Documents disponibles écrits par cet auteur

New HIGEE-rotating zigzag bed and its mass transfer performance / Q.G. Wang ; O. G. Xu ; Z. C. Xu ; J. B. Ji in Industrial & engineering chemistry research, Vol. 47 n°22 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8840–8846 Titre : New HIGEE-rotating zigzag bed and its mass transfer performance Type de document : texte imprimé Auteurs : Q.G. Wang, Auteur ; O. G. Xu, Auteur ; Z. C. Xu, Auteur ; J. B. Ji, Auteur Année de publication : 2008 Article en page(s) : p. 8840–8846 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : HIGEE-Rotating  Zigzag  Bed Résumé : To overcome the disadvantages of the rotating bed available in open literature, a novel kind of high gravity device-rotating zigzag bed (RZB) was developed, which exhibits many superior features owing to its unique rotor combining a rotational part with a stationary one. The outstanding characteristics of RZB are its capability of middle-feed and easily realizing multirotor configuration in one unit by simply installing multiple rotors along the same axis. Thus one unit of RZB can be applied to continuous distillation processes with a higher mass transfer capacity. A preliminary test of mass transfer performance of the RZB in a pilot-scale system using methanol−water was carried out in this study. Experimental results show its excellent mass transfer behavior with an acceptable pressure drop. Comparison with rotating packing bed (RPB) shows that RZB provides equivalent mass transfer efficiency to RPB but exhibits excellent operability with a higher turndown ratio than that of RPB. Comparison with valve tray indicates that the baffle efficiency of RZB is slightly lower than the plate efficiency of valve tray. But if the difference between the tray space and baffle space is taken into consideration, RZB provides much higher efficiency than that of valve tray. Therefore the RZB is a kind of high efficiency gas−liquid contactor and a promising alternative in chemical process industries. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801020u [article] New HIGEE-rotating zigzag bed and its mass transfer performance [texte imprimé] / Q.G. Wang, Auteur ; O. G. Xu, Auteur ; Z. C. Xu, Auteur ; J. B. Ji, Auteur . - 2008 . - p. 8840–8846. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8840–8846 Mots-clés : HIGEE-Rotating  Zigzag  Bed Résumé : To overcome the disadvantages of the rotating bed available in open literature, a novel kind of high gravity device-rotating zigzag bed (RZB) was developed, which exhibits many superior features owing to its unique rotor combining a rotational part with a stationary one. The outstanding characteristics of RZB are its capability of middle-feed and easily realizing multirotor configuration in one unit by simply installing multiple rotors along the same axis. Thus one unit of RZB can be applied to continuous distillation processes with a higher mass transfer capacity. A preliminary test of mass transfer performance of the RZB in a pilot-scale system using methanol−water was carried out in this study. Experimental results show its excellent mass transfer behavior with an acceptable pressure drop. Comparison with rotating packing bed (RPB) shows that RZB provides equivalent mass transfer efficiency to RPB but exhibits excellent operability with a higher turndown ratio than that of RPB. Comparison with valve tray indicates that the baffle efficiency of RZB is slightly lower than the plate efficiency of valve tray. But if the difference between the tray space and baffle space is taken into consideration, RZB provides much higher efficiency than that of valve tray. Therefore the RZB is a kind of high efficiency gas−liquid contactor and a promising alternative in chemical process industries. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801020u

Size effects in aluminium alloy castings / Q.G. Wang in Acta materialia, Vol. 58 N° 8 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 3006–3013 Titre : Size effects in aluminium alloy castings Type de document : texte imprimé Auteurs : Q.G. Wang, Auteur ; M. Praud, Auteur ; A. Needleman, Auteur Année de publication : 2011 Article en page(s) : pp. 3006–3013 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Al  castings  Hall–Petch  Dendrite  arm  spacing  Discrete  dislocations Résumé : A finding by Benzerga et al. (Acta Mater 2001; 49:3071) that the yield strength of Al–7Si–0.3Mg castings is smaller for castings with a fine secondary dendrite arm spacing (SDAS) than for those with a coarse SDAS is revisited. Previous experimental data for Al–Si–Mg castings are reviewed, and new experiments carried out, both on the original castings used in Benzerga et al. and on Al–Si binary alloy castings whose microstructures more closely conform to the theoretical model of Benzerga et al. The experimental results show that the inverse size effect reported by Benzerga et al. was a consequence of different heat-treatments applied to the original castings, rather than to any intrinsic size effect. The present results confirm that there is a negligibly small size effect in both heat-treatable (Al–Si–Mg) and non-heat-treatable (Al–Si) castings. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000467 [article] Size effects in aluminium alloy castings [texte imprimé] / Q.G. Wang, Auteur ; M. Praud, Auteur ; A. Needleman, Auteur . - 2011 . - pp. 3006–3013. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 3006–3013 Mots-clés : Al  castings  Hall–Petch  Dendrite  arm  spacing  Discrete  dislocations Résumé : A finding by Benzerga et al. (Acta Mater 2001; 49:3071) that the yield strength of Al–7Si–0.3Mg castings is smaller for castings with a fine secondary dendrite arm spacing (SDAS) than for those with a coarse SDAS is revisited. Previous experimental data for Al–Si–Mg castings are reviewed, and new experiments carried out, both on the original castings used in Benzerga et al. and on Al–Si binary alloy castings whose microstructures more closely conform to the theoretical model of Benzerga et al. The experimental results show that the inverse size effect reported by Benzerga et al. was a consequence of different heat-treatments applied to the original castings, rather than to any intrinsic size effect. The present results confirm that there is a negligibly small size effect in both heat-treatable (Al–Si–Mg) and non-heat-treatable (Al–Si) castings. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000467