Numerical model for thin liquid film with evaporation and condensation on solid surfaces in systems with conjugated heat transfer

Sosnowski, P.; Petronio, Andrea; Armenio, Vincenzo

doi:10.1016/j.ijheatmasstransfer.2013.07.045

Cited by 28 publications

(22 citation statements)

References 13 publications

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“…The numerical solver was previously tested in all its parts: the evaporation and condensation process was successfully validated against different benchmark cases by Petronio [25]; the thermal coupling implementation was tested in the work of Sosnowski et al [31]; the accuracy of the flow solver and of the turbulent model were verified in the former numerical investigation on turbulent natural convection in square cavity at Ra ¼ 1:58 Â 10 9 , Ref. [7].…”

Section: Resultsmentioning

confidence: 99%

“…The presence of water phase is modelled by a thin water film. The solid-fluid thermal coupling is taken into account through the conjugate heat transfer procedure described in Sosnowski [31] (conduction), and by the evaporation source/condensation sink boundary term described in Petronio [25] (water change of phase). The numerical solver is developed within the OpenFOAM software framework.…”

Section: Discussionmentioning

confidence: 99%

“…A detailed description of the main coupling strategies can be found in the work of Duchaine et al [12,13], who also analysed the numerical stability and efficiency of the coupling algorithms. Sosnowski et al [31] proposed a Neumann-Neumann thermal coupling technique, that was used in Cintolesi et al [7] for studying the turbulent natural convection in a square cavity with conductive boundaries.…”

Section: Introductionmentioning

confidence: 99%

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Large-eddy simulation of thin film evaporation and condensation from a hot plate in enclosure: First order statistics

Cintolesi

Petronio²,

Armenio

2016

International Journal of Heat and Mass Transfer

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Numerical investigation of water evaporation and condensation in buoyancy driven flow, along with the thermal coupling between fluid and surrounding solids, is interesting for many industrial applications. The physical complexity of the evaporation and condensation processes, the mutual thermal influence of water change of phase and solid-fluid heat transfer, the anisotropy of turbulence quantities are challenging problems from numerical and theoretical side. The archetypal case of a vertical hot plate inside a cold square enclosure, filled with humid air, is studied. The solid surfaces are wetted by a thin water film. The plate cooling process due to film evaporation is analysed. Numerical simulation adopts the large-eddy methodology along with the dynamic Lagrangian sub-grid scale model. The conjugate heat transfer technique accounts for the solid-fluid thermal coupling, while the water phase is modelled under the thin film assumption. First, a preliminary case with isothermal solid boundaries and fixed film thickness is reproduced at Ra=5×108. The absence of surface heat transfer leads to analogous distribution of temperature and humidity. The cavity is characterised by strong stratification that confines the motion in the upper part. The same setting is used to simulate the case of dry air. It is found that the presence of vapour increases the velocity by a maximum of 20%. Also, the heat transfer generated by the water change of phase, in case of humid air, overcomes the other heat transfer modes. Successively, conjugate heat transfer and water film model are activated, and three cases are studied changing the plate material. The specific heat ρCp of materials is the parameter controlling the plate cooling process, that is mainly due to evaporation and the evolution of the thermodynamic field within the enclosure. An analysis of the dew-point temperature suggests that recondensation onto the plate surface cannot occur, even for materials that are rapidly cooled

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Large-eddy simulation of thin film evaporation and condensation from a hot plate in enclosure: First order statistics

Cintolesi

Petronio²,

Armenio

2016

International Journal of Heat and Mass Transfer

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“…The material property, capillary effect, and the flowing mode have a profound influence on the liquid film heat transfer in porous structures. Sosnowski et al [8] analyzed the effect of material physical properties, film inner buoyancy and temperature difference on liquid film evaporation. The liquid film thickness, liquid film flowing rate, THERMAL SCIENCE: Year 2019, Vol.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of heat transfer of flowing liquid film with inserted metal foam layer subjected to air jet impingement

Zhang

Chen

et al. 2019

THERM SCI

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Original scientific paper https://doi.org/10.2298/TSCI171014080ZIn this paper, coupling the air jet impingement and the copper metal foam above flowing liquid film were employed to enhance the heat transfer. The thickness of flowing liquid film can be controlled owing to the application of the metal foam above the film, and its solid matrix extends the air-liquid-solid interface of heating surface. The evaporated water can be supplied by the capillary force in the porous layer. The experiments were conducted to investigate the performances of the flowing liquid film with inserted porous layer subjected to impinging jet air. The air jet velocity, the flow rate and thicknesses of the liquid film as well as the porosity of metal foam influence the surface temperature of heated wall and the corresponding local heat transfer coefficient greatly. The change ratios of heat transfer coefficient due to the above factors were presented. More cooling can be obtained on the heated wall in the flowing liquid film with inserted porous layer subjected to impinging jet air while the higher liquid film velocity and air jet velocity, the thinner liquid film and the lower porosity of metal foam occur.

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“…Their results could correlate experimental data at low velocities but n increased velocity, deviance grows, and the model did not respond favorably for high velocities. Sosnowski et al (2013) investigated laminar film condensation of stagnant vapor-air mixture on solid surfaces with different substances. They used OpenFOAM to solve governing equations and showed that vapor concentration in mixture in the presence of metals is much less than non-metallic substances, therefore, the condensation rate increases on surfaces with high thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

A Similarity Solution with Two-Equation Turbulence Model for Computation of Turbulent Film Condensation on a Vertical Surface

Rad

Nadooshan

Mahmoodi

2018

JAFM

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In this paper, we presented a similarity solution for turbulent film condensation of stationary vapor on an isothermal vertical flat plate. In this method, some similarity transformations are employed and the set of governing partial differential equations (PDE) of conservation together with transport equations of turbulent kinetic energy and dissipation rate are transformed into a set of ordinary differential equations (ODE). Calculated data for the flow field, velocity profile, wall shear stress, condensate film thickness, turbulent kinetic energy, rate of dissipation, and heat transfer properties are discussed. The effect of Prandtl (Pr) number was also investigated in a wide range of variations. The obtained results showed that at high Prandtl numbers, the velocity profile becomes more uniform across the condensation film and therefore, the kinetic energy of turbulence is reduced. Furthermore, the effect of change in Pr is negligible at high Pr numbers and consequently, the flow parameters have no significant change in this range. The friction coefficient changes linearly through the condensation film and the slope of friction lines diminishes slightly by the Pr number. The rate of turbulent kinetic energy increases linearly from the wall up to about 20% of condensate film, then rises asymptotically and converges to a constant value near the liquid-vapor interface. Also, the rate of turbulent dissipation grows linearly up to 40% of condensate film thickness and then increases slightly while it oscillates.

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Numerical model for thin liquid film with evaporation and condensation on solid surfaces in systems with conjugated heat transfer

Cited by 28 publications

References 13 publications

Large-eddy simulation of thin film evaporation and condensation from a hot plate in enclosure: First order statistics

Large-eddy simulation of thin film evaporation and condensation from a hot plate in enclosure: First order statistics

Experimental investigation of heat transfer of flowing liquid film with inserted metal foam layer subjected to air jet impingement

A Similarity Solution with Two-Equation Turbulence Model for Computation of Turbulent Film Condensation on a Vertical Surface

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