%0 Journal Article %A KHATUA, AJIT %A Kumar, Parmanand %A Singh, Hari Narayan %D 2014 %I Begell House %K rough surface, two-phase flow, structured roughness and condensation enhancement hydrodynamics %N 6 %P 425-438 %R 10.1615/JEnhHeatTransf.2015012442 %T PRESSURE DROP IN R-245FA CONDENSATION IN TUBES FITTED WITH COILED-WIRE INSERTS %U https://www.dl.begellhouse.com/journals/4c8f5faa331b09ea,7303ba965d07526a,39a138dc217ae99e.html %V 21 %X This study examines pressure drop during condensation of R-245fa pure vapor inside two separate horizontal coaxial double-pipe test sections with coiled-wire inserts assembled in series. For each inserted tube and the plain tube, data were collected for mass fluxes in the range of 100 to 250 kg/m2s in increments of 50 kg/m2s for vapor qualities ranging from 0.1 to 0.9. It was observed that the pressure drop inside a horizontal tube is a complex function of vapor quality, mass velocity, and coil pitch, and in a low vapor quality region. The highest pressure drop ratio was 13.33 for a coil pitch of 3.0 mm at a refrigerant mass flux of 150 kg/m2s. %8 2015-10-22