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Time resolved quantitative imaging of charring in materials at temperatures above 1000 K

Böhrk, Hannah and Jemmali, Raouf (2016) Time resolved quantitative imaging of charring in materials at temperatures above 1000 K. Review of Scientific Instruments, 87 (073701), 073701-1. American Institute of Physics (AIP). DOI: 10.1063/1.4955441 ISBN ISSN: 0034-6748 ISSN 0034-6748

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Official URL: http://scitation.aip.org/content/aip/journal/rsi/87/7/10.1063/1.4955441


A device is presented allowing for in situ investigation of chemically changing materials by means of X-ray imaging. A representative cork ablator sample, additionally instrumented with thermocouples, is encapsulated in an evacuated cell heating a sample surface with a heat flux of 230 kW/m2. The images show the sample surface and the in-depth progression of the char front dividing the char layer from the virgin material. Correlating the images to thermocouple data allows for the deduction of a reaction temperature. For the representative cork ablator investigated at the present conditions, the progression rate of the pyrolysis layer is determined to 0.0285 mm/s and pyrolysis temperature is 770 or 737 K, depending on the pre-existing conditions. It is found that the novel device is ideally suited for volume process imaging.

Item URL in elib:https://elib.dlr.de/108880/
Document Type:Article
Title:Time resolved quantitative imaging of charring in materials at temperatures above 1000 K
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Böhrk, HannahHannah.Boehrk (at) dlr.deUNSPECIFIED
Jemmali, RaoufRaouf.Jemmali (at) dlr.deUNSPECIFIED
Date:14 July 2016
Journal or Publication Title:Review of Scientific Instruments
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1063/1.4955441
Page Range:073701-1
Publisher:American Institute of Physics (AIP)
ISBN:ISSN: 0034-6748
Keywords:in-situ Imaging charring Ablation high-temperature
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Fligthexperiment Newfex, R - Shefex III
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Space System Integration
Deposited By: Böhrk, Hannah
Deposited On:19 Dec 2016 11:03
Last Modified:06 Sep 2019 15:29

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