The Experts below are selected from a list of 36 Experts worldwide ranked by ideXlab platform
Nikolai Galibin - One of the best experts on this subject based on the ideXlab platform.
-
thermophysical conditions of phase equilibrium in a Liquid Vapour System and correlation of thermodynamic parameters at the critical point
Fluid Phase Equilibria, 2002Co-Authors: Nikolai GalibinAbstract:Abstract The paper describes two equilibrium conditions of a Liquid–Vapour System and thermodynamic parameters correlation at the critical point for a number of substances with a relatively low energy of the orientational intermolecular interaction in the Liquid phase.
-
Thermophysical conditions of phase equilibrium in a Liquid–Vapour System and correlation of thermodynamic parameters at the critical point
Fluid Phase Equilibria, 2001Co-Authors: Nikolai GalibinAbstract:Abstract The paper describes two equilibrium conditions of a Liquid–Vapour System and thermodynamic parameters correlation at the critical point for a number of substances with a relatively low energy of the orientational intermolecular interaction in the Liquid phase.
Leon F. Phillips - One of the best experts on this subject based on the ideXlab platform.
-
Onsager heat of transport at the aniline Liquid–Vapour interface
Chemical Physics Letters, 2002Co-Authors: Clinton T. Mills, Leon F. PhillipsAbstract:Abstract The heat of transport for passage of matter through a gas–Liquid interface has been determined for the aniline Liquid–Vapour System, by measuring stationary-state pressure differences produced by known temperature differences over a distance of 2 mm on the Vapour side of the interface. For the range of pressures used, 2 mm is between 6 and 34 mean free paths. Coupling of the heat and matter fluxes is significant over the whole of this range. At the higher pressures the heat of transport is more than 20% of the heat of condensation; at the lower pressures it is more than 50%.
Carlo Massimo Casciola - One of the best experts on this subject based on the ideXlab platform.
-
Nucleation and growth dynamics of Vapour bubbles
Journal of Fluid Mechanics, 2019Co-Authors: Mirko Gallo, Francesco Magaletti, Davide Cocco, Carlo Massimo CasciolaAbstract:The nucleation of Vapour bubbles in stretched or overheated (metastable) Liquids is a complex phenomenon with a wide spectrum of applications. Several models, with different levels of detail, have been proposed to predict the key features of bubble dynamics from bubble formation up to its growth, transport and deformation. Most of them focus separately on a few of these aspects. Here, we present a thorough model based on an isothermal diffuse interface description of a two-phase Liquid–Vapour System endowed with thermal fluctuations, exploiting Landau and Lifshitz’s fluctuating hydrodynamic theory. The stochastic forcing allows for the spontaneous appearance of Vapour clusters inside the Liquid; the diffuse interface approach provides the hydrodynamic description of the subsequent growth and transport dynamics. In this work we focus on a coarse-grained version of this model, obtained through the averaging of the complete three-dimensional equations on spherical shells: the resulting stochastic equations will spatially depend on the radial distance from the Vapour cluster centre. The numerical simulations give access to the mean first passage time, i.e. the time until, on average, the formation of a supercritical bubble. A rough estimate shows that the computational effort is reduced by four orders of magnitude with respect to brute-force atomistic simulations and by two orders of magnitude with respect to the full three-dimensional fluctuating model. The simulations extend up to the very long time scales, allowing us to analyse inertially driven bubble oscillations in confined Systems with perfect agreement with available theoretical predictions.
Ivo Kljenak - One of the best experts on this subject based on the ideXlab platform.
-
Simulation of void fraction profile evolution in subcooled nucleate boiling flow in a vertical annulus using a bubble-tracking approach
Heat and mass transfer, 2017Co-Authors: Borut Mavko, Ivo KljenakAbstract:A three-dimensional bubble-tracking model of subcooled nucleate boiling flow in a vertical channel at low-pressure conditions is proposed with specific application to the case of boiling in an annulus with a central heating rod. Vapour is distributed in the Liquid in the form of individually tracked bubbles. The overall behaviour of the Liquid-Vapour System results from motion, interaction, coalescence and boiling mechanisms prescribed mostly at the level of bubbles. Bubbles are nucleated at nucleation sites randomly distributed over the heated surface. After nucleation, bubbles slide on the heated wall, detach and then migrate into the lower-temperature region away from the heated surface, where they condense. The proposed model was applied to experiments on subcooled boiling from Purdue University (USA). Experimental and calculated void fraction radial profiles at different axial locations are compared.
-
Simulation of void fraction profile evolution in subcooled nucleate boiling in a vertical annulus with a bubble-tracking model
Strojniški vestnik, 2017Co-Authors: Borut Mavko, Ivo KljenakAbstract:A three-dimensional bubble-tracking model of subcooled nucleate boiling flow in a vertical channel at low-pressure conditions is proposed, with specific application to the case of boiling in an annulus with a central heating rod. In the model, Vapour is distributed in the Liquid in the form of individually tracked bubbles. The overall behaviour of the Liquid-Vapour System results from motion, interaction, coalescence and boiling mechanisms prescribed mostly at the level of bubbles. The wall heat transfer coefficient and the wall temperature are calculated from one-dimensional correlations. The partitioning of the heat flux, which is consumed for bubble nucleation and heating of the Liquid, varies along the flow and depends on bubble size as well as on local flow conditions. Bubbles are nucleated with constant frequencies at fixed nucleation sites randomly distributed over the heated surface. Liquid temperature profiles at different axial locations are determined from steady-state energy balances. The nucleation site density is determined from a balance between Vapour generation rate, bubble departure sizes and nucleation frequencies. After nucleation, bubbles slide on the heated surface, detach and then gradually migrate into the low-temperature region away from the heated surface, where they eventually condense. Both bubble detachment and migration are modelled probabilistically. Bubble lateral migration is restricted by the lift force due to the Liquid velocity gradient. The proposed model was applied to experiments on subcooled boiling that were carried out at Purdue University (USA) by Bartel [1]. A good agreement between measured and calculated void fraction profiles at different axial locations was obtained.
Clinton T. Mills - One of the best experts on this subject based on the ideXlab platform.
-
Onsager heat of transport at the aniline Liquid–Vapour interface
Chemical Physics Letters, 2002Co-Authors: Clinton T. Mills, Leon F. PhillipsAbstract:Abstract The heat of transport for passage of matter through a gas–Liquid interface has been determined for the aniline Liquid–Vapour System, by measuring stationary-state pressure differences produced by known temperature differences over a distance of 2 mm on the Vapour side of the interface. For the range of pressures used, 2 mm is between 6 and 34 mean free paths. Coupling of the heat and matter fluxes is significant over the whole of this range. At the higher pressures the heat of transport is more than 20% of the heat of condensation; at the lower pressures it is more than 50%.