TY - JOUR
T1 - On flow boiling of R-1270 in a small horizontal tube
T2 - Flow patterns and heat transfer
AU - de Oliveira, Jeferson Diehl
AU - Copetti, Jacqueline Biancon
AU - Passos, Julio Cesar
AU - van der Geld, Cees W.M.
PY - 2020/9
Y1 - 2020/9
N2 - An experimental study was performed to investigate both flow patterns and heat transfer during flow boiling of propylene (R-1270) at a saturation temperature of 25 °C in a small circular tube with an inner diameter of 1.0 mm. The heat flux was varied from 5 to 60 kW/m2 and the mass flux ranged from 240 up to 480 kg/m2 s, with vapor quality ranging from 0.01 to 0.99. Five flow patterns were identified: plug flow, slug flow, churn flow, wavy- and (smooth) annular flow. The influence of the heat flux, mass flux, vapor quality and flow pattern on the heat transfer coefficient are quantified and analyzed. The new experimental heat transfer coefficients were compared with predictions of correlations found in literature and recommendations are presented.
AB - An experimental study was performed to investigate both flow patterns and heat transfer during flow boiling of propylene (R-1270) at a saturation temperature of 25 °C in a small circular tube with an inner diameter of 1.0 mm. The heat flux was varied from 5 to 60 kW/m2 and the mass flux ranged from 240 up to 480 kg/m2 s, with vapor quality ranging from 0.01 to 0.99. Five flow patterns were identified: plug flow, slug flow, churn flow, wavy- and (smooth) annular flow. The influence of the heat flux, mass flux, vapor quality and flow pattern on the heat transfer coefficient are quantified and analyzed. The new experimental heat transfer coefficients were compared with predictions of correlations found in literature and recommendations are presented.
KW - Flow boiling
KW - Flow patterns
KW - Heat transfer
KW - Horizontal tube
KW - Minichannel
KW - Propylene
UR - http://www.scopus.com/inward/record.url?scp=85086168447&partnerID=8YFLogxK
U2 - 10.1016/j.applthermaleng.2020.115403
DO - 10.1016/j.applthermaleng.2020.115403
M3 - Article
AN - SCOPUS:85086168447
VL - 178
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
SN - 1359-4311
M1 - 115403
ER -