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- Author or Editor: Myron N. Plooster x
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Abstract
Supercooled water droplets in free fall were shattered by shock waves in a laboratory shock tube, and the fragments thus produced were examined for the presence of ice crystals. The experimental results show that the probability of formation of ice crystals by the shattering process is very small. It thus appears improbable that shock waves from lightning strokes or explosive charges can substantially increase the concentrations of ice crystals in a supercooled cloud by this mechanism.
Abstract
Supercooled water droplets in free fall were shattered by shock waves in a laboratory shock tube, and the fragments thus produced were examined for the presence of ice crystals. The experimental results show that the probability of formation of ice crystals by the shattering process is very small. It thus appears improbable that shock waves from lightning strokes or explosive charges can substantially increase the concentrations of ice crystals in a supercooled cloud by this mechanism.
Abstract
No abstract available.
Abstract
No abstract available.
Abstract
A cloud of small supercooled water droplets was subjected to shock waves of reproducible intensity in the laboratory. Nucleation of freezing occurred only when the gas driving the shock waves was cooled to −37C or below by adiabatic expansion and subsequently mixed with the droplet-bearing air. Passage of the shock wave did not produce nucleation of the cloud. Results of a numerical model of a lightning discharge show, in the pressure wave from a lightning discharge, that the degree of cooling by adiabatic expansion is probably too small to produce ice crystals by homogeneous nucleation.
Abstract
A cloud of small supercooled water droplets was subjected to shock waves of reproducible intensity in the laboratory. Nucleation of freezing occurred only when the gas driving the shock waves was cooled to −37C or below by adiabatic expansion and subsequently mixed with the droplet-bearing air. Passage of the shock wave did not produce nucleation of the cloud. Results of a numerical model of a lightning discharge show, in the pressure wave from a lightning discharge, that the degree of cooling by adiabatic expansion is probably too small to produce ice crystals by homogeneous nucleation.
