Analysis of experimental data for the nucleation rate of water droplets

2006 ◽  
Vol 125 (4) ◽  
pp. 044505 ◽  
Author(s):  
Dimo Kashchiev
Keyword(s):  
Experimental Data ◽  
Nucleation Rate ◽  
Water Droplets

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 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 nucleation of NAD and NAT in liquid stratospheric aerosols: insufficient to explain denitrification

2002 ◽  
Vol 2 (3) ◽  
pp. 669-687 ◽  
Author(s):  
D. A. Knopf ◽  
T. Koop ◽  
B. P. Luo ◽  
U. G. Weers ◽  
T Peter
Keyword(s):  
Experimental Data ◽  
Nitric Acid ◽  
Nucleation Rate ◽  
Homogeneous Nucleation ◽  
Particle Production ◽  
Rate Coefficients ◽  
The Arctic ◽  
Linear Extrapolation ◽  
Acid Hydrate ◽  
Stratospheric Clouds

Abstract. The nucleation of NAD and NAT from HNO3/H2O and HNO3/H2O/H2SO4 solution droplets is investigated both theoretically and experimentally with respect to the formation of polar stratospheric clouds (PSCs). Our analysis shows that homogeneous NAD and NAT nucleation from liquid aerosols is insufficient to explain the number densities of large nitric acid containing particles recently observed in the Arctic stratosphere. This conclusion is based on new droplet freezing experiments employing optical microscopy combined with Raman spectroscopy. The homogeneous nucleation rate coefficients of NAD and NAT in liquid aerosols under polar stratospheric conditions derived from the experiments are < 2 x 10-5 cm-3 s-1 and < 8 x 10-2 cm-3 s-1 , respectively. These nucleation rate coefficients are smaller by orders of magnitude than the value of ~ 103 cm-3 s-1 used in a recent denitrification modelling study that is based on a linear extrapolation of laboratory nucleation data to stratospheric conditions (Tabazadeh et al., Science, 291, 2591--2594, 2001). We show that this linear extrapolation is in disagreement with thermodynamics and experimental data and, therefore, must not be used in microphysical models of PSCs. Our analysis of the experimental data yields maximum hourly production rates of nitric acid hydrate particles per cm3 of air of about 3 x 10-10 cm-3 h-1 under polar stratospheric conditions. Assuming PSC particle production to proceed at this rate for two months we arrive at particle number densities of < 5 x 10-7 cm-3, much smaller than the value of ~ 10-4 cm-3 reported in recent field observations. This clearly shows that homogeneous nucleation of NAD and NAT from liquid supercooled ternary solution aerosols cannot explain the observed polar denitrification.

scholarly journals Hydrate nucleation and growth on water droplets acoustically-levitated in high-pressure natural gas

2019 ◽  
Vol 21 (39) ◽  
pp. 21685-21688 ◽  
Author(s):  
Kwanghee Jeong ◽  
Peter J. Metaxas ◽  
Joel Chan ◽  
Temiloluwa O. Kuteyi ◽  
Zachary M. Aman ◽  
...  
Keyword(s):  
High Pressure ◽  
Natural Gas ◽  
Nucleation Rate ◽  
Water Droplet ◽  
Hydrate Formation ◽  
Nucleation And Growth ◽  
Acoustic Levitation ◽  
Water Droplets ◽  
Quantitative Measurements ◽  
Formation Probability

We present the first quantitative measurements of hydrate formation probability, nucleation rate and growth on a water droplet suspended within a high pressure natural gas by acoustic levitation.

Underpotential – Overpotential Phase Transformation Phenomena in Copper Deposition Processes on Glassy Carbon

1997 ◽  
Vol 481 ◽  
Author(s):  
T. A. Arzhanova
Keyword(s):  
Experimental Data ◽  
Glassy Carbon ◽  
Nucleation Rate ◽  
Three Dimensional ◽  
Carbon Surface ◽  
Copper Electrodeposition ◽  
Initial State ◽  
Cathodic Overpotential ◽  
Current Transients ◽  
Copper Nucleation

ABSTRACTThe initial stages of copper electrodeposition on glassy carbon were studied from a solution of 1 M CuSO4 in 0.5 M H2SO4 by the methods of potentiostatic current transients and pulse experiments. The experimental data were analyzed according to the theory of potentiostatic current transients for three-dimensional multiple nucleation with diffusion controlled growth. The theory was found to be in good agreement with experimental data for instantaneous copper nucleation in the cathodic overpotential range η = −0.18 – −0.40 V. It is shown that in case of progressive nucleation at η ≤ −0.16 V, this theory can be used only for trend analysis of copper nucleation process parameters. An important influence of the initial state of glassy carbon surface on the nucleation rate was found determined by the underpotential. It is shown that the dependence of nucleation rate on the underpotential is inadequate and is determined by cathodic overpotential.

Heterogeneous nucleation capability of conical microstructures for water droplets

RSC Advances ◽  
2015 ◽  
Vol 5 (2) ◽  
pp. 812-818 ◽  
Author(s):  
Wei Xu ◽  
Zhong Lan ◽  
Benli Peng ◽  
Rongfu Wen ◽  
Xuehu Ma
Keyword(s):  
Free Energy ◽  
Nucleation Rate ◽  
Heterogeneous Nucleation ◽  
Energy Barrier ◽  
Free Energy Barrier ◽  
Water Droplets

Micro cavities with narrower cone angles can reduce the free energy barrier and improve the nucleation rate of water droplets.

Modeling Recrystallization in Al Alloys: Investigation of Nucleation at Cube Bands

2012 ◽  
Vol 715-716 ◽  
pp. 455-460 ◽  
Author(s):  
Olga Sukhopar ◽  
Günter Gottstein
Keyword(s):  
Experimental Data ◽  
Nucleation Rate ◽  
Material Properties ◽  
Cube Texture ◽  
Al Alloys ◽  
Scientific Interest ◽  
Annealed Material ◽  
Cold Rolled ◽  
The Right ◽  
Good Agreement

In the present study, a modified cellular automaton CORe (Cellular Operator for Recrystallization) was used to predict the recrystallization (RX) texture and microstructure of 70% cold rolled commercial AA8079L alloy at 300°C. The nucleation of the Cube orientation is of considerable scientific interest since the Cube texture component influences significantly the anisotropy of material properties. Experimental data collected during this investigation were used for subsequent modeling. By studying the annealed material by EBSD, an average nucleation rate at Cube bands was established and used in the model. The simulated microstructure reveals, in general, good agreement with experiment. The texture prediction shows the right tendency, but the modeled intensity of the Cube texture is about 2 times smaller than in experiment.

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