TY - JOUR
T1 - Régimes d'écoulement diphasique lors de de la condensation de R-134a à faible flux massique dans des microcanaux rectangulaires
AU - Vanderputten, Michael A.
AU - Jacob, Tabeel A.
AU - Sattar, Maria
AU - Ali, Nouman
AU - Fronk, Brian M.
N1 - Funding Information:
Ms. Maria Sattar and Mr. Nouman Ali participated in this project as visiting scholars funded by USAID through the U.S.-Pakistan Centers for Advanced Studies in Energy program, for whose support we gratefully acknowledge. The authors also acknowledge the work of Mr. Michael Polander in developing software tools for assisting in data acquisition and analysis.
Publisher Copyright:
© 2017 Elsevier Ltd and IIR
PY - 2017/12
Y1 - 2017/12
N2 - 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−2s−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.
AB - 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−2s−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.
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U2 - 10.1016/j.ijrefrig.2017.08.021
DO - 10.1016/j.ijrefrig.2017.08.021
M3 - Article
AN - SCOPUS:85030543349
SN - 0140-7007
VL - 84
SP - 92
EP - 103
JO - International Journal of Refrigeration
JF - International Journal of Refrigeration
ER -