Experimental Study of R448A Flow Boiling in a 24-Port Microchannel Tube

•Flow boiling characteristics of the non-azeotropic mixture R448A in a microchannel tube were measured in one pass.•As mass flux or heat flux increased, HTC of R448A increased; when the saturation pressure increased, HTC of R448A decreased.•R448A had a higher HTC than the HFOs and R134a at low quality, but lower HTC at high quality.•The correlations for predicting pressure gradient and heat transfer coefficient were proposed or recommended.