Effects of viscosity ratio on droplet-laden isotropic turbulence

Abstract eng:
We performed direct numerical simulation (DNS) of droplet-laden isotropic turbulence. We released 3130 non-evaporating droplets of diameter approximately equal to the Taylor lengthscale (corresponding to 5% droplet volume fraction) in decaying isotropic turbulence at initial Taylor-scale Reynolds number Re; : 83. We studied four cases: one single-phase case and three droplet-laden cases in which we varied the droplet- to carrier-fluid viscosity ratio (1 3 ,ad /,ac S 100). We first derived the turbulence kinetic energy (TKE) equations for the two-fluid, carrier-fluid and droplet-fluid flow. This allows us to explain the pathways for TKE exchange between the turbulent flow of the carrier fluid and the flow inside the droplet. Then, we analyze the effects of varying [id/[LC on the turbulent kinetic energy budget of the carrier fluid, the droplet fluid and the two fluids, and, finally, we explain the underlying physical mechanisms for their modulation.

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