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Interfacial Phenomena and Heat Transfer
ESCI SJR: 0.146

ISSN Imprimir: 2169-2785
ISSN En Línea: 2167-857X

Open Access

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2017020238
pages 191-205

FEATURES OF TWO-PHASE FLOW REGIMES IN A HORIZONTAL RECTANGULAR MICROCHANNEL WITH THE HEIGHT OF 50 µm

Fedor V. Ron'shin
Kutateladze Institute of Thermophysics SB RAS, 630090, Novosibirsk, Russia; Novosibirsk State University, 630090, Novosibirsk, Russia
Vyacheslav Cheverda
Institute of thermophysics
Evgeny Anavitolievich Chinnov
Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia; Novosibirsk State University, 630090 Novosibirsk, Russia
Oleg A. Kabov
Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences, 1, Acad. Lavrentyev Ave., Novosibirsk, 630090, Russia; Institute of Power Engineering, National Tomsk Polytechnic Research University, 7, Usova Street, Tomsk, 634050, Russia; Novosibirsk State University, 2, Pirogova str., Novosibirsk, 630090, Russia

SINOPSIS

Two-phase flows of distilled deionized nanofiltered water and nitrogen gas in a microchannel with a height of 50 µm and a width of 20 mm have been investigated experimentally, in which the schlieren method was used to determine the main features of the two-phase flow in the microchannel. The two-phase flow regimes and the boundaries between them were investigated, and the following flow regimes were distinguished: bubble, churn, jet, stratified, and annular. The optical methods used allow detecting the liquid film on the lower and upper walls of the microchannel. The peculiarities of the two-phase flow were discovered in almost all flow regimes, such as the formation of droplets of various shapes and sizes as well as vertical liquid bridges. Several types of liquid bridges have been distinguished, such as movable and stationary vertical liquid bridges and horizontal bridges. Sessile liquid droplets with diameters of less than 1 mm located on the microchannel walls were also observed, and the main two-phase flow regimes and the boundaries between them have been detected. A comparison of regime maps for channels with different cross sections was carried out, and the height and width of the rectangular microchannel are shown to have a significant impact on the boundaries between the regimes.