Heat transfer and pressure drop of film condensation in a horizontal minitube for HFO1234yf refrigerant

•Condensation sequences of HFO1234yf in straight and convergent tubes are explored.•We simulate condensate films to resolve thermal and frictional characteristics.•Convergent design realizes heat transfer coefficient of 12.3 kW/m2 K at 800 kg/m2 s.•Empirical correlations of heat transfer coefficient and pressure drop are tested.•Dobson-Chato, Huang, Freidel correlations suitably estimate thermo-friction factors.