Abstract
The effects of micro-bubble injection on the forced convection heat transfer of laminar duct flow are experimentally investigated with the temperature measurements using the thermocouples. Hydrogen bubbles generated with electrolysis are adopted as the micro-bubbles. The bubble diameter ranges from 200μm to 500μm. The experimental results shows that the heat transfer coefficient with the micro-bubble injection is up to 1.6 times higher than that without the injection and that the heat transfer coefficient increases with the bubble flow rate and the stream wise direction.
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