TURBULENT DIFFUSION OF A THREE-DIMENSIONAL WALL JET : lST REPORT, MEAN AND TURBULENT CHARACTERISTICS OF VELOCITY AND TEMPERATURE FIELD

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概要

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• The diffusion of a slightly heated jet issuing from a semi-circular tube into quiescent air along plane wall was studied experimentally. Measurements of instantaneous temperature and three velocity components were made by using a four-element constant-temperature hot-wire probe with digital signal processing. As to time-mean characteristics, the measurements confirm the previous findings that the diffusion in spanwise direction is considerably larger than the one in normal direction in far field. Measurements of turbulence indicate no distinct character in the fluctuations of three velocity components, but it is found that Reynolds stress and turbulent heat flux in spanwise direction are markedly higher than those in normal direction. Three-dimensional mixing-length model is applied to predict Reynolds stress and turbulent heat flux. Though the predicted values in normal direction show good agreement with measurements, the predicted values in spanwise direction are essentially lower than the measured ones.

• 一般社団法人日本機械学会の論文

著者

• Ohashi Hideo

  Faculty Of Agriculture Gifu University

• Koso Toru

  Research Institute Of Industrial Science Kyushu University

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