NDLI: Numerical Simulation of Thermofluid Characteristics of Two-Phase Slug Flow in Microchannels

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Mehdizadeh, A. Sherif, S. A. Lear, W. E.
Copyright Year	2010
Abstract	A fundamental study of heat transfer characteristics of two-phase slug flow in microchannels is carried out employing the Volume-of-Fluid (VOF) method. Despite of the fact that numerical simulations of two-phase flows in microchannels have been attempted by many investigators, most efforts seem to have failed in correctly capturing the flow physics, especially those pertaining to the slug flow regime characteristics. The presence of a thin liquid film in the order of 10 μm around the bubble is a contributing factor to the above difficulty. Typically, liquid films have a significant effect on the flow field and heat transfer characteristics. In the simulations reported in this paper, the film is successfully captured and a very high local convective heat transfer coefficient is observed in the film region. A strong coupling between the conductive heat transfer in the solid wall and the convective heat transfer in the flow field is observed and characterized. Results showed that unsteady heat transfer through the solid wall in the axial direction is comparable to that in the radial direction. Results also showed that a fully developed condition could be achieved fairly quickly compared to single-phase flows. The fully developed condition is defined based on the Peclet number (Pe) and a dimensionless length of the liquid slug. Local and time-averaged Nusselt numbers for slug flows are reported for the first time. It was found that significant improvements in the heat transfer coefficient could be achieved by short slugs where the Nu number was found to be 610% higher than in single-phase flows. The study revealed new findings related to slug flow heat transfer in microchannels with constant wall heat flux.
Sponsorship	Heat Transfer Division
Starting Page	253
Ending Page	262
Page Count	10
File Format	PDF
ISBN	9780791849415
DOI	10.1115/IHTC14-23282
e-ISBN	9780791838792
Volume Number	2010 14th International Heat Transfer Conference, Volume 6
Conference Proceedings	2010 14th International Heat Transfer Conference
Language	English
Publisher Date	2010-08-08
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Lubrication theory Computer simulation Flow (dynamics) Convection Heat flux Physics Microchannels Bubbles Fluids Simulation Slug flows Two-phase flow Engineering simulation Liquid films Thermofluids Heat transfer coefficients Heat transfer
Content Type	Text
Resource Type	Article

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