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International Heat Transfer Conference 15

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

Thin Film Evaporation in Microchannel Membrane for Solar Vapor Generation

Ammar A. Alsheghri
Department of Mechanical and Materials Engineering, Masdar Institute of Science and Technology

TieJun Zhang
Department of Mechanical and Materials Engineering, Masdar Institute, Khalifa University of Science and Technology, P.O. Box 54224, Abu Dhabi, UAE

DOI: 10.1615/IHTC15.flm.009254
pages 3317-3329


KEY WORDS: Thin film, Evaporation, Mass transfer, Nano/Micro, Solar vapor generation, Roughness

Abstract

Thin film evaporation is investigated in microchannel membranes for solar vapor generation. Microchannel membranes serve for supporting the thin film and help extending its length. Hydrophobicity could generate large capillary pressure which enhances liquid transport. However, significantly high capillary pressures may supress evaporation. The augmented Young-Laplace equation and the kinetic theory for mass transport are used to model the evaporating thin film in microchannel membranes. The effect of vapor pressure and channels spacing on the interfacial evaporative mass flux is included. The influence of variable wall temperature profile is discussed. A new model is developed to account for the effect of rough sidewalls. The proposed work aims to offer a basis for designing thin film evaporation devices for power generation and thermal desalination systems.

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