The Electrical Conductivity as an Index of Air Pollution in the Atmosphere

Nagaraja, K.K.; Prasad, B. S. N.; Datta, Jayati

doi:10.5772/17163

Cited by 6 publications

(7 citation statements)

References 27 publications

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“…In order to progress this topic a broader review of the literature has been undertaken and this has identified a number of significant works. Kamsali et al [31] conducted air electric conductivity measurements in atmosphere at room temperature and reported it to be approximately 1E-14 S/m. Additionally, electron cold field emissions based on Fowler and Nordheim's work [32] has the potential to model the critical behaviour, which is discussed also in Forbes et al [33].…”

Section: Methodsmentioning

confidence: 99%

“…The anode in this simulation is the aircraft structure. Air plasma's transport properties are taken from references [31,40]. Capitelli et al [40] calculated air transport properties in the temperature range 50-100,000 K applying the perturbative Chapman-Enskog method, while assuming the air plasma is in local thermodynamic equilibrium (LTE).…”

Section: Waveform-b Simulationmentioning

confidence: 99%

“…A fully coupled time-dependent analysis is simulated for a total of 4E-5 seconds. The air plasma electric conductivity is initially that of air at a temperature of 300 K (1e-14 S/m) (Kamsali et al [31].). Then, the electric conductivity is calculated using equation (19) and averaged along line 2-3.…”

Section: Initial Electric Conductivity Modelmentioning

confidence: 99%

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A Multiphysics Simulation Approach for Efficient Modeling of Lightning Strike Tests on Aircraft Structures

Abdelal

Murphy

2017

IEEE Trans. Plasma Sci.

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A numerical approach is proposed and demonstrated for efficient modelling of the thermal plasma behaviour present during a lightning strike event. The approach focuses on events with time-scales from microseconds to milliseconds and combines the finite element method, Magnetohydrodynamics and Similitude theory. Similitude theory is used to scale the problem to require considerably less computing resource. To further reduce the computational burden and to resolve the numerical difficulty of simulating the nearly zero electrical conductivity of air at room temperature an approach based on cold field electron emissions is introduced. Simulations considering turbulent flow have been considered, modelling a test configuration from literature designed to inspect composite material performance and applying an aerospace standard test profile (waveform-B). Predicted peak temperatures (of the order of ~40,000 K) and pressures (of the order of 0.1-0.2 MPa) suggest that the pressure loading during a waveform-B event will have a minimal effect on composite material damage.

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Section: Methodsmentioning

confidence: 99%

Section: Waveform-b Simulationmentioning

confidence: 99%

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A Multiphysics Simulation Approach for Efficient Modeling of Lightning Strike Tests on Aircraft Structures

Abdelal

Murphy

2017

IEEE Trans. Plasma Sci.

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“…Eq. (5) is a specialised and novel steady-state version of a primal time-dependent governing equation, the latter routinely found elsewhere [6], [7], for the charge concentration. What is something new in that formula is the quantity in parenthesis, under the square root.…”

Section: Radon Decay Related Image Mechanism Preliminary Remarksmentioning

confidence: 99%

“…This zone, previously categorised as a radon-prone one [5], is part of the Jordan Rift Valley where radon sources are underground veins, or outcrops, mainly made of phosphorite. The radon exhalation and accumulation in air filled and closed spaces can only be preceded by below ground emanation along unpredictable routes up to the surface [6]. A rift appears typically fractured somewhere as a result of long-termed geologic history.…”

Section: Introductionmentioning

confidence: 99%

Electrostatic imaging for the Turin-Shroud Man

Lattarulo

2015

MATEC Web of Conferences

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Abstract. This paper is especially aimed at claiming the electrical imaging as the most eligible transfer mechanism, than among others, in relation to the undistorted (to some extent, to be quite specific) body features of the Turin Shroud Man. Explaining the good quality of an on-plane electrostatic rendering turns out to be a rather hard exercise because of the refined composition of arguments that the subject carries along behind it. These need careful attention, as that paid to the greatest possible extent in the present treatment, in order to set up an indispensable theoretical background preparatory to any future experimental validation. We are very hopeful that this outcome can be reached with the stipulation that the exposed body is embedded in a suitably pre-ionized airspace. Accordingly, a suitable radon-originated air ionization scenario, internally to a closed space, is envisaged and discussed in the present stage of the investigation. The radon concentration needed to trigger and control interspersed corona activity is carefully examined. This activity results in a typical accelerated-aging surface agent for fabric and other dielectric materials. The given physicochemical degradation is here assumed as being directly implied, under prescribed conditions, even in the special image formation pertaining to the Shroud of Turin. Perhaps, the most striking prediction made in the paper is that, under tectonic conditions which are usually met in a number of radon-prone areas, radon overconcentrations can attain and exceed the level related to the discharge onset. Interestingly, this is also the case for the Old City of Jerusalem as a place intimately connected to Turin Shroud studies.

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