Some applications of the measurement of concentration in liquids by laser-induced fluorescence

It is well-known that turbulent flows are used for mixing non-homogeneous concentration fields because of their strong spacial transfer properties and their ability to create fine structures associated with strong concentration gradients. If the instantaneous concentration field https://www.w3.org/1998/Math/MathML" display="inline"> C ( x → , t ) is split, as usual, into a mean and a fluctuating value, according to the relation: https://www.w3.org/1998/Math/MathML" display="block"> C ( x → , t ) = C ¯ ( x → , t ) + c ( x → , t ) the efficiency of a turbulent mixing process depends on the characteristic time of decay towards zero of https://www.w3.org/1998/Math/MathML" display="inline"> ∂ C ¯ / ∂ x i and https://www.w3.org/1998/Math/MathML" display="inline"> c ¯ 2 .