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EXPERIMENTAL INVESTIGATION OF EDDY DIFFUSIVITY IN A REACTIVE LIQUID JET

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A gradient diffusion model for reactive scalar is experimentally investigated in a planar liquid jet with a second-order chemical reaction A + B  R. Reactant A is premixed into a jet flow, and reactant B is premixed into an ambient flow. Concentrations of reactive species and streamwise velocity are simultaneously measured by using an optical fiber probe based on the light absorption spectrometry and I-type hot-film anemometry. The eddy diffusivities of reactive species are calculated from the mean concentrations and the turbulent mass fluxes of reactive species. The results show that the eddy diffusivity of reactant A becomes small due to the chemical reaction. It is also found that the effects of the chemical reaction on the eddy diffusivity depend on the chemical reaction rate.

Author(s):

Tomoaki Watanabe    
Nagoya University
Japan

Yasuhiko Sakai    
Nagoya University
Japan

Kouji Nagata    
Nagoya University
Japan

Osamu Terashima    
Nagoya University
Japan

Yasumasa Ito    
Nagoya University
Japan