Destruction of preferential accumulation by Lorentz force interactions

Karnik, Aditya and Shrimpton, John (2008) Destruction of preferential accumulation by Lorentz force interactions. 22nd European Conference on Liquid Atomization and Spray Systems (ILASS 2008), Como Lake, Italy. 08 - 10 Sep 2008.

Record type: Conference or Workshop Item (Paper)

Abstract

The effect of electric charge, residing on particles, upon the phenomenon of preferential accumulation is investigated using direct numerical simulations of forced isotropic turbulence. It is well known that particles with a certain range of Stokes numbers preferentially accumulate, or de-mix, due to action of turbulent motion. Here it is shown that charged particles interact with each other through an electric field generated by non-uniformity of particle distribution. This interaction mitigates preferential accumulation at a bulk charge density level that is practically relevant and commensurate with the first few centimetres of a spray plume, the region where non-homogeneous particle concentration typically forms. It is suggested that use of electric charge could be useful in improving mixture preparation for spray combustion applications.

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