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.

Copyright © 2017 by ASME
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Fig. 1

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

Grahic Jump Location
Fig. 2

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

Grahic Jump Location
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

Grahic Jump Location
Fig. 4

Grid structure near cylinder in the domain

Grahic Jump Location
Fig. 5

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

Grahic Jump Location
Fig. 6

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

Grahic Jump Location
Fig. 7

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

Grahic Jump Location
Fig. 8

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

Grahic Jump Location
Fig. 9

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

Grahic Jump Location
Fig. 10

Film boiling around horizontal neighboring cylinders

Grahic Jump Location
Fig. 11

Film boiling around vertical neighboring cylinders

Grahic Jump Location
Fig. 12

Dynamics of center of mass for two consecutive bubbles from cylinders

Grahic Jump Location
Fig. 13

Film boiling around staggered array of four cylinders in neighborhood

Grahic Jump Location
Fig. 14

Temporal variation of vapor mass concentration relative to bottom cylinder

Grahic Jump Location
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

Grahic Jump Location
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

Grahic Jump Location
Fig. 17

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




Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In