Experimental And Computational
Investigation Of Kinematic Mixing In
A Periodically Driven Cavity
Author(s)
S. Santhanagopalan, A. P. Deshpande & S. Pushpavanam
Abstract
Mixing of fluids is important in many industrial processes. In this paper we
discuss the process of kinematic mixing in Newtonian fluid and quantify the
intensity of mixing. A cavity with a periodically driven lid was chosen for the
experimental and numerical analysis. It is shown that the system behavior
depends on two dimensionless parameters, the geometric parameter (Af) and the
Stokes number (St). The mixing is quantified by the Planar Laser Induced
Fluorescence (PLIF) technique using Rhodamine-B as the dye. Here the emitted
fluorescent light intensity was related to the concentration of the dye present in
the system. The extent of mixing was determined by calculating the deviation of
intensity fluctuations. In addition, numerical analysis using the Particle
Separation approach based on the calculation of stretch rates were done and
applied to study the effect of two dimensionless parameters on mixing.
Keywords: mixing, periodically-driven cavity, Planar Laser Induced
Fluorescence, stretching.
1 Introduction
Mixing is an important feature in many chemical processes. In a chemical reactor
a reaction between two or more reactants can occur only when they mix with
each other. Chien et al. [1] studied qualitative laminar mixing in a twodimensional
cavity under different configurations based on the motion of the
walls. They used material line and blob deformation for their analysis. They
found that efficiency of mixing depends strongly on the frequency of oscillation
of the walls and reported an optimum value of frequency, which produces best
Keywords
mixing, periodically-driven cavity, Planar Laser Induced
Fluorescence, stretching.
Related Book
Other papers in this volume
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