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Experimental study of mass transfer in membrane absorption process using membranes with different porosities / Zhang, Weidong in Industrial & engineering chemistry research, Vol. 49 N° 14 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6641–6648 Titre : Experimental study of mass transfer in membrane absorption process using membranes with different porosities Type de document : texte imprimé Auteurs : Zhang, Weidong, Auteur ; Li Jiang, Auteur ; Geng Chen, Auteur Année de publication : 2010 Article en page(s) : pp. 6641–6648 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Mass  transfer  Membrane  absorption Résumé : Experimental study has been carried out to investigate the mass transfer behavior when carbon dioxide (CO2) is absorbed through microporous membranes with different porosities. Deionized water and sodium hydroxide (NaOH) aqueous solutions are chosen as absorbents. The effects of membrane porosity, absorbent pH value, and liquid velocity on mass transfer are studied. The effect of membrane porosity on mass transfer depends on both the absorbent pH value and liquid velocity. In the case of low pH values (7−11) in absorbent, membrane porosity almost has no effect on mass transfer at relatively lower liquid velocity, namely, the mass transfer coefficients based on the whole membrane area remain almost the same at different membrane porosities; the effect of membrane porosity on mass transfer becomes obvious with the increasing liquid velocity. Contrarily, as the absorbent pH value increases to 12 or 13, the influence of porosity on mass transfer coefficient becomes significant at varied liquid velocity. The modified mass transfer correlations are obtained with consideration of the effect of porosity over a varying membrane porosity range. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1001026 [article] Experimental study of mass transfer in membrane absorption process using membranes with different porosities [texte imprimé] / Zhang, Weidong, Auteur ; Li Jiang, Auteur ; Geng Chen, Auteur . - 2010 . - pp. 6641–6648. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6641–6648 Mots-clés : Mass  transfer  Membrane  absorption Résumé : Experimental study has been carried out to investigate the mass transfer behavior when carbon dioxide (CO2) is absorbed through microporous membranes with different porosities. Deionized water and sodium hydroxide (NaOH) aqueous solutions are chosen as absorbents. The effects of membrane porosity, absorbent pH value, and liquid velocity on mass transfer are studied. The effect of membrane porosity on mass transfer depends on both the absorbent pH value and liquid velocity. In the case of low pH values (7−11) in absorbent, membrane porosity almost has no effect on mass transfer at relatively lower liquid velocity, namely, the mass transfer coefficients based on the whole membrane area remain almost the same at different membrane porosities; the effect of membrane porosity on mass transfer becomes obvious with the increasing liquid velocity. Contrarily, as the absorbent pH value increases to 12 or 13, the influence of porosity on mass transfer coefficient becomes significant at varied liquid velocity. The modified mass transfer correlations are obtained with consideration of the effect of porosity over a varying membrane porosity range. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1001026

Thermal effect at the incipient stage of cavitation erosion on a stainless steel in ultrasonic vibration cavitation / Haosheng, Chen in Transactions of the ASME . Journal of fluids engineering, Vol. 131 N° 2 (Fevrier 2009) 

Public ISBD [article]  in Transactions of the ASME . Journal of fluids engineering > Vol. 131 N° 2 (Fevrier 2009) . - 03 p. Titre : Thermal effect at the incipient stage of cavitation erosion on a stainless steel in ultrasonic vibration cavitation Type de document : texte imprimé Auteurs : Haosheng, Chen, Auteur ; Li Jiang, Auteur ; Liu Shihan, Auteur Année de publication : 2009 Article en page(s) : 03 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : heat;  temperature;  surface  roughness;  cavitation;  bubbles;  temperature  effects;  cavitation  erosion;  erosion;  vibration;  stainless  steel;  water;  high  temperature Résumé : An ultrasonic vibration cavitation erosion experiment was performed to study the thermal effect during the erosion process. The ring affected zone was observed on the sample surface around the erosion pit at the incipient stage of the cavitation erosion. The results of the surface testing on roughness, hardness, and chemical composition proved that the zone was caused by thermal effect, and that the zone surface experienced a tempering process with the temperature higher than 300°C. Numerical simulation results show that the high temperature domain in the bubble directly contacting the solid wall is a necessary condition for the occurrence of the tempering process on the zone surface, or the heat in the bubble can hardly be transferred to the solid wall under the effects of the great temperature gradient in the bubble and the quick cooling process in the water. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] Thermal effect at the incipient stage of cavitation erosion on a stainless steel in ultrasonic vibration cavitation [texte imprimé] / Haosheng, Chen, Auteur ; Li Jiang, Auteur ; Liu Shihan, Auteur . - 2009 . - 03 p. fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 131 N° 2 (Fevrier 2009) . - 03 p. Mots-clés : heat;  temperature;  surface  roughness;  cavitation;  bubbles;  temperature  effects;  cavitation  erosion;  erosion;  vibration;  stainless  steel;  water;  high  temperature Résumé : An ultrasonic vibration cavitation erosion experiment was performed to study the thermal effect during the erosion process. The ring affected zone was observed on the sample surface around the erosion pit at the incipient stage of the cavitation erosion. The results of the surface testing on roughness, hardness, and chemical composition proved that the zone was caused by thermal effect, and that the zone surface experienced a tempering process with the temperature higher than 300°C. Numerical simulation results show that the high temperature domain in the bubble directly contacting the solid wall is a necessary condition for the occurrence of the tempering process on the zone surface, or the heat in the bubble can hardly be transferred to the solid wall under the effects of the great temperature gradient in the bubble and the quick cooling process in the water. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]