小型高速流路を用いたマイクロバブルに関する実験的研究

概要

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Using a small high-speed water tunnel (HSWT), we experimentally studied the drag reduction characteristics of microbubbles. We examined the data obtained and adjusted it to make it more reliable. Then using the adjusted data, we evaluated the amount of friction reduction obtained by using microbubbles and attempted to identify the main factor in how they reduce friction. We did this by comparing how the different conditions of the bubbles affected their skin friction. In this paper, we explain how we adjusted the data, describe how we modified the data using the wall effect, and discuss the data uncertainty. We also speculate about the main factor in friction reduction. By comparing the results of two kinds of bubble generation, porous plate injection and array hole plate injection, we estimated the quantitative relation between the void fraction near the bubble wall and the reduction in friction on the skin. We compared injection in seawater with that in tap water and found although the bubbles were smaller in seawater, there was almost no difference in friction reduction. Downstream, the bubbles were still smaller in seawater.
社団法人日本船舶海洋工学会の論文
2003-09-25