Modeling studies on coagulation of charged particles and comparison with experiments

Ghosh, Kunal; Tripathi, S. N.; Joshi, Manish; Mayya, Y. S.; Khan, Arshad; Sapra, B.K.

doi:10.1016/j.jaerosci.2016.11.019

Cited by 23 publications

(16 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The charged particles are constantly interacting with each other resulting in changes in initial charge and size distribution with time. As this is a bipolar interaction, it is expected that charge distribution will be wider than initial distribution with time (Ghosh et al, 2017).…”

Section: Numerical Simulationsmentioning

confidence: 99%

Measurements of Aerosols and Charged Particles On the BEXUS18 Stratospheric Balloon

Brattich¹,

Castillo²,

Giulietti³

et al. 2019

Preprint

View full text Add to dashboard Cite

Abstract. This paper describes the aerosol measurements setup and results obtained during the BEXUS18 stratospheric balloon within the A5-Unibo (Advanced Atmospheric Aerosol Acquisition and Analysis) experiment performed on October 10th, 2014 in northern Sweden (Kiruna). The experimental setup was designed and developed by the University of Bologna with the aim of collecting and analyzing vertical profiles of atmospheric ions and particles together with atmospheric parameters (temperature, relative humidity and pressure) all along the stratospheric ascent of the BEXUS18 stratospheric balloon. Particles size distributions were measured with the MeteoModem Light Optical Aerosol Counter (LOAC) and air ion density was measured with a set of two commercial and portable ion counters. Though the experimental setup was based upon relatively low-cost and light-weight sensors, vertical profiles of all the parameters up to an altitude of about 27 km were successfully collected. The results obtained are useful for elucidating the relationships between aerosols and charged particles between ground level and the stratosphere with great potential in collecting and adding useful information in this field, also in the stratosphere where such measurements are rare. In particular, the equipment detected coherent vertical profiles for particles and ions, with a particularly strong correlation between negative ions and fine particles, possibly resulting from proposed associations between cosmic rays and ions as previously suggested. In addition, the detection of charged aerosols in the stratosphere is in agreement with the results obtained by a previous flight and with simulations conducted with a stratospheric ion-aerosol model. However, further measurements under stratospheric balloon flights equipped with a similar setup are needed to reach general conclusions on such important issues.

show abstract

Section: Numerical Simulationsmentioning

confidence: 99%

Measurements of Aerosols and Charged Particles On the BEXUS18 Stratospheric Balloon

Brattich¹,

Castillo²,

Giulietti³

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

“…In theory, the rate of coagulation is affected by the presence of particle charge. Indeed, calculations reported by Ghosh et al (2017) indicate that charging particles significantly beyond their steady-state charge distribution leads to a demonstrable effect on their rate of coagulation. However, approximations cited by Seinfeld and Pandis (2016, 562-565) indicate this effect for atmospheric aerosols are small.…”

Section: Effect Of Particle Charge On Coagulationmentioning

confidence: 99%

“…For two particles with charge numbers n 1 and n 2 and diameters D p1 and D p2 , respectively, the Brownian coagulation kernel was adjusted by a factor of j e j À 1 [1] to account for coulomb forces, where j ¼ n 1 n 2 e 2 2p 0 ðD p1 þD p2 ÞkT , is the dielectric constant of air, and 0 is the permittivity of free space (Seinfeld and Pandis 2016, 562-565). Unlike Ghosh et al (2017), we ignored electrostatic dispersion effects because, while charges are present, they should not be far from the steady-state bipolar charge distribution and there should not be significantly more charges of one polarity than of the other.…”

Section: Effect Of Particle Charge On Coagulationmentioning

confidence: 99%

Effect of particle charge on aerosol dynamics in Teflon environmental chambers

Charan

Kong

Flagan

et al. 2018

Aerosol Science and Technology

View full text Add to dashboard Cite

The contribution of particle charge to the rate of particle wall deposition has been a persistent source of uncertainty for experiments performed in environmental chambers. By tracking the preferential deposition of positively charged particles; by comparing experiments carried out under standard, humid, and highly statically charged conditions; and by performing two-parameter optimizations for the chamber eddy-diffusion coefficient (k e) and the average magnitude of the electric field (E), the effect of charge on the rate of particle-wall deposition is isolated. A combined experimental and computational method is also developed for determining values for k e and E within a FEP Teflon chamber. To fully account for the effects of charge on particle dynamics in environmental chambers, studies of the effect of air ion concentration on the rate of particle coagulation over a typical 20 h experiment are performed and demonstrated, in general, that particle charge is negligible for characteristic chamber ion concentrations. While the effect of particle charge on aerosol dynamics in an environmental chamber must be addressed for each specific chamber, we demonstrate experimentally that for the Caltech 19 m 3 Environmental Chamber, charge effects on the rate of particle-wall deposition are negligible.

show abstract

“…Also, radiation, charge, and shape effects have not been adequately considered for these reactor safety studies. Notably, aerosol charge distribution has been shown to have a significant effect in the coagulation of particles, particularly for bipolar charge distributions (Ghosh et al, 2017;Palsmeier and Loyalka, 2013).…”

Section: Introductionmentioning

confidence: 99%

Simulation of Multiple-Component Charged Aerosol Evolution

Aguilar

Loyalka

2020

Nuclear Science and Engineering

View full text Add to dashboard Cite

Dedicated to all my dear ones who believed that I could do this and encourage me with their kind words. Especially my wife, my mother, and my brother. And to my meditation teacher, venerable Yuttadhammo Bhikkhu. Without the skill to train the mind this would have not been possible. ii ACKNOWLEDGMENTS First, I would like to thank my advisor Dr. Loyalka for his patience, teachings, guidance, encouragement and support throughout the course of my Ph.D. research. Besides being an expert in his field, he is a kind and generous human being. I would like to thank my committee members: Drs. Mark Prelas, Tushar Ghosh, Robert Tompson and Dabir Viswanath. I appreciate your contributions toward improving and reviewing this work. With especial gratitude to Dr. Prelas who also gave me the opportunity to participate in the project to write the book "Nuclear Batteries and Radioisotopes" where I learned a lot, and to Dr. Tompson who gave me directions about the generation of nanoparticles by spark discharge. It was an honor to be a student at the Nuclear Science and Engineering Institute and learn from these faculty members. I would like to thank the staff of the NSEI, James Bennett and Latricia Vaughn, for all your help, guidance, and support during my time as Ph.D. student. I would like to thank my fellow students who helped me during this time. Especially Matthew Simones who kindly taught me how to use aerosol instrumentation. And Kyle Walton who helped me when I worked in the laboratories. Finally, I would like to acknowledge the support received by the Mexican Consejo Nacional de Ciencia y Tecnología (CONACYT) who provided me with financial support the first four years of my Ph.D. studies and by the federal grant DE-NE0008448, entitled "Am-241 Nuclear Safety and Environmental Interactions" sponsored via the

show abstract

Modeling studies on coagulation of charged particles and comparison with experiments

Cited by 23 publications

References 48 publications

Measurements of Aerosols and Charged Particles On the BEXUS18 Stratospheric Balloon

Measurements of Aerosols and Charged Particles On the BEXUS18 Stratospheric Balloon

Effect of particle charge on aerosol dynamics in Teflon environmental chambers

Simulation of Multiple-Component Charged Aerosol Evolution

Contact Info

Product

Resources

About