G0501-1-5 垂直粗面管を上昇するマイクロバブルの流動特性(キャビテーション,マイクロバブル)

概要

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The fluid characteristics of vertically upward micro-bubble flow through the rough-surfaced tube were investigated experimentally. An experiment was performed for the Reynolds number in the range of 1000 up to 20000. In our experiment, we measured average void ratio at the outlet of the tube and the frictional pressure loss through the tube of 20mm in ID. The surface wall inside test sections consisted of the tube with no roughness or with roughness. The micro-bubble flow was formed in micro bubbles of almost 60 micrometer in diameter. It was found that the micro-bubble flow can delay laminar-turbulent transition and then the friction factor has minimum value at Re_1=5000, and that the effect of roughness on friction factor has a negligible small, in other words, the friction-reduction effect of the micro-bubble flow is especially effective against roughness.
社団法人日本機械学会の論文
2009-09-12