Modeling of heat transfer through a liquid droplet

In dropwise condensation, the released latent heat passes through the static and sliding droplets to the condensing surface at a rate limited by various thermal resistances. In the present work, numerical simulation of heat transfer through a droplet is carried for one under static and sliding condi...

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Bibliographic Details
Published in:Heat and mass transfer 2019-05, Vol.55 (5), p.1371-1385
Main Authors: Baghel, Vishakha, Sikarwar, Basant Singh, Muralidhar, K.
Format: Article
Language:English
Subjects:
Boundary conditions
Computer simulation
Condensation
Contact angle
Deformation
Droplets
Engineering
Engineering Thermodynamics
Fluid flow
Heat and Mass Transfer
Heat flux
Heat transfer
Heat transfer coefficients
Industrial Chemistry/Chemical Engineering
Latent heat
Marangoni convection
Mathematical models
Original
Prandtl number
Reynolds number
Sensitivity analysis
Sliding
Spherical caps
Thermodynamics
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Summary:In dropwise condensation, the released latent heat passes through the static and sliding droplets to the condensing surface at a rate limited by various thermal resistances. In the present work, numerical simulation of heat transfer through a droplet is carried for one under static and sliding condition. 3-D governing equations with appropriate boundary conditions are solved for the surface, promoter layer and droplet included within the computational domain. Simulations are carried out using an in-house CFD solver. The simulation results are validated against the available data and are found in good agreement. The observations of the present work are: (a) heat transfer through the droplet achieves steady state over a timescale of micro-seconds, (b) the heat fluxes of deformed and equivalent spherical-cap droplet are found to be equal, (c) Marangoni convection is significant for Ma ≥ 2204, (d) convection is the dominant mode of heat transfer during drop slide-off (e) constriction resistance is insignificant for a copper surface of thickness ≤ 2 mm, (f) average heat flux increases with increasing contact angle, interfacial heat transfer coefficient, degree of subcooling and Reynolds number; however, it decreases with increasing Prandtl number of the liquid. These results are useful for sensitivity analysis of various thermal resistances in the mathematical modeling of dropwise condensation underneath inclined surfaces.
ISSN:0947-7411
1432-1181
DOI:10.1007/s00231-018-2520-2