On the radiative heat loss and axis-switching phenomena of a decaying laser spark

Joarder, R and Vellala, SL and Singh, AP and Syam, S and Padhi, UP and Choudhury, SP (2021) On the radiative heat loss and axis-switching phenomena of a decaying laser spark. In: Plasma Sources Science and Technology, 30 (1).

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Abstract

A three-dimensional numerical simulation of a decaying laser spark in gaseous nitrogen has been carried out in Cartesian co-ordinate. The simulation starts with the introduction of a laser pulse in the domain. Thermal equilibrium has been assumed throughout the numerical simulation involving the species N2, N, N+, e�. The boundary conditions are treated following characteristic property of the waves to ensure smooth transmission of the blast wave out of the computational domain. The previously unexplained axis-switching phenomenon of the breakdown region has been explained, and a qualitative comparison of the same with experimental schlieren images has been made. The total radiation loss, including the loss during the breakdown, has been calculated. The variation of inverse Bremsstrahlung radiation, black body radiation, and spectral radiation of atomic nitrogen with time have been shown separately. Additionally, the temporal variation of radiation intensity of atomic nitrogen over a wavelength range has been plotted. The total radiation loss has been found to be small compared to the deposited laser energy. © 2021 IOP Publishing Ltd Printed in the UK.

Item Type:	Journal Article
Publication:	Plasma Sources Science and Technology
Publisher:	IOP Publishing Ltd
Additional Information:	The copyright for this article belongs to IOP Publishing Ltd
Keywords:	Nitrogen; Numerical models; Wave transmission, Black body radiation; Cartesian coordinate; Characteristic properties; Computational domains; Inverse bremsstrahlungs; Radiation intensity; Thermal equilibriums; Three-dimensional numerical simulations, Radiation
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	30 Dec 2021 04:57
Last Modified:	30 Dec 2021 04:57
URI:	http://eprints.iisc.ac.in/id/eprint/67943

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