微細気泡を含む乱流自然対流の流動および熱伝達特性(熱工学,内燃機関,動力など)

概要

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We investigate experimentally flow and heat transfer characteristics of a turbulent natural convection flow with sub-millimeter bubbles along a vertical heated plate. Thermocouples and a particle tracking velocimetry technique are used for temperature and velocity measurements, respectively. The heat transfer deterioration occurs at a low bubble flow rate (33mm^3/s), while the heat transfer enhancement occurs at another bubble flow rate (56mm^3/s). For higher bubble flow rate, the ratio of the heat transfer coefficient with bubble injection to that without injection ranges from 1.2 to 1.3. It is considered from velocity measurements that this heat transfer enhancement originates from both the activation of large-scale eddies due to bubbles and the advection effect due to bubbles.
一般社団法人日本機械学会の論文
2009-09-25