HYDROCARBONS VAPORIZATION INSIDE A 4 mm ID HORIZONTAL SMOOTH TUBE

摘要

This paper presents new experimental data collected during R600a flow-boiling inside a 4 mm ID horizontalcopper smooth tube. Tests were carried out at 20 °C of saturation temperature, with heat flux ranging from 15to 30 kW m~（−2） and refrigerant mass flux in the range 100–300 kg m~（−2) s~（−1） at increasing vapor quality up toincipient dryout. On the basis of the heat transfer data, the influence of forced convection and nucleate boilingcontributions was investigated. The collected measurements were then used to assess some classical literaturecorrelations. Finally, isobutane heat transfer performance was compared with other hydrocarbons (isobutane,and propylene). These latest measurements were obtained by the same authors under similar workingconditions (Longo et al., 2017).