Work

Impact of the interface heat defect on the thermocapillary response of the phase boundary in a liquid–gas system upon local heating from below

Year: 2025

Type: article

Abstract: The problem of thermocapillary convection induced by local boundary heating in a closed cell filled with a volatile liquid and an overlying gas–vapor mixture is studied. The mathematical model is based on the Boussinesq approximation of the nonstationary Navier – Stokes equations for a viscous incompressible fluid . It includes the heat balance condition on the liquid–gas contact boundary in a generalized form to correctly take into account effects of thermodiffusion and evaporation as well as energy characteristics of the surface which govern the thermocapillary response of the interface. Numerical simulation is carried out in order to ascertain the influence of the heat defect on the amplitude of interface deformations and evolution of convective regimes upon heating by thermal sources embedded in the cuvette substrate. A comparative analysis of the results obtained within the frame of classical and generalized problem statements enables to estimate the impact of energy spent by the Marangoni force to deform the interface: the effect results in a decrease in the depth of a thermocapillary dimple in the zone of thermal load and in the amplitude of phase boundary oscillations.

Source: International Journal of Multiphase Flow

DOI: 10.1016/j.ijmultiphaseflow.2025.105260

Authors: Victoria B. Bekezhanova, Olga N. Goncharova

Institutions: University of Tyumen, Institute of Computational Modeling, Altai State University

Language: English

Topic: Fluid Dynamics and Heat Transfer

Subfield: Computational Mechanics

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,900

Funders: Ministry of Education and Science of the Russian Federation, Sobolev Institute of Mathematics, Siberian Branch, Russian Academy of Sciences