinder at ΔTsup = 40 K

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Fig. 10

Film boiling around horizontal neighboring cylinders

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Fig. 11

Film boiling around vertical neighboring cylinders

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Fig. 12

Dynamics of center of mass for two consecutive bubbles from cylinders

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Fig. 13

Film boiling around staggered array of four cylinders in neighborhood

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Fig. 14

Temporal variation of vapor mass concentration relative to bottom cylinder

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Fig. 15

Velocity vectors for (a) horizontal inline configuration at t = 0.05 s, (b) vertical inline configuration at t = 0.08 s, and (c) staggered configuration at t = 0.047 s

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Fig. 16

Temperature contours for (a) horizontal inline configuration at t = 0.06 s, (b) vertical inline configuration at t = 0.04 s and t = 0.2 s, and (c) staggered configuration at t = 0.05 s

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Fig. 17

Comparisons of surface-averaged heat flux for different stacking configurations including no neighbor situation

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