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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

CONVECTIVE FLOWS INSIDE AND OUTSIDE AN EVAPORATING SESSILE DROP

Chafea Bouchenna
USTHB, Faculty of Mechanical and Process Engineering, LTPMP, Alger 16111, Algeria; Aix-Marseille Universite, CNRS, Laboratoire IUSTI, UMR 7343, 13453 Marseille, France

Mebrouk Ait Saada
USTHB, Faculty of Mechanical and Process Engineering, LTPMP, Alger 16111, Algeria

Salah Chikh
USTHB, Faculty of Mechanical and Process Engineering, LTPMP, Alger 16111, Algeria

Lounes Tadrist
Aix-Marseille Universite, CNRS, Laboratoire IUSTI, UMR 7343, Marseille 13453, France

DOI: 10.1615/IHTC16.bae.022585
pages 731-738


KEY WORDS: Boiling and evaporation, Two-phase/Multiphase flow, sessile drop, liquid and gas flow, heat and mass transfer, evaporation rate

Abstract

A comprehensive numerical model is developed to study the quasi-steady convective transport inside and outside an evaporating water sessile drop and its interaction with the solid substrate. The model includes the effects of the strong evaporation near the pinned contact line, thermo-capillarity, thermal buoyancy in the liquid phase and thermo-solutal buoyancy in the surrounding air. Numerical results allow analyzing the different effects. For instance, the thermo-capillary effect and the thermo-solutal convection in the gas phase may induce significant increase of heat and mass transfer at the drop edge, while thermo-capillary effect in the liquid phase on the evaporation rate is of less importance. Furthermore, the thermal energy supplied from the substrate has a substantial effect on the evaporative cooling, and the wall temperature and the thermal conductivity of the solid substrate strongly affect the evaporation kinetics.

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