Authors: K. Mohseni
Affilation: University of Colorado, United States
Pages: 392 - 395
Keywords: vortex, mixing , microfluidics, impulse, universality
A key idea in microscale mixing, where the conventional turbulent mixing is not applicable, is to increase the area of the interface between two fluids. Significant entrainment and consequently mixing during vortex formation works based on the same idea of increasing the interface between two fluids. In this study the previous results by Mohseni et al. [1-4] in universality of vortex formation is extended to optimize microscale mixing or impulse generation. The energy, circulation, and impulse of the optimal vortex rings are calculated by the direct numerical simulation of the Navier-Stokes equations. A discussion of the governing parameters are presented. There are only to nondimensional parameters that governs the vortex pinch off process: the nondimensional energy and the nondimensional circulation. Mixing and impulse generation are also characterized by the value of these nondimensional numbers.
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