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Interfacial Phenomena and Heat Transfer

Publicado 4 números por año

ISSN Imprimir: 2169-2785

ISSN En Línea: 2167-857X

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Indexed in

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

Volumen 4, Edición 2-3, 2016, pp. 191-205
DOI: 10.1615/InterfacPhenomHeatTransfer.2017020238
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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.

CITADO POR
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