scholarly journals Dependence of homogeneous crystal nucleation in water droplets on their radii and its implication for modeling the formation of ice particles in cirrus clouds

2017 ◽  
Vol 19 (30) ◽  
pp. 20075-20081 ◽  
Author(s):  
Yuri S. Djikaev ◽  
Eli Ruckenstein
Keyword(s):  
Nucleation Rate ◽  
Ice Nucleation ◽  
Cirrus Clouds ◽  
Crystal Nucleation ◽  
Water Droplets ◽  
Ice Particles ◽  
Homogeneous Crystal

Dependence of the ice-nucleation-rate in water droplets on their radii and temperature is determined by taking into account volume-based and surface-stimulated modes.

scholarly journals Homogeneous Ice Nucleation Rate in Water Droplets

2018 ◽  
Vol 122 (40) ◽  
pp. 22892-22896 ◽  
Author(s):  
Jorge R. Espinosa ◽  
Carlos Vega ◽  
Eduardo Sanz
Keyword(s):  
Nucleation Rate ◽  
Ice Nucleation ◽  
Water Droplets

scholarly journals On the ice-nucleating potential of warm hydrometeors in mixed-phase clouds

2021 ◽  
Vol 21 (1) ◽  
pp. 561-575
Author(s):  
Michael Krayer ◽  
Agathe Chouippe ◽  
Markus Uhlmann ◽  
Jan Dušek ◽  
Thomas Leisner
Keyword(s):  
Nucleation Rate ◽  
Flow Simulation ◽  
Ice Nucleation ◽  
Order Effects ◽  
High Fidelity ◽  
Simulation Techniques ◽  
Cloud Models ◽  
Ice Particles ◽  
Ice Concentration ◽  
Mixed Phase Clouds

Abstract. The question as to whether or not the presence of warm hydrometeors in clouds may play a significant role in the nucleation of new ice particles has been debated for several decades. While the early works of Fukuta and Lee (1986) and Baker (1991) indicated that it might be irrelevant, the more recent study of Prabhakaran et al. (2020) suggested otherwise. In this work, we attempt to quantify the ice-nucleating potential using high-fidelity flow simulation techniques around a single hydrometeor and use favorable considerations to upscale the effects to a collective of ice particles in clouds. While we find that ice nucleation may be significantly enhanced in the vicinity of a warm hydrometeor and that the affected volume of air is much larger than previously estimated, it is unlikely that this effect alone causes the rapid enhancement of ice nucleation observed in some types of clouds, mainly due to the low initial volumetric ice concentration. Furthermore, it is demonstrated that the excess nucleation rate does not primarily depend on the rate at which cloud volume is sampled by the meteors' wakes but is rather limited by the exposure time of ice-nucleating particles to the wake, which is estimated to be of the order of few microseconds. It is suggested to further investigate this phenomenon by tracking the trajectories of ice-nucleating particles in order to obtain a parametrization which can be implemented into existing cloud models to investigate second-order effects such as ice enhancement after the onset of glaciation.

Photolytic Inactivation of Ice-Forming Silver Iodide Nuclei

1951 ◽  
Vol 32 (4) ◽  
pp. 132-135 ◽  
Author(s):  
Edward C. Y. Inn
Keyword(s):  
Surface Structure ◽  
Silver Iodide ◽  
Chemical Nature ◽  
Ice Nucleation ◽  
Water Droplets ◽  
Ice Particles ◽  
Physico Chemical ◽  
Structure Sensitive ◽  
Photolytic Decomposition

Photolytic decomposition of silver-iodide crystals has been observed when the crystals were exposed to light of wave lengths less than 4300Å, as indicated by darkening of the exposed crystals. Qualitative observations indicate exposed silver iodide crystals undergo reversible photolysis, although the exact conditions under which this takes place is not well understood. When silver iodide nuclei were similarly exposed to light, the ability to form ice particles, when injected into a cloud of super-cooled water droplets, was found to be essentially destroyed. It is believed that, as a result of photolysis of the exposed silver iodide nuclei, the physico-chemical nature of surface of the nuclei has been altered to minimize effectively the surface-structure sensitive process of ice nucleation.

scholarly journals Heterogeneous versus homogeneous crystal nucleation of hard spheres

Soft Matter ◽  
2019 ◽  
Vol 15 (47) ◽  
pp. 9625-9631 ◽  
Author(s):  
Jorge R. Espinosa ◽  
Carlos Vega ◽  
Chantal Valeriani ◽  
Daan Frenkel ◽  
Eduardo Sanz
Keyword(s):  
Nucleation Rate ◽  
Heterogeneous Nucleation ◽  
Cell Walls ◽  
Homogeneous Nucleation ◽  
Hard Spheres ◽  
Crystal Nucleation ◽  
Experimental Measurements ◽  
Homogeneous Crystal

Heterogeneous nucleation at the cell walls may at least partly explain the reported discrepancy between experimental measurements and simulation estimates of the homogeneous nucleation rate.

Heterogeneous Ice Nucleation Rate Coefficient of Water Droplets Coated by a Nonadecanol Monolayer

2007 ◽  
Vol 111 (5) ◽  
pp. 2149-2155 ◽  
Author(s):  
B. Zobrist ◽  
T. Koop ◽  
B. P. Luo ◽  
C. Marcolli ◽  
T. Peter
Keyword(s):  
Nucleation Rate ◽  
Rate Coefficient ◽  
Ice Nucleation ◽  
Water Droplets ◽  
Heterogeneous Ice Nucleation

scholarly journals Impurities and Homogeneous Crystal Nucleation in Aqueous Solutions - An Overview

2019 ◽  
Vol 16 (3) ◽  
pp. 198-208
Author(s):  
C. K. Mahadevan
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Research Group ◽  
Present Author ◽  
Crystal Nucleation ◽  
Nucleation Process ◽  
Nucleation Parameters ◽  
The Past ◽  
Homogeneous Crystal ◽  
Made In

Nucleation process is the most important stage in the formation of a crystal and has attracted the attention of researchers due to its importance in many technological and biological contexts. As the presence of impurities affects the nucleation process significantly, several studies have been made in the past to understand it. In this article is presented an overview of various studies made to understand the effect of soluble impurities on the crystal nucleation parameters of certain important materials in aqueous solution focusing the results reported by the research group of the present author.

Sign in / Sign up

Export Citation Format

Share Document