Two-phase flow regimes in microchannels


Autoria(s): Rebrov, Evgeny
Data(s)

01/08/2010

Resumo

Capillary hydrodynamics has three considerable distinctions from macrosystems: first, there is an increase in the ratio of the surface area of the phases to the volume that they occupy; second, a flow is characterized by small Reynolds numbers at which viscous forces predominate over inertial forces; and third, the microroughness and wettability of the wall of the channel exert a considerable influence on the flow pattern. In view of these differences, the correlations used for tubes with a larger diameter cannot be used to calculate the boundaries of the transitions between different flow regimes in microchannels. In the present review, an analysis of published data on a gas-liquid two-phase flow in capillaries of various shapes is given, which makes it possible to systematize the collected body of information. The specific features of the geometry of a mixer and an inlet section, the hydraulic diameter of a capillary, and the surface tension of a liquid exert the strongest influence on the position of the boundaries of two-phase flow regimes. Under conditions of the constant geometry of the mixer, the best agreement in the position of the boundaries of the transitions between different hydrodynamic regimes in capillaries is observed during the construction of maps of the regimes with the use of the Weber numbers for a gas and a liquid as coordinate axes.

Identificador

http://pure.qub.ac.uk/portal/en/publications/twophase-flow-regimes-in-microchannels(1def0050-ae13-4f4f-af90-0044e8c26cb7).html

http://dx.doi.org/10.1134/S0040579510040019

Idioma(s)

eng

Direitos

info:eu-repo/semantics/restrictedAccess

Fonte

Rebrov , E 2010 , ' Two-phase flow regimes in microchannels ' Theoretical Foundations of Chemical Engineering , vol 44 , no. 4 , pp. 355-367 . DOI: 10.1134/S0040579510040019

Palavras-Chave #/dk/atira/pure/subjectarea/asjc/1500 #Chemical Engineering(all) #/dk/atira/pure/subjectarea/asjc/1600 #Chemistry(all)
Tipo

article