N2 - The article presents detailed two-phase adiabatic pressure drops data for refrigerant R134a. Study cases have been set for a mass flux varying from 200 to 400 kg/m2s, at the saturation temperature of 19.4°C. Obtained experimental data was compared with the available correlations from the literature for the frictional pressure drop during adiabatic flow. Influence of mixture preparation on pressure drop was investigated, for varying inlet subcooling temperature in the heated section. The flow patterns have also been obtained by means of a high-speed camera placed in the visualization section and compared with literature observations. L1 - http://czasopisma.pan.pl/Content/105649/PDF/06_paper.pdf L2 - http://czasopisma.pan.pl/Content/105649 PY - 2017 IS - No 3 EP - 118 DO - 10.1515/aoter-2017-0018 KW - adiabatic flow KW - frictional pressure drop KW - two-phase flow KW - flow pattern map KW - R134a A1 - Muszyński, Tomasz A1 - Andrzejczyk, Rafał A1 - Dorao, Carlos A. PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences DA - 2017 T1 - Investigations on mixture preparation for two phase adiabatic pressure drop of R134a flowing in 5 mm diameter channel SP - 101 UR - http://czasopisma.pan.pl/dlibra/publication/edition/105649 T2 - Archives of Thermodynamics