TY - JOUR
TI - An experimental study on two-phase pressure drop in small diameter horizontal, downward inclined and vertical tubes
AU - Autee Arun
AU - Rao S Srinivasa
AU - Puli Ravikumar
AU - Shrivastava Ramakant
JN - Thermal Science
PY - 2015
VL - 19
IS - 5
SP - 1791
EP - 1804
PT - Article
AB - An experimental study of two-phase pressure drop in small diameter tubes  orientated horizontally, vertically and at two other downward inclinations  of θ= 300 and θ = 600 is described in this paper. Acrylic transparent tubes  of internal diameters 4.0, 6.0, and 8.0 mm with lengths of 400 mm were used  as the test section. Air-water mixture was used as the working fluid.  Two-phase pressure drop was measured and compared with the existing  correlations. These correlations are commonly used for calculation of  pressure drop in macro and mini-microchannels. It is observed that the  existing correlations are inadequate in predicting the two-phase pressure  drop in small diameter tubes. Based on the experimental data, a new  correlation has been proposed for predicting the two-phase pressure drop.  This correlation is developed by modification of Chisholm parameter C by  incorporating different parameters. It was found that the proposed  correlation predicted two-phase pressure drop at satisfactory level.