水平線熱源からの乱流プルームの時間平均温度特性および乱流遷移

概要

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The time-averaged temperature characteristics of the turbulent transition and turbulent regime of the thermal plume above a line heat source are elucidated experimentally under the condition without meandering. The time-averaged temperature on the midplane in the turbulent and transitional region can be expressed by (T_<cl>-T_∞)/(Q/λPr)=2.81Gr-x^<-1/3> and (T_<Cl>-T_∞)/(Qh(0)/λPr)=2.67×10^2Gr-x^<-1/2>. When the heat rate is larger than 27.8W/m, the turbulent plume shows self-preservation and the temperature at a given height and halfwidth of the plume can be expressed by Gr-x^<1/3>(T-T_∞)/(Q/λPr)=2.81{1 + cos (ξπ/36)}/2 and δ/(λv^2Pr/gβQ)^<1/3>=18.0Gr_x^<2/15>. The plume width increases abruptly in the transitional region.
一般社団法人日本機械学会の論文
1993-02-25