Convective boiling heat transfer was experimentally investigated for a new fluid flowing in horizontal mini-channels in the present study. The experiments were performed with fluid inlet subcooled condition for two single mini-channels of the same hydraulic diameter of 1.4 mm and different aspect ratios. Local heat transfer coefficients were measured in two-phase flow for low heat flux ranging from 5 to 18 kW/m~(2) and mass flux from 100 to 300 kg/m~(2)s. Flow patterns were observed by using a gigabit ethernet camera (mounted on a stereoscopic microscope) through a visualization window placed in one wall of the test sections. The results suggest that the hydraulic diameter is not the single parameter to take into account when the heat transfer coefficient is compared to data of other studies.
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