Two-phase flow regimes of condensing R-134a at low mass flux in rectangular microchannels

Citeable URL: https://ir.library.oregonstate.edu/concern/articles/r494vs35p

Descriptions

Attribute Name	Values
Creator	Vanderputten, Michael A. Jacob, Tabeel A. Sattar, Maria Ali, Nouman Fronk, Brian M.
Abstract	Qualitative two-phase flow regime data are obtained from high-speed visualization of condensing flows of R-134a at mass fluxes from 75 to 150 kg m−2 s−1 and quality from 0.1 to 0.8 in square microchannels (DH = 0.84 mm) cooled from a single side. Superheated R-134a is distributed into multiple parallel microchannels and then partially condensed, using a counterflow water loop, to the desired quality prior to the inlet of a visualization section. This experimental arrangement mitigates the potential for flow maldistribution. Despite very small heat duties, a low uncertainty in the quality in the visualization section is maintained by enforcing a large temperature difference on the water-side (ΔT > 10 K). For all conditions, annular or annular/wavy type flow were observed, with no distinct intermittent flow. Data are compared with flow macro and mini/microchannel maps, which are shown to over predict the occurrence of intermittent or wavy flow.
License	Attribution-NonCommercial-NoDerivatives 4.0 (CC BY-NC-ND 4.0)
Resource Type	Article
DOI	https://doi.org/10.1016/j.ijrefrig.2017.08.021
Date Issued	2017-09-04
Journal Title	International Journal of Refrigeration
Journal Volume	84
Academic Affiliation	Mechanical, Industrial, and Manufacturing Engineering College of Engineering
权利声明	In Copyright
Publisher	Oregon State University
Language	English [eng]