Documents disponibles écrits par cet auteur

Simultaneous measurement of three-dimensional soot temperature and volume fraction fields in axisymmetric or asymmetric small unconfined flames with CCD cameras / D. Liu in Journal of heat transfer, Vol. 132 N° 6 (Juin 2010) 

Public ISBD [article]  in Journal of heat transfer > Vol. 132 N° 6 (Juin 2010) . - pp. [061202-1/7] Titre : Simultaneous measurement of three-dimensional soot temperature and volume fraction fields in axisymmetric or asymmetric small unconfined flames with CCD cameras Type de document : texte imprimé Auteurs : D. Liu, Auteur ; Q. X. Huang, Auteur ; F. Wang, Auteur Article en page(s) : pp. [061202-1/7] Note générale : Physique Langues : Anglais (eng) Mots-clés : Soot  temperature  Soot  volume  fraction  Axisymmetric  flame  Asymmetric  flame  CCD  camera Index. décimale : 536 Chaleur. Thermodynamique Résumé : A nonintrusive measurement technique is presented numerically for simultaneous measurement of three-dimensional (3D) soot temperature and volume fraction fields in the axisymmetric or asymmetric flames with charge-coupled device (CCD) cameras. CCD cameras were introduced to capture the flame images for obtaining the line-of-sight radiation intensities. The distributions of local emission source under two wavelengths can be deduced through solving the reconstruction matrix equation by the least-square QR decomposition method from the knowledge of the line-of-sight radiation intensities of the flames. The two-color distributions of the local emission source were used to retrieve the soot temperature and volume fraction distributions. The effects of the discrete ray number of CCD cameras, the number of CCD cameras, and the system signal-to-noise ratio (SNR) on the measurement were investigated. The results show that for accurate measurement of soot volume fraction field, the CCD cameras number should not be less than four and the system SNR can be as low as 54 dB. The proposed technique can be capable for reconstructing the 3D soot temperature and volume fraction fields in both axisymmetric and asymmetric flames well. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Simultaneous measurement of three-dimensional soot temperature and volume fraction fields in axisymmetric or asymmetric small unconfined flames with CCD cameras [texte imprimé] / D. Liu, Auteur ; Q. X. Huang, Auteur ; F. Wang, Auteur . - pp. [061202-1/7]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 6 (Juin 2010) . - pp. [061202-1/7] Mots-clés : Soot  temperature  Soot  volume  fraction  Axisymmetric  flame  Asymmetric  flame  CCD  camera Index. décimale : 536 Chaleur. Thermodynamique Résumé : A nonintrusive measurement technique is presented numerically for simultaneous measurement of three-dimensional (3D) soot temperature and volume fraction fields in the axisymmetric or asymmetric flames with charge-coupled device (CCD) cameras. CCD cameras were introduced to capture the flame images for obtaining the line-of-sight radiation intensities. The distributions of local emission source under two wavelengths can be deduced through solving the reconstruction matrix equation by the least-square QR decomposition method from the knowledge of the line-of-sight radiation intensities of the flames. The two-color distributions of the local emission source were used to retrieve the soot temperature and volume fraction distributions. The effects of the discrete ray number of CCD cameras, the number of CCD cameras, and the system signal-to-noise ratio (SNR) on the measurement were investigated. The results show that for accurate measurement of soot volume fraction field, the CCD cameras number should not be less than four and the system SNR can be as low as 54 dB. The proposed technique can be capable for reconstructing the 3D soot temperature and volume fraction fields in both axisymmetric and asymmetric flames well. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]

Study on corrosive electrochemical behaviors of zinc-rich and graphite-filled epoxy coatings in 3.5 wt% NaCl solution / J. Liu in Materials and corrosion, Vol. 62 N° 11 (Novembre 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp.1008–1014 Titre : Study on corrosive electrochemical behaviors of zinc-rich and graphite-filled epoxy coatings in 3.5 wt% NaCl solution Type de document : texte imprimé Auteurs : J. Liu, Auteur ; F. Wang, Auteur ; K. C. Park, Auteur Année de publication : 2012 Article en page(s) : pp.1008–1014 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosive  behaviors  EIS  Epoxy  coatings  Mechanisms  Seawater Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Environment behaviors and degradation mechanisms of two organic epoxy coatings coated on carbon steel sheets in 3.5 wt% NaCl neutral solution were studied by electrochemical impedance measurements and atomic force microscopy (AFM). The results showed that the coating resistance (Rp) of the graphite-filled epoxy coating tested, which presents the film barrier performance, is higher than those of 6101 epoxy resin for initial seawater immersion, but the coating resistance of the zinc-rich epoxy coating was lower than that of 6101 epoxy resin. After salt spray tests, zinc-rich epoxy coating coated on the metal still has good anti-corrosion performances due to the existence of protection effects called “electrochemical” and “chemical” protection. Those behaviors and degradation mechanisms of two coatings can be explained by a series of measured electrochemical impedance spectroscopy measurements, and two equivalent circuit models were proposed to explain the degradation processes of the two organic coatings. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905517/abstract [article] Study on corrosive electrochemical behaviors of zinc-rich and graphite-filled epoxy coatings in 3.5 wt% NaCl solution [texte imprimé] / J. Liu, Auteur ; F. Wang, Auteur ; K. C. Park, Auteur . - 2012 . - pp.1008–1014. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp.1008–1014 Mots-clés : Corrosive  behaviors  EIS  Epoxy  coatings  Mechanisms  Seawater Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Environment behaviors and degradation mechanisms of two organic epoxy coatings coated on carbon steel sheets in 3.5 wt% NaCl neutral solution were studied by electrochemical impedance measurements and atomic force microscopy (AFM). The results showed that the coating resistance (Rp) of the graphite-filled epoxy coating tested, which presents the film barrier performance, is higher than those of 6101 epoxy resin for initial seawater immersion, but the coating resistance of the zinc-rich epoxy coating was lower than that of 6101 epoxy resin. After salt spray tests, zinc-rich epoxy coating coated on the metal still has good anti-corrosion performances due to the existence of protection effects called “electrochemical” and “chemical” protection. Those behaviors and degradation mechanisms of two coatings can be explained by a series of measured electrochemical impedance spectroscopy measurements, and two equivalent circuit models were proposed to explain the degradation processes of the two organic coatings. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905517/abstract