Influence of relative humidity on the aeolian electric field

Xie, Li; Han, Kai

doi:10.1016/j.aeolia.2012.01.002

Cited by 16 publications

(12 citation statements)

References 27 publications

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“…This result has also been verified by other studies (Xie and Han, 2012;Zheng et al, 2014). Dust electrification is very complex due to particle-particle interactions (a nonequilibrium charging process involving a wide range of length and time scales) and particle-turbulence interactions (particle inertia varying over several orders of magnitude…”

supporting

confidence: 74%

“…While water is not necessary for contact electrification (Baytekin et al, 2011a), a variety of studies indicated that such charge separation was strongly dependent 340 on the RH (Esposito et al, 2016;McCarty and Whitesides, 2008;Xie and Han, 2012;Zhang et al, 2017). The proposed reasons for this are twofold: On one hand, the presence of adsorbed water could increase surface conductivity and facilitate the ion or electron transfer (McCarty and Whitesides, 2008); On the other hand, OH − ions in adsorbed surface water could also act as charge carrier (Gu et al, 2013;Lacks and Sankaran, 2011;345 McCarty and Whitesides, 2008).…”

Section: The Physical Mechanisms For Electrification Equilibriummentioning

confidence: 99%

“…Theoretically, there is an electrification equilibrium effect (i.e., * is constant) if ρ and M 10 are linearly correlated at a given ambient temperature and RH (and 200 obviously, nonlinear relationship between them means time-varying * ). Since previous studies (Esposito et al, 2016;Harper and Dufek, 2016;Merrison, 2012;Wiles et al, 2007;Xie and Han, 2012;Zhang et al, 2017;Zheng et al, 2014) suggested that environmental factors such as ambient temperature and RH could considerably affect the intensity of Efields, SLR in this study were performed at a set of given temperature and RH intervals of where coefficient 0 is the fitted intercept, the fitted slope 1 is equal to * , and 1 is a disturbance term. We use the ordinary least squares method to estimate the coefficients of the SLR model (Eq.…”

Section: Regression Analysismentioning

confidence: 99%

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Quantifying the large-scale electrification equilibrium effects in dust storms using field observations at Qingtu Lake Observatory

Zhang¹,

Zheng²

2018

Preprint

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Dust/sand electrification, which is a ubiquitous phenomenon in dust events, has a potentially dramatic effect on dust/sand lifting and transport processes. However, the 15 effect of such electrification is still largely unclear, mainly due to its complexity and sparse observations. Here, we conducted an extensive observational analysis involving mild and severe dust storms with minimum visibility, ranging from ~0.09 to 0.93 km, to assess the electrical properties of airborne dust particles in dust storms. The space charge density has been estimated indirectly based on Gauss's law. Using the wavelet coherence analysis 20 that is a method for evaluating the correlations between two non-stationary time series in the time-frequency domain, we found that the space charge density and dust concentration were significantly correlated over the 10 min timescales that is on the order of the typical integral time scale of atmospheric turbulence. We further presented a simple linear regression (SLR) model to quantify such large timescale correlations and 25 found that there was a significant linear relationship between space charge density and dust concentration at given ambient temperature and relative humidity (RH), suggesting that the estimated mean charge-to-mass ratio of dust particles was expected to remain constant (termed as the equilibrium value * ). nn addition, the influences of ambient temperature and RH on * were evaluated by a multiple linear regression (MLR) model,

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supporting

confidence: 74%

Section: The Physical Mechanisms For Electrification Equilibriummentioning

confidence: 99%

Section: Regression Analysismentioning

confidence: 99%

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Quantifying the large-scale electrification equilibrium effects in dust storms using field observations at Qingtu Lake Observatory

Zhang¹,

Zheng²

2018

Preprint

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“…In wet conditions, the absolute slope value seems to initially increase and then decreases again at higher E‐field intensities. This can be due to the high wind velocity [ Xie and Han , ] and/or to some particular meteorological conditions related to those data (probably microburst events).…”

Section: Resultsmentioning

confidence: 99%

The role of the atmospheric electric field in the dust‐lifting process

Esposito

Molinaro

Popa

et al. 2016

Geophysical Research Letters

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Mineral dust particles represent the most abundant component of atmospheric aerosol in terms of dry mass. They play a key role in climate and climate change, so the study of their emission processes is of utmost importance. Measurements of dust emission into the atmosphere are scarce, so that the dust load is generally estimated using models. It is known that the emission process can generate strong atmospheric electric fields. Starting from the data we acquired in the Sahara desert, here, we show for the first time that depending on the relative humidity conditions, electric fields contribute to increase up to a factor of 10 the amount of particles emitted into the atmosphere. This means that electrical forces and humidity are critical quantities in the dust emission process and should be taken into account in climate and circulation models to obtain more realistic estimations of the dust load in the atmosphere.

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“…Specifically in wind tunnel studies, it was found that electrification is affected by competing processes of aggregation (electrostatic self-assembly), causing reduced charge and aggregate dispersion causing electrification. Xie and Han (2012) performed experiments in a wind tunnel to investigate the effect of relative humidity on aeolian E-field. The working section of the chamber was 20 m × 1.3 m × 1.3 m. A sand bed of 8 m × 12 cm was deposited in the chamber.…”

Section: Wind Tunnel Experimentsmentioning

confidence: 99%

Applications of Electrified Dust and Dust Devil Electrodynamics to Martian Atmospheric Electricity

et al. 2016

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Atmospheric transport and suspension of dust frequently brings electrification, which may be substantial. Electric fields of 10 kV m −1 to 100 kV m −1 have been observed at the surface beneath suspended dust in the terrestrial atmosphere, and some electrification has been observed to persist in dust at levels to 5 km, as well as in volcanic plumes. The interaction between individual particles which causes the electrification is incompletely understood, and multiple processes are thought to be acting. A variation in particle charge with particle size, and the effect of gravitational separation explains to, some extent, the charge structures observed in terrestrial dust storms. More extensive flow-based modelling demonstrates that bulk electric fields in excess of 10 kV m −1 can be obtained rapidly (in less than 10 s) from rotating dust systems (dust devils) and that terrestrial breakdown fields can be obtained. Modelled profiles of electrical conductivity in the Martian atmosphere suggest the possibility of dust electrification, and dust devils have been suggested as a mechanism of charge separation able to maintain current flow between one region of the atmosphere and another, through a global circuit. Fundamental new understanding of Martian atmospheric electricity will result from the ExoMars mission, which carries the DREAMS (Dust characterization, Risk Assessment, and Environment Analyser on the Martian Surface)-B R.G. Harrison

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Influence of relative humidity on the aeolian electric field

Cited by 16 publications

References 27 publications

Quantifying the large-scale electrification equilibrium effects in dust storms using field observations at Qingtu Lake Observatory

Quantifying the large-scale electrification equilibrium effects in dust storms using field observations at Qingtu Lake Observatory

The role of the atmospheric electric field in the dust‐lifting process

Applications of Electrified Dust and Dust Devil Electrodynamics to Martian Atmospheric Electricity

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