Two-dimensional conduction effects in estimating radiative heat flux from a plasma jet

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

It is quite common to employ thin metallic films for the determination of heat transfer rates at a fluid-solid interface. Depending on the duration of the event and gage design, it may be important to account for multi-dimensional heat conduction within the substrate of the thin film. The objective of this work is to assess the effects of two-dimensional heat conduction on the deduced radiative heat fluxes using a conjugate-gradient based inverse algorithm. For comparison, a previously developed one-dimensional inverse technique is also used. The high heat fluxes are produced by an electrothermal-chemical plasma jet. The plasma, initiated within a 3.2 mm diameter and 26 mm long polyethylene capillary by exploding a 3.6 mg thin copper wire, emerges into an open-air atmosphere as a high-temperature, high-pressure, underexpanded supersonic jet. The jet impinges over a stagnation plate equipped with thin-film sputtered platinum heat-flux gages, whose temperature history serves as an input to the heat-flux estimation algorithm. Four different charging voltage levels are investigated, ranging from 2.5 to 7.5kV. While both algorithms capture the temporal variations of the radiative heat fluxes, two-dimensional heat conduction model reveals the discrepancies between the two techniques as well as the range of applicability of the one-dimensional model.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference Proceedings
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
Pages1101-1113
Number of pages13
ISBN (Print)1563478153, 9781563478154
DOIs
StatePublished - 2006
Event9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference Proceedings - San Francisco, CA, United States
Duration: Jun 5 2006Jun 8 2006

Publication series

NameCollection of Technical Papers - 9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference Proceedings
Volume2

Other

Other9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference Proceedings
CountryUnited States
CitySan Francisco, CA
Period6/5/066/8/06

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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