{"title":"Mass Transfer and Multiphase Flow of Long-Arm Pitched Paddle Impeller at High Gas Flow Rates","authors":"Jolius Gimbun","doi":"10.1002/cite.70098","DOIUrl":"https://doi.org/10.1002/cite.70098","url":null,"abstract":"<div>\u0000 \u0000 <p>This study examines gas–liquid stirred tanks using Rushton-type and long-armed pitched paddle (LAPP) impellers at 0.35–1.1 VVM. Particle image velocimetry revealed up to 42% reductions in turbulent kinetic energy and radial velocity at high aeration from bubble–liquid interactions. The LAPP achieved up to 41% higher mass transfer coefficients than the Rushton at similar <i>P<sub>g</sub></i>/<i>V</i>, showing superior energy efficiency. Aerated power draw and flow regime transitions were correlated with Froude and aeration numbers, and a generalized correlation for mass transfer coefficients was developed from <i>P<sub>g</sub></i>/<i>V</i> and aeration number. Results support improved design and scale-up of gas–liquid reactors, emphasizing the benefits of advanced impeller geometries.</p>\u0000 </div>","PeriodicalId":9912,"journal":{"name":"Chemie Ingenieur Technik","volume":"98 8","pages":"507-513"},"PeriodicalIF":1.6,"publicationDate":"2026-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148662343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Philipp Karsten Niebel, Violetta Schumm, Mareen Zöllner, Thomas Krampitz, Holger Lieberwith, Marcel Zeisberg, Enrico Baumgärtel, Jens Bachmann
{"title":"Vergleichende Untersuchung der Eigenschaften recycelter Kohlenstofffasern\u0000 Comparative investigation of the properties of recycled carbon fibers","authors":"Philipp Karsten Niebel, Violetta Schumm, Mareen Zöllner, Thomas Krampitz, Holger Lieberwith, Marcel Zeisberg, Enrico Baumgärtel, Jens Bachmann","doi":"10.1002/cite.70081","DOIUrl":"https://doi.org/10.1002/cite.70081","url":null,"abstract":"<p>Carbon fibers (CF) give carbon fiber reinforced plastics (CFRP) its excellent strength properties despite its low density. In order to reduce the energy consumption and the greenhouse gas emissions caused by CF production, the substitution of the virgin CF (vCF) by recycled CF (rCF) recovered with a lower energy requirement is targeted. The application of rCF in industry requires a uniform and standardized fiber quality across batches. In this regard, this article's aim is to compare for example the mechanical properties and the state of the fiber surface of vCF and rCF recovered by different recycling methods based on different fiber characterization methods. Furthermore, potentials for the optimization of CFRP recycling processes are derived.</p>","PeriodicalId":9912,"journal":{"name":"Chemie Ingenieur Technik","volume":"98 8","pages":"485-494"},"PeriodicalIF":1.6,"publicationDate":"2026-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cite.70081","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148662033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}