A new method for heat transfer coefficient measurements of single-phase fluids during laminar flow in microchannels

•This paper proposes a new method for heat transfer coefficient measurement.•The wall temperatures on the microchannel before and after the heater measured.•The temperature profile simulated with consideration of the axial conduction.•The measured wall temperatures compared to the simulated wall temperatures.•The Nu number in the laminar flow for a microchannel is independent of Re number.