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Improved absorption in gas−liquid systems by the addition of a low surface tension component in the gas and/or liquid phase / Nai-Hsuan Yang ; Yi-Jen Chen ; Chien-Chih Liao ; Tsair-Wang Chung 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. 8823–8827 Titre : Improved absorption in gas−liquid systems by the addition of a low surface tension component in the gas and/or liquid phase Type de document : texte imprimé Auteurs : Nai-Hsuan Yang, Auteur ; Yi-Jen Chen, Auteur ; Chien-Chih Liao, Auteur ; Tsair-Wang Chung, Auteur Année de publication : 2008 Article en page(s) : p. 8823–8827 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Gas−Liquid Résumé : If a system uses the phenomenon of Marangoni convection, there will be more interfacial turbulence and this may dominate the mass transfer performance between the gas and liquid phases. Marangoni convection was applied in a gas−liquid contact device (dehumidifier) in this study to measure the effect of interfacial turbulence on the water vapor removal efficiency caused by adding a low surface tension component (99.5% ethanol) into the gas or liquid phase at room temperature. The differences in water vapor removal efficiency under different conditions with and without the addition of ethanol into the moist air or working solution (38−42 wt % aqueous lithium chloride solution) were observed. Since the Marangoni effect was more pronounced when the concentration of working solution was greater than a specific value, the trend line for water vapor removal efficiency in different solution concentrations was presented as a broken line in this study. The break in the trend line is the critical concentration of the working solution, and the value is about 40 wt % of aqueous lithium chloride solution. The experimental results show that addition of low surface tension ethanol into the gas phase was better than adding it into the liquid phase for the interfacial mass transfer performance in this gas−liquid contact device. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800316n [article] Improved absorption in gas−liquid systems by the addition of a low surface tension component in the gas and/or liquid phase [texte imprimé] / Nai-Hsuan Yang, Auteur ; Yi-Jen Chen, Auteur ; Chien-Chih Liao, Auteur ; Tsair-Wang Chung, Auteur . - 2008 . - p. 8823–8827. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8823–8827 Mots-clés : Gas−Liquid Résumé : If a system uses the phenomenon of Marangoni convection, there will be more interfacial turbulence and this may dominate the mass transfer performance between the gas and liquid phases. Marangoni convection was applied in a gas−liquid contact device (dehumidifier) in this study to measure the effect of interfacial turbulence on the water vapor removal efficiency caused by adding a low surface tension component (99.5% ethanol) into the gas or liquid phase at room temperature. The differences in water vapor removal efficiency under different conditions with and without the addition of ethanol into the moist air or working solution (38−42 wt % aqueous lithium chloride solution) were observed. Since the Marangoni effect was more pronounced when the concentration of working solution was greater than a specific value, the trend line for water vapor removal efficiency in different solution concentrations was presented as a broken line in this study. The break in the trend line is the critical concentration of the working solution, and the value is about 40 wt % of aqueous lithium chloride solution. The experimental results show that addition of low surface tension ethanol into the gas phase was better than adding it into the liquid phase for the interfacial mass transfer performance in this gas−liquid contact device. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800316n

Influences for the addition of ethanol to the absorption system on the interfacial disturbances and mass transfer performance / Honda Wu in Industrial & engineering chemistry research, Vol. 47 N°19 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7397–7404 Titre : Influences for the addition of ethanol to the absorption system on the interfacial disturbances and mass transfer performance Type de document : texte imprimé Auteurs : Honda Wu, Auteur ; Tsair-Wang Chung, Auteur Année de publication : 2008 Article en page(s) : p. 7397–7404 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Triethylene  glycol  Diethylene  glycol  Interfacial  mass  transfer  phenomena  Absorption  system Résumé : To study the interfacial mass transfer phenomena of water vapor absorbed by TEG (triethylene glycol) and DEG (diethylene glycol) solutions, an absorption system was designed and tested in this study. The surface tensions of TEG and DEG solutions were varied by adding a liquid with lower surface tension to observe the interfacial disturbances and the mass transfer performance of the absorption system. In this study, ethanol was added to the absorbent solution. The traditional variable of driving force was replaced by the variable of surface tension times driving force to compare the variation of mass transfer coefficients of systems with and without ethanol added to the absorbent solution. The results showed that surface tension significantly affected the mass transfer performance in the gas−liquid interface. Both mass transfer coefficient and enhancement factors were calculated to analyze the effects of interfacial disturbance on mass transfer performance. The photographs showed that when ethanol was added to the surface of the TEG solution, the interfacial disturbance on the surface of the TEG solution was significant. The experimental results also demonstrated that the mass transfer coefficients were increased due to the addition of ethanol to the absorbent solution. The values of the defined enhancement factor were from 1.047 to 1.143 for the system with DEG solution and from 1.064 to 1.161 for the system with TEG solution. Both driving force and surface tension were important physical properties that affected the mass transfer phenomena of the absorption system. The interfacial disturbance resulting from the addition of ethanol to the absorbent solution can be used to enhance the mass transfer performance for absorption heat pump and absorption air-conditioning systems. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071534c [article] Influences for the addition of ethanol to the absorption system on the interfacial disturbances and mass transfer performance [texte imprimé] / Honda Wu, Auteur ; Tsair-Wang Chung, Auteur . - 2008 . - p. 7397–7404. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7397–7404 Mots-clés : Triethylene  glycol  Diethylene  glycol  Interfacial  mass  transfer  phenomena  Absorption  system Résumé : To study the interfacial mass transfer phenomena of water vapor absorbed by TEG (triethylene glycol) and DEG (diethylene glycol) solutions, an absorption system was designed and tested in this study. The surface tensions of TEG and DEG solutions were varied by adding a liquid with lower surface tension to observe the interfacial disturbances and the mass transfer performance of the absorption system. In this study, ethanol was added to the absorbent solution. The traditional variable of driving force was replaced by the variable of surface tension times driving force to compare the variation of mass transfer coefficients of systems with and without ethanol added to the absorbent solution. The results showed that surface tension significantly affected the mass transfer performance in the gas−liquid interface. Both mass transfer coefficient and enhancement factors were calculated to analyze the effects of interfacial disturbance on mass transfer performance. The photographs showed that when ethanol was added to the surface of the TEG solution, the interfacial disturbance on the surface of the TEG solution was significant. The experimental results also demonstrated that the mass transfer coefficients were increased due to the addition of ethanol to the absorbent solution. The values of the defined enhancement factor were from 1.047 to 1.143 for the system with DEG solution and from 1.064 to 1.161 for the system with TEG solution. Both driving force and surface tension were important physical properties that affected the mass transfer phenomena of the absorption system. The interfacial disturbance resulting from the addition of ethanol to the absorbent solution can be used to enhance the mass transfer performance for absorption heat pump and absorption air-conditioning systems. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071534c