TY - JOUR
T1 - The intermittent and annular flow condensation continuum
T2 - Pressure drops at the microscale
AU - Garimella, Srinivas
AU - Agarwal, Akhil
AU - Fronk, Brian M.
N1 - Publisher Copyright:
© 2016 Elsevier Ltd.
PY - 2016/9/1
Y1 - 2016/9/1
N2 - Frictional pressure drops were measured during condensation of refrigerant R134a in small hydraulic diameter (100 < Dh <160 μm) rectangular (1 < AR <4) channels using a novel technique to accurately determine frictional pressure gradient at small δx. An Annular Flow Factor (AFF) is used to automatically account for the smooth transition between annular and intermittent flow and predict the applicable pressure drop based on a model that accounts for the effects of G, x, Tsat, Dh and AR. The model predicts 95% of the data within ±25%. The relative predominance of the two flow regimes predicted by the AFF is in agreement with findings of Coleman and Garimella (2000, 2003). Constant AFF lines may also be used as transition criteria for the application of intermittent or annular flow based models.
AB - Frictional pressure drops were measured during condensation of refrigerant R134a in small hydraulic diameter (100 < Dh <160 μm) rectangular (1 < AR <4) channels using a novel technique to accurately determine frictional pressure gradient at small δx. An Annular Flow Factor (AFF) is used to automatically account for the smooth transition between annular and intermittent flow and predict the applicable pressure drop based on a model that accounts for the effects of G, x, Tsat, Dh and AR. The model predicts 95% of the data within ±25%. The relative predominance of the two flow regimes predicted by the AFF is in agreement with findings of Coleman and Garimella (2000, 2003). Constant AFF lines may also be used as transition criteria for the application of intermittent or annular flow based models.
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U2 - 10.1016/j.ijmultiphaseflow.2016.03.023
DO - 10.1016/j.ijmultiphaseflow.2016.03.023
M3 - Article
AN - SCOPUS:84964951756
SN - 0301-9322
VL - 84
SP - 129
EP - 144
JO - International Journal of Multiphase Flow
JF - International Journal of Multiphase Flow
ER -