1987 Fiscal Year Final Research Report Summary
Difference Between Active(Heat)-and passive Scalar Diffusions in Thermally Stratified Flow
| Project/Area Number |
61550176
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Thermal engineering
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| Research Institution | National Institute for Environmental Studies |
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Principal Investigator |
UEDA Hiromasa National Institute for Environmental Studies,Section Head, 大気環境部, 室長 (70026186)
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| Co-Investigator(Kenkyū-buntansha) |
MIYAZAKI Takeshi National Institute for Environmental Stidies,Researcher, 大気環境部, 研究員 (50142097)
MITSUMOTO Sigeki National Institute for Environmental Stidies,Researcher, 大気環境部, 研究員 (20109903)
KOMORI Satoru Kyushu University,Associated Professor, 工学部, 助教授 (60127082)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Stratified flow / Scalar diffusion / Active-scalar / Turbulent boundary layer / Burger's turbulence / Fine structure turbulence / 乱流微細構造 / 濃度変動測定 |
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| Research Abstract |
In the thermally stratifed flows temperature fluctuation induces buoyancy force and causes drastic changes in turbulence structure and transport porcesses.When the stratification is extremely stable,for example,it causes a counter-gradient diffusion of heat.However,mass(e.g.diluted pollutant) usually diffuses in the direction of its concentration gradient,even in such a flow field.The purpose of the present study is to make clear experimentally and theoretically the difference between the active-scalar(heat)and passive scalar diffusions.
1.Experimental investigation on scalar diffusion mechanisms:First a simultaneous measuring technique of two-species concentration fluctuations was established,which was besed on the laser-induced luminescence and Mie-scattering and consisted of a line-or area-photodetectory array.Superiority of this technique was confirmed by
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