TED-AJ03-421 FLOW AND HEAT TRANSFER CHARACTERISTICS OF TORNADO-LIKE SWIRLING FLOW
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概要
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A tornado-like swirling flow has been more prospective for effective local ventilating from the room floor where polluted air and dust arise, and for local heat transfer control without diffusing the heat to the surrounding area. A relatively-stable axisymmetrical tornado-like vortex is generated in a water tank by a vertically-uniform swirl from four cornered poles with water nozzles. The flow structure is investigated experimentally by the visualization approach, PTV, and LDV. An overall flow structure of the tornado-like vortex has been categorized into three regions : the outer free vortex region, the inflow layer (the Ekman boundary layer), and the vortex tube. The present tornado-like swirling flow also agrees qualitatively with this flow structure. In the free vortex region, the tangential velocity distribution shows a Rankine-like vortex and has good agreement with an approximate formula, which is characterized by the radius and the maximum tangential velocity of the forced vortex. A numerical analysis using an axisymmetrical laminar flow model is carried out to investigate the structure of the tornado-like swirling flow. To eliminate the effect of swirl supplying methods, a virtual cylindrical surface of the radius R_<out>, where an axisymmetrical flow is established, is considered. Defining the Reynolds number Re based on the flow rate and the swirl Reynolds number Re_s [figure] based on the circulation at the virtual surface, all experimental and computational data are well-arranged by these quantities. As a result, flow characteristics of the tangential velocity profile in the free vortex region of this swirling flow are estimated as follows : the radius of the forced vortex in proportion to (Re_s)^<-0.5>; the maximum tangential velocity to Re^<0.77> (Re_s)^<0.2>; the tangential velocity ratio to Re^<-1.25> (Re_s)^<0.5>. The flow structure in the Ekman boundary layer is characterized by the tangential velocity profile described as above in the free vortex region, and the characteristic scale b defined as the height where the radial velocity is half its maximum value. The profile of the Ekman boundary layer thickness is estimated as 1.7b. Additionally, heat transfer characteristics of the heated plate with uniform heat flux located on the bottom surface of the tornado-like vortex are investigated experimentally. The forced convective heat transfer of the tornado-like swirling flow is handled as almost same as the laminar forced convective heat transfer on a flat plate, by using the maximum radial velocity component in the Ekman boundary layer. [figure]
- 一般社団法人日本機械学会の論文
著者
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Suzuki Yuji
Department Of Public Health And Environmental Medicine Jikei University School Of Medicine
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Inoue Takayoshi
Department Of Mechanical Sciences And Engineering Tokyo Institute Of Technology
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Inoue Takayoshi
Department Of Aeronautics And Astronautics University Of Tokyo
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Suzuki Yuji
Department Of Health Sciences School Of Health And Social Services Saitama Prefectural University
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Suzuki Yuji
Department Of Mechanical Sciences And Engineering Tokyo Institute Of Technology
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Suzuki Yuji
Department Of Astronomy Kyoto University
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SUZUKI Yuji
Department of Agriculture, Graduate School of Agricultural Science, Tohoku University
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