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Experimental investigation of a novel polymeric heat exchanger using modified polypropylene hollow fibers / Yuchun Qin in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 882-890 Titre : Experimental investigation of a novel polymeric heat exchanger using modified polypropylene hollow fibers Type de document : texte imprimé Auteurs : Yuchun Qin, Auteur ; Baoan Li, Auteur ; Shichang Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 882-890 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hollow  fiber  Heat  exchanger Résumé : Plastic heat exchangers have attracted more and more attention because of their superior resistance to chemicals and fouling. However, the thermal conductivity of plastic materials is much lower than that of metal, which limits the wider application of plastic heat exchangers. In this study, polypropylene-based hollow fibers as a heat-conducting medium for heat exchangers was developed by melt-mixing polypropylene with graphite particles and maleated polypropylene (PP-g-MA). Results show that the addition of graphite fairly improved the crystalline, thermal stability and conductivity of the polypropylene resin and further improved the heat transfer efficienry of polypropylene-based hollow fiber heat exchangers. The overall heat transfer coefficient of 15.0 wt % graphite modified polypropylene hollow fiber heat exchangers reached 1228.7 W/(m2·K), which is 5 times higher than that of pure PP-based hollow fiber heat exchangers, and the overall conductance per unit volume reached 1.1 × 106 W/(m3·K). Further, the heat transfer efficiency increases fairly with the increase of the fluid flow rate, especially with the flow rate of the tube- side. The optimized operation mode is that the hot water flows on the tube-side and the cold water flows on the shell-side. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476421 [article] Experimental investigation of a novel polymeric heat exchanger using modified polypropylene hollow fibers [texte imprimé] / Yuchun Qin, Auteur ; Baoan Li, Auteur ; Shichang Wang, Auteur . - 2012 . - pp. 882-890. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 882-890 Mots-clés : Hollow  fiber  Heat  exchanger Résumé : Plastic heat exchangers have attracted more and more attention because of their superior resistance to chemicals and fouling. However, the thermal conductivity of plastic materials is much lower than that of metal, which limits the wider application of plastic heat exchangers. In this study, polypropylene-based hollow fibers as a heat-conducting medium for heat exchangers was developed by melt-mixing polypropylene with graphite particles and maleated polypropylene (PP-g-MA). Results show that the addition of graphite fairly improved the crystalline, thermal stability and conductivity of the polypropylene resin and further improved the heat transfer efficienry of polypropylene-based hollow fiber heat exchangers. The overall heat transfer coefficient of 15.0 wt % graphite modified polypropylene hollow fiber heat exchangers reached 1228.7 W/(m2·K), which is 5 times higher than that of pure PP-based hollow fiber heat exchangers, and the overall conductance per unit volume reached 1.1 × 106 W/(m3·K). Further, the heat transfer efficiency increases fairly with the increase of the fluid flow rate, especially with the flow rate of the tube- side. The optimized operation mode is that the hot water flows on the tube-side and the cold water flows on the shell-side. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476421

Investigation of shell side heat transfer in cross - flow designed vacuum membrane distillation module / Bingwei Qi in Industrial & engineering chemistry research, Vol. 51 N° 35 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11463-11472 Titre : Investigation of shell side heat transfer in cross - flow designed vacuum membrane distillation module Type de document : texte imprimé Auteurs : Bingwei Qi, Auteur ; Baoan Li, Auteur ; Shichang Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 11463-11472 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Membrane  separation  Membrane  distillation  Design  Crossflow  Heat  transfer Résumé : This paper focuses on the investigation of heat transfer in a cross-flow designed vacuum membrane distillation (VMD) module. The employment of cross-flow membrane module could ensure significant reduction of temperature polarization effect at a relatively low range of Reynolds numbers. According to most literature on VMD, the heat transfer coefficients are usually estimated by the commonly used correlations for nonporous and rigid heat exchangers. However, due to the complex flow regime in module channel, the applicability of these formulas is questioned. In this work, the heat transfer in the shell side of VMD module was studied numerically and experimentally in the Reynolds range from 7.12 to 52.18. The experimental Nusselt numbers obtained in this work are relatively higher than those predicted in the literature for given conditions. The possible reasons leading to the considerable enhancement of heat transfer are analyzed and discussed. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26324795 [article] Investigation of shell side heat transfer in cross - flow designed vacuum membrane distillation module [texte imprimé] / Bingwei Qi, Auteur ; Baoan Li, Auteur ; Shichang Wang, Auteur . - 2012 . - pp. 11463-11472. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11463-11472 Mots-clés : Membrane  separation  Membrane  distillation  Design  Crossflow  Heat  transfer Résumé : This paper focuses on the investigation of heat transfer in a cross-flow designed vacuum membrane distillation (VMD) module. The employment of cross-flow membrane module could ensure significant reduction of temperature polarization effect at a relatively low range of Reynolds numbers. According to most literature on VMD, the heat transfer coefficients are usually estimated by the commonly used correlations for nonporous and rigid heat exchangers. However, due to the complex flow regime in module channel, the applicability of these formulas is questioned. In this work, the heat transfer in the shell side of VMD module was studied numerically and experimentally in the Reynolds range from 7.12 to 52.18. The experimental Nusselt numbers obtained in this work are relatively higher than those predicted in the literature for given conditions. The possible reasons leading to the considerable enhancement of heat transfer are analyzed and discussed. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26324795