Abstract
Decaying grid turbulence is experimentally studied. Three different kinds of surfactants (Alkyltrimethylammonium Chloride and Sodium Salicylate) in which the hydrophobic group lengths are changed as n=14, 16, 18 are used. We confirmed that the decay exponent of velocity fluctuation is -1 at initial period and it is -5/2 at final period. The viscoelastic feature of surfactants is studied by analyzing the bump of turbulence intensity and the PDF shape is analyzed.
