Thermal Structure of Turbulent Stagnating Opposed Jets with Different Temperature

Fluctuating temperature has been measured using a laser Rayleigh scattering technique along a centerline of turbulent stagnating opposed jets (cold jet velocity : 2m/s) with different temperatures up to about 400°C. The temperature signals show that the temperature fluctuation is characterized by sp...

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Bibliographic Details
Published inNihon Kikai Gakkai rombunshuu. B hen Vol. 63; no. 615; pp. 3634 - 3640
Main Authors UEDA, Toshihisa, KAKIDA, Shingo, YOSHIMURA, Hidenori, MIZOMOTO, Masahiko
Format Journal Article
LanguageJapanese
Published The Japan Society of Mechanical Engineers 25.11.1997
Subjects
Heat exchangers
Heat transfer
Laminar Flow
Laser applications
Rayleigh scattering
Temperature measurement
Thermal effects
Turbulence
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Summary:Fluctuating temperature has been measured using a laser Rayleigh scattering technique along a centerline of turbulent stagnating opposed jets (cold jet velocity : 2m/s) with different temperatures up to about 400°C. The temperature signals show that the temperature fluctuation is characterized by spike type fluctuations with a sharp increase or decrease in temperature between hot and cold jets. This indicates that the temperature fluctuation is mainly attributed to the large-scale fluctuations of the boundary between the hot and cold jets. Profiles of mean temperature and rms value of fluctuating temperature can be normalized using a similarity parameter based on the bulk strain rate, characteristic intensity and scale of the turbulence when the temperature difference is less than 200°C.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0387-5016
1884-8346
DOI:10.1299/kikaib.63.3634