Effects of Electrostatic Forces on Drop Collision and Coalescence in Air

Plumlee, Hubert R.

doi:10.21236/ad0608382

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Electrostatic Drop Acceleration1

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1967

2018

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Cited by 7 publications

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“…Woods' experiment neglects a much larger effect that can be produced by the presence of an average electric field, one not present in his experiment. Plumlee [1964] calculates the enhanced coalescence for various values of drop charge and electric field but does not relate these values to those expected in clouds due to turbulent stresses.…”

Section: Electrostatic Drop Accelerationmentioning

confidence: 99%

Enhanced drop coalescence by electric fields in equilibrium with turbulence

Colgate¹

1967

J. Geophys. Res.

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The stress due to an electric field in a cloud results in an unstable hydrostatic equilibrium, and so only a turbulent kinetic energy stress will lead to steady state. The magnitude of turbulence zXu2/2 for an eddy size x is related to the field energy density E'ø/8•r by the Kolmogorov spectrum, and an eddy size x --• 100 meters is predicted for the initiation of lightning discharges. The charge separation required to give this breakdown electric field results in an average drop charge of 9 X 10 -• esu and a relative acceleration between positive and negative drops of 15 times gravity. This is sufficient to ensure rapid coalescence throughout most of the condensation drop spectrum. ELECTROCONVECTION Several experimental and theoretical studies have been made of the interaction of electro-

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Section: Electrostatic Drop Accelerationmentioning

confidence: 99%