A simple electrodynamic model of a dust devil

Farrell, W. M.; Delory, G. T.; Cummer, Steven A.; Marshall, John R.

doi:10.1029/2003gl017606

Cited by 52 publications

(78 citation statements)

References 17 publications

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“…Previous models use simplifying assumptions to explain individual grain charging, such as assuming a constant charge rate [Farrell et al, 2003], or assuming grains in isolation [Melnik and Parrot, 1998]. In this work, we examine the more advanced case where grain charge relaxes in an atmosphere, creating local grain charge dissipation.…”

Section: Quasi-electrostatic Model Formulationmentioning

confidence: 99%

“…The formation and evolution of dust storms is a multiphysical process involving dust particle thermal and kinetic energy evolution, dust grain contact electrification and charge separation [Toigo et al, 2003;Farrell et al, 2003]. Initially, surface air molecules and dust grains absorbing heat from sunlight generate pressure and temperature gradients on the surfaces that form vertical wind or local vortices, and dust grains are lifted from the ground.…”

Section: Introductionmentioning

confidence: 99%

“…More recent studies show that the charge of dust grains after collision depend on humidity, temperature, and its velocity [Poppe and Schrapler, 2005]. On the basis of the two tribocharging scenarios and the vertical charge transport similar to the thunderstorm precipitation electrification mechanism [Mathpal et al, 1980], Farrell et al [2003] developed a fully analytical electrodynamic model of a dust devil with simplified assumptions of dust devil structures, time rate of charging, etc. The large vertical electric fields quickly exceed breakdown values, consistent with simulations by Melnik and Parrot [1998].…”

Section: Introductionmentioning

confidence: 99%

“…Recent numerical and analytical studies show that the micro-electro-aerodynamical system of a dust devil is an efficient giant electric generator that may trigger Martian electrical discharges and radio emissions Parrot, 1998, 1999;Farrell et al, , 2003. Experimental evidence in a Martian-like lab environment has shown the possibility of electric discharges of Martian dust storms [Eden and Vonnegut, 1973], and theoretical and modeling studies have indicated that under some conditions, discharging may occur [Melnik and Parrot, 1998;Farrell et al, 2003]. However, many critical issues, such as under what conditions can the field reach breakdown values and whether charge and electric field growth will be saturated before reaching the breakdown, have not been systematically addressed.…”

Section: Introductionmentioning

confidence: 99%

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Quasi‐electrostatic field analysis and simulation of Martian and terrestrial dust devils

2006

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[1] Recent experimental and modeling studies show that large quasi-static electric fields (2-20 kV/m) can be developed in a Martian or terrestrial dust devil as a result of contact electrification and charge separation of dust grains with different sizes and compositions. Electric discharging occurs when the maximum electric field reaches breakdown values ($20 kV/m on Mars and $3 MV/m on Earth, at surface altitudes). We derive a maximum electric field in a dust devil and develop a two-dimensional (2-D) cylindrically symmetric finite element model for Martian and terrestrial dust devil simulations. Unlike previous models with unlimited field growth, the tribocharging process and the time evolution of the dust devil electric field are self-consistently limited in our model and the saturated maximum electric fields in our simulations are comparable to past measurements. We study the saturated maximum electric fields for dust storms of different size, atmosphere conductivity and time rate of tribocharging. We also discuss the 2-D cylindrical field structures surrounding a dust devil and the conductivity gradient effect to the field growth of large Martian dust storms.

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Section: Quasi-electrostatic Model Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quasi‐electrostatic field analysis and simulation of Martian and terrestrial dust devils

2006

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“…The size-dependence of particle triboelectrification is observed in both natural phenomena [10,65] and industrial processes [11,66], which gives it priority in research fields and for which many modeling studies have been conducted [9,67,68].…”

Section: Particle Sizementioning

confidence: 99%

Fundamental theories and basic principles of triboelectric effect: A review

2018

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Long-term observation of the triboelectric effect has not only proved the feasibility of many novel and useful tribo-devices (e.g., triboelectric nanogenerators), but also constantly motivated the exploration of its mysterious nature. In the pursuit of a comprehensive understanding of how the triboelectric process works, a more accurate description of the triboelectric effect and its related parameters and factors is urgently required. This review critically goes through the fundamental theories and basic principles governing the triboelectric process. By investigating the difference between each charging media, the electron, ion, and material transfer is discussed and the theoretical deduction in the past decades is provided. With the information from the triboelectric series, interesting phenomena including cyclic triboelectric sequence and asymmetric triboelectrification are precisely analyzed. Then, the interaction between the tribo-system and its operational environment is analyzed, and a fundamental description of its effects on the triboelectric process and results is summarized. In brief, this review is expected to provide a strong understanding of the triboelectric effect in a more rigorous mathematical and physical sense.

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The role of turbulence in thunderstorm, snowstorm, and dust storm electrification

Mareev

Dementyeva

2017

JGR Atmospheres

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In this paper the contribution of turbulence into the electrification of thunderstorms, snowstorms, and dust storms is investigated for the first time. A model of large‐scale electric field generation in a weakly conducting medium, containing two types of particles charging by collisions, is used. Thunderstorm and snowstorm electrification are considered in detail in this paper; dust storm electrification is also considered, despite being substantially different from the two other cases, to demonstrate the universality of the proposed method. A comparison of the results with the experimental data for thunderstorms, blizzards, and dust storms is carried out. It is found that the situation is notably different for inductive and noninductive charge separations. For inductive charge separation there is a range of thunderstorm and snowstorm parameters (conductivity and the particle radii being the most important factors) for which the electric field grows exponentially with time. This effect can make the inductive mechanism dominant near the breakdown field in turbulent zones of thunderclouds. For noninductive (or triboelectric) charge separation caused by intense velocity fluctuations, the electric field strength grows only linearly with time. The most substantial effect of turbulence on noninductive charging is expected to occur in snowstorms and dust storms, whereas noninductive turbulent charging has a little impact on the thunderstorm electrification.

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A simple electrodynamic model of a dust devil

Cited by 52 publications

References 17 publications

Quasi‐electrostatic field analysis and simulation of Martian and terrestrial dust devils

Quasi‐electrostatic field analysis and simulation of Martian and terrestrial dust devils

Fundamental theories and basic principles of triboelectric effect: A review

The role of turbulence in thunderstorm, snowstorm, and dust storm electrification

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