微細気泡注入による層流自然対流場の伝熱促進

概要

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本文データは社団法人日本機械学会の許諾に基づきCiNiiから複製したものであるA micro-bubble injection is one of the most promising techniques of enhancing the heat transfer　for laminar natural convections of liquid. However, flow and heat transfer structures for laminar　natural convections of water with micro-bubbles have not yet been fully understood. The purpose　of this study is to clarify the effects of the micro-bubble injection on the laminar natural convection　of water along a vertical heated plate using thermocouples and a Particle Tracking Velocimetry　(PTV) technique. The experimental results show that the heat transfer coefficients with micro-bubble　injection are higher compared with those without micro-bubble injection as the bubble flow　rate increases or the wall heat flux decreases. It is concluded from the velocity measurements that　the heat transfer enhancement for the laminar natural convection results from the significant　increases in the liquid mean rise velocities and the liquid RMS velocities due to micro-bubble　injection.