Abstract
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.
