TY - JOUR
T1 - Two-phase frictional pressure drop in small rectangular channels
AU - Chen, Ing Youn
AU - Chen, Yi Min
AU - Liaw, Jane Sunn
AU - Wang, Chi-Chuan
PY - 2007/10/1
Y1 - 2007/10/1
N2 - This study presents single-phase and two-phase frictional pressure drop data in three rectangular channels with channel width of 3, 6 and 9 mm, and a fixed gap of 3 mm. Adiabatic flows of air-water mixtures are tested at mass flux of 100-700 kg/m2 s and gas quality ranging from 0.001 to 0.8. The single-phase friction factors agree satisfactorily with the predictions of laminar and turbulent flows. The two-phase frictional pressure drop data are compared to predictions of homogeneous and Chisholm method, Wambsganss and Ide-Fukano correlations. It is found that none of the existing methods or correlations can predict the two-phase pressure gradient in rectangular channels satisfactorily. A modified C factor of Chisholm method considering the effect of aspect ratio is proposed from the empirical fit with the data sets of Wambsganss et al., Ide-Fukano, and this study. The corresponding mean deviations of the proposed correlation against the datasets are 24.99%, 10.83% and 10.73%, respectively. This correlation is applicable in wide rages of mass flux (50 < G < 700 kg/m2 s), gas quality (0.001 < x < 0.95), Martinelli parameter (0.05 < X < 20) and aspect ratio (0.1 < A < 1.0).
AB - This study presents single-phase and two-phase frictional pressure drop data in three rectangular channels with channel width of 3, 6 and 9 mm, and a fixed gap of 3 mm. Adiabatic flows of air-water mixtures are tested at mass flux of 100-700 kg/m2 s and gas quality ranging from 0.001 to 0.8. The single-phase friction factors agree satisfactorily with the predictions of laminar and turbulent flows. The two-phase frictional pressure drop data are compared to predictions of homogeneous and Chisholm method, Wambsganss and Ide-Fukano correlations. It is found that none of the existing methods or correlations can predict the two-phase pressure gradient in rectangular channels satisfactorily. A modified C factor of Chisholm method considering the effect of aspect ratio is proposed from the empirical fit with the data sets of Wambsganss et al., Ide-Fukano, and this study. The corresponding mean deviations of the proposed correlation against the datasets are 24.99%, 10.83% and 10.73%, respectively. This correlation is applicable in wide rages of mass flux (50 < G < 700 kg/m2 s), gas quality (0.001 < x < 0.95), Martinelli parameter (0.05 < X < 20) and aspect ratio (0.1 < A < 1.0).
KW - C factor of Chisholm type correlation
KW - Rectangular channel
KW - Two-phase friction multiplier
KW - Two-phase frictional pressure drop
UR - http://www.scopus.com/inward/record.url?scp=34548757830&partnerID=8YFLogxK
U2 - 10.1016/j.expthermflusci.2007.01.005
DO - 10.1016/j.expthermflusci.2007.01.005
M3 - Article
AN - SCOPUS:34548757830
VL - 32
SP - 60
EP - 66
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
SN - 0894-1777
IS - 1
ER -