Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 12, 2019 - October 13, 2019
We investigate experimentally natural convection heat transfer between vertical parallel plates in water with bubble injection. The heat transfer coefficient with bubble injection increases by approximately 20 % when a vertical unheated plate is placed near a vertical heated plate. Near the heated wall, the concentration and rise velocity of bubbles are higher with the unheated plate than without the plate. In addition, for the case with the unheated plate, a large-sized vortex does not appear. Hence, we speculate that for the case with the unheated plate, upward liquid flow induced by bubbles at higher speeds makes a major contribution to the heat transfer enhancement by bubble injection.
