Documents disponibles écrits par cet auteur

Effects of orifice angle and surface roughness on the bubbling - to - jetting regime transition in a bubble column / Carlos Irrgang in Industrial & engineering chemistry research, Vol. 51 N° 11 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 11 (Mars 2012) . - pp. 4445-4451 Titre : Effects of orifice angle and surface roughness on the bubbling - to - jetting regime transition in a bubble column Type de document : texte imprimé Auteurs : Carlos Irrgang, Auteur ; Olaf Hinrichsen, Auteur ; Raymond Lau, Auteur Année de publication : 2012 Article en page(s) : pp. 4445-4451 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Bubble  column  Bubbling  Roughness Résumé : Submerged gas injection into liquids is a widely applied processing technique. The main objective of the current study was to determine the effects of orifice angle and orifice surface roughness on the bubbling-to-jetting regime transition in a bubble column. The bubbling behaviors at single-orifice distributors were investigated over a wide range of orifice gas velocities. The pressure fluctuations in the plenum and high-speed image sequence of the bubble emerging process at the orifice were recorded in experiments. Both orifice angle and orifice surface roughness were found to have significant effects on the regime-transition velocity between the bubbling and jetting regimes. Models were also developed by incorporating those available in the literature with the experimental results obtained in the current study. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25655653 [article] Effects of orifice angle and surface roughness on the bubbling - to - jetting regime transition in a bubble column [texte imprimé] / Carlos Irrgang, Auteur ; Olaf Hinrichsen, Auteur ; Raymond Lau, Auteur . - 2012 . - pp. 4445-4451. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 11 (Mars 2012) . - pp. 4445-4451 Mots-clés : Bubble  column  Bubbling  Roughness Résumé : Submerged gas injection into liquids is a widely applied processing technique. The main objective of the current study was to determine the effects of orifice angle and orifice surface roughness on the bubbling-to-jetting regime transition in a bubble column. The bubbling behaviors at single-orifice distributors were investigated over a wide range of orifice gas velocities. The pressure fluctuations in the plenum and high-speed image sequence of the bubble emerging process at the orifice were recorded in experiments. Both orifice angle and orifice surface roughness were found to have significant effects on the regime-transition velocity between the bubbling and jetting regimes. Models were also developed by incorporating those available in the literature with the experimental results obtained in the current study. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25655653

Micromixing Efficiency of a Spinning Disk Reactor / Nikolas C. Jacobsen in Industrial & engineering chemistry research, Vol. 51 N° 36 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11643-11652 Titre : Micromixing Efficiency of a Spinning Disk Reactor Type de document : texte imprimé Auteurs : Nikolas C. Jacobsen, Auteur ; Olaf Hinrichsen, Auteur Année de publication : 2012 Article en page(s) : pp. 11643-11652 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Reactor  Micromixing Résumé : This work presents the experimental investigation of the micromixing characteristics of a spinning disk reactor (SDR) by using a system of competitive parallel reactions, particularly the iodide―iodate reaction (Villermaux―Dushman reaction). The objective of this study is to analyze the influence of various operating parameters such as the rotational speed of the disk, the feed location, and the surface structure of the disk on the mixing quality. It is shown that the micromixing efficiency can be particularly controlled by variation of the disk speed. These results are further validated by the investigation of the precipitation reaction of barium sulfate. This synthesis offers fast reaction kinetics with induction times in the range of milliseconds, resulting in a mixing time which lies in the range of this for efficient mixers like microreactors. The use of the spinning disk technology enables one to produce particles continuously with controllable mean sizes down to 27 nm, without the risk of fouling or blocking. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26350330 [article] Micromixing Efficiency of a Spinning Disk Reactor [texte imprimé] / Nikolas C. Jacobsen, Auteur ; Olaf Hinrichsen, Auteur . - 2012 . - pp. 11643-11652. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11643-11652 Mots-clés : Reactor  Micromixing Résumé : This work presents the experimental investigation of the micromixing characteristics of a spinning disk reactor (SDR) by using a system of competitive parallel reactions, particularly the iodide―iodate reaction (Villermaux―Dushman reaction). The objective of this study is to analyze the influence of various operating parameters such as the rotational speed of the disk, the feed location, and the surface structure of the disk on the mixing quality. It is shown that the micromixing efficiency can be particularly controlled by variation of the disk speed. These results are further validated by the investigation of the precipitation reaction of barium sulfate. This synthesis offers fast reaction kinetics with induction times in the range of milliseconds, resulting in a mixing time which lies in the range of this for efficient mixers like microreactors. The use of the spinning disk technology enables one to produce particles continuously with controllable mean sizes down to 27 nm, without the risk of fouling or blocking. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26350330