Article ID: 21-11NK_OA
In order to clarify the effects of different the shape on the boiling thermal-hydraulics characteristics of mini-channels, the observation of flow patterns and measuring pressure drop and boiling heat transfer coefficient in vertically upward flow with a wavy mini-channel have been conducted. The straight mini-channel was also tested with the same hydraulic diameter of 1 mm inside diameter for a comprehensive comparison. Flow patterns in the wavy mini-channel were observed some differences from general flow patterns reported by previous studies of straight mini-channels. The frictional pressure drop of the wavy mini-channel was about two times higher than that of the straight mini-channel. From the results of boiling heat transfer experiments, it was found that the heat transfer coefficient of the wavy mini-channel was different from that of the straight mini-channel at low heat fluxes and increased by a factor of up to 2.5, and that the heat transfer coefficient of the wavy mini channel approached that of the straight mini-channel at high heat fluxes.
