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Investigation of the phenomena occurring near the liquid–vapor interface during evaporation of water at low pressures

Mohammad Amin Kazemi1, David S. Nobes2,*, and Janet A. W. Elliott1

  • 1Department of Chemical and Materials Engineering, University of Alberta, Canada, T6G 1H9
  • 2Department of Mechanical Engineering, University of Alberta, Canada, T6G 1H9

  • *david.nobes@ualberta.ca
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Phys. Rev. Fluids 3, 124001 – Published 12 December, 2018

DOI: https://doi.org/10.1103/PhysRevFluids.3.124001

Abstract

The evaporation of water in a rectangular microchannel at low pressures was studied experimentally and numerically to demonstrate the interplay between the heat transfer and fluid dynamics during evaporation of the liquid at low pressures. The three-dimensional flow below the interface was quantified using scanning particle image velocimetry. Temperatures in the fluids on the centerline in both phases as well as the liquid temperatures along the interface were measured with a fine thermocouple. A numerical simulation, which accounted for the transport of mass, momentum, and energy in the fluids as well as those at the interface, was developed and validated with the measured experimental data. Once good agreement between the model and the experimentally obtained parameters was achieved, the model was used to examine some aspects of the evaporation phenomenon which could not be understood from the experiments alone. An important result from this work has shown that a buoyancy driven flow in the liquid water competes with a thermocapillary flow at the interface and does not allow the thermocapillary flow to spread over the interface. This is suggested to be a possible answer to the the question of why a thermocapillary flow in water, in contrast to many other liquids, does not always exist.

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Phys. Rev. Fluids 3, 124001– Published 12 December, 2018
  • Received 17 May 2018
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