0106 液相軸対称噴流中のスカラー微分統計量のシュミット数依存性に関する研究(OS1 噴流,後流および剥離流れ現象の探求と技術革新,オーガナイズドセッション)

抄録

The dependence of the scalar derivative statistics on the Schmidt number is investigated experimentally in a liquid axisymmetric jet. Theconcentration of a commercial dye is chosen as a high Schmidt number scalar and temperature is chosen as a low one in this experiment. TheSchmidt number of the diffusing matter is 3,800 and the Prandtl number of temperature is 7. Instantaneous concentration and temperature aremeasured by using a fiber-optic concentration sensor and a cold-film probe, respectively. The measurement results show that the derivativeskewness of scalar decreases and its derivative flatness increases proportional to the turbulent Reynolds number R_λ. In addition, it is alsofound that the derivative skewness of scalar decreases with the increasing of Schmidt number and its derivative flatness is seems to beindependent of Schmidt number.