水平線熱源からの乱流プルームの時間依存温度特性および乱流遷移

概要

論文の詳細を見る
The visualized plume, time record of temperature, and fluctuation intensity are elucidated in the transitional and turbulent regions of the plume. The frequency of the visualized vortex in the turbulent region agrees well with the swaying frequency in the laminar region. Time-record characteristics on the midplane and at the given height are determined. The transitional region is divided into the initial and final transitional regions at Gr_x=7.52×10^8. The fluctuation intensity on the midplane in the lamiar, initial transitional, final transitional, and turbulent regions can be approximated by σ/(Q/λPr)=3.17×10^<-3>Gr_x^<-1/30>, σ/(Q/λPr)=3.17×10^<-3>Gr_x^<-1/30>, σ/(Q/λPr)=4.00×10^4Gr_x^<-5/6>, and σ/(Q/λPr)=1.12×10^3Gr_x^<-2/3>. The fluctuation intensity at a given height for Q>27.8W/m shows self-preservation in the turbulent state on the midplane.
一般社団法人日本機械学会の論文
1993-02-25