Article
Engineering, Chemical
Ruixu Wang, Ziliang Wang, Xiaotao Bi, C. Jim Lim, Shahabaddine Sokhansanj
Summary: A prototype horizontal pulsed fluidized bed (HPFB) was constructed for continuous biomass torrefaction in this study. The solids residence time distribution (RID) of hemlock sawdust in the HPFB reactor was measured to investigate particle transport and mixing. The experimental results showed that the horizontal dispersion coefficients in the HPFB were influenced by weir height, gas pulsation frequency, solids feed rate, and gas velocity. The obtained horizontal solids dispersion coefficients in the HPFB were significantly smaller than values calculated by literature correlations.
Article
Chemistry, Multidisciplinary
Yonghee Shin, Youngwook Lim, Taejin Kwak, Jeong Ha Hwang, Andrei Georgescu, Dongeun Huh, Dongchoul Kim, Taewook Kang
Summary: This study presents a method for seed-mediated growth of core-shell nanoparticles in a microfluidic reactor, achieving uniform metal core-shell nanoparticles production with the use of specific microstructures for multi-scale homogeneous mixing and preventing long residence time of nanoparticles. The proposed microfluidic synthesis produces core-shell nanoparticles with a more uniform shell size compared to conventional batch synthesis.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Engineering, Chemical
Mingheng Li
Summary: This study utilizes Computational Fluid Dynamics (CFD) to analyze the residence time distribution (RTD) in a commercial RO channel and finds differences from analytical solutions for flat channels, primarily due to the existence of spacer filaments in the RO channel. Experimental results show the purging efficiency after one displacement volume.
Article
Engineering, Chemical
Nirvik Sen, Dnyaneshwar Tat, K. K. Singh, A. K. Goswami, S. Mukhopadhyay, K. T. Shenoy
Summary: A novel microfluidic header is proposed for scaling-up microbore tube-based applications of chemical microprocessing. Experimental and simulation studies demonstrate that the header can achieve high flow distribution and mixing efficiency.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Nanoscience & Nanotechnology
Xianglong Pang, Mei Duan, Heng Liu, Yuhang Xi, Haixiao Shi, Xiaoguang Li
Summary: Droplet-based microreactors, such as liquid marbles, have diverse functionality and potential applications in various fields. This study demonstrates a controllable approach of subjecting liquid marbles to vertical oscillations using audio signals, which allows for sufficient mixing and regulation of material structures. The flexibility and high efficiency of this oscillation method make it a verified manipulation strategy for advancing the functionality of liquid marble microreactors.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Medicinal
Kai T. Lee, James A. Kimber, Giuseppe Cogoni, Jenna K. Brandon, David Wilsdon, Hugh M. Verrier, Sally Grieb, Daniel O. Blackwood, Ashwinkumar C. Jain, Pankaj Doshi
Summary: Continuous powder mixing technology (CMT) is a leading technology in the development and manufacture of solid oral dosage forms, allowing independent selection of target set points for mixing parameters. The study shows that mixing performance is influenced by parameters like impeller speed, hold up mass, and process throughput, while the impact of material attributes like API particle size and bulk properties on mixing performance is insignificant.
JOURNAL OF PHARMACEUTICAL SCIENCES
(2021)
Article
Engineering, Chemical
Ariane Berard, Bruno Blais, Gregory S. Patience
Summary: RTD method can effectively detect hydrodynamic anomalies in reactors, including the impact of gas diffusivity and intraparticle porosity on residence time. The experimental results suggest that gas diffusivity and particle characteristics should be considered when selecting tracer gases.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Engineering, Chemical
Gary J. Brown, David F. Fletcher, Jeremy W. Leggoe, David S. Whyte
Summary: The study investigated residence time and mixing time predictions using two hybrid RANS-LES models (SBES and SST-SAS), compared with experimental data and URANS approaches. The results showed that the hybrid models were more accurate in predicting residence and mixing time, and practical for industrial simulations.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Chemical
N. Pailahueque, A. Reyes, L. Henriquez-Vargas, M. Gil, P. Castro, V. Bubnovich
Summary: Fluid dynamic characterization was carried out for a set of three serial rectangular based spouted beds using sawdust or turnip seeds. Parameters such as spouting velocity and pressure drop were determined, and residence time distribution was analyzed using colored particles. The effects of solids feed rate, air flow, and moisture content on solid RTD were found to be significant.
Article
Chemistry, Medicinal
Troels Pedersen, Anssi-Pekka Karttunen, Ossi Korhonen, Jian Xiong Wu, Kaisa Naelapaa, Erik Skibsted, Jukka Rantanen
Summary: This study investigated the residence time distribution in a continuous powder mixing process using pulse tracer experiments and near infrared spectroscopy. Chemometric modeling approaches, including partial least squares discriminant analysis and principal component analysis, were applied to efficiently estimate the mean residence time based on pulse tracer experiments.
JOURNAL OF PHARMACEUTICAL SCIENCES
(2021)
Article
Engineering, Chemical
Saeed Mahdavy, Hamid Reza Norouzi, Christian Jordan, Bahram Haddadi, Michael Harasek
Summary: This study characterizes the motion of non-spherical particles with sharp edges using residence time distribution (RTD) measurement in a continuous drum. The effects of rotation speed, incline angle, feed rate, and mixture composition on the RTD were investigated. The study also found that the average residence time of particles with sharp edges depends on rotation speed and incline angle, while the effects of feed rate and particle size are minimal.
Article
Engineering, Environmental
S. Tomasi Mason, M. Antognoli, A. Mariotti, R. Mauri, M. V. Salvetti, C. Galletti, E. Brunazzi
Summary: This study investigates the impact of flow regimes on the reaction yield in an X-microreactor through experimental flow visualizations and numerical simulations. The results show a remarkable agreement between the experimental and numerical findings. The reaction yield increases with the Reynolds number in the engulfment regime, but reaches a maximum and slightly decreases thereafter. The reaction yield in the X-microreactor is significantly higher than that in a T-microreactor with the same cross-section geometry and operating conditions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Analytical
Mario Pichler, Bahram Haddadi, Christian Jordan, Hamidreza Norouzi, Michael Harasek
Summary: Rotary kilns are commonly used in industry for various operations, and the influence of particle residence time distribution on biomass pyrolysis in such kilns has been numerically investigated in this study. By comparing different modeling approaches and parameters, it was found that neglecting particle residence time distribution may not always be a valid assumption under certain operating conditions.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Engineering, Environmental
Wladislaw Dolshanskiy, Alexey Stepanyuk, Elias Arian, Werner Pauer
Summary: This study investigated the behavior of aqueous solutions in an industrially available dynamic inline-mixer. The results show that micromixing processes are particularly complex in a continuous rotor-stator mixer and that the injection inlet has a decisive influence on micromixing efficiency. Surprisingly, backmixing was identified as a factor that significantly extends the micromixing time.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Chao Zheng, Ling Zhang, Nicolin Govender, Chuan-Yu Wu
Summary: This study systematically analyzed the twin screw granulation (TSG) process using a discrete element method, investigating the particle flow behavior and residence time. Results showed that particle size and screw speed affected the flow behavior and residence time of particles in TSG. Larger particles in TSG had similar residence time with narrower spread at higher screw speeds.
Article
Biochemical Research Methods
Christian Leiterer, Erik Wuensche, Prabha Singh, Jens Albert, Johann M. Koehler, Volker Deckert, Wolfgang Fritzsche
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2016)
Article
Engineering, Environmental
Matthias Thiele, Joanne Zi En Soh, Andrea Knauer, Daniell Malsch, Ondrej Stranik, Robert Mueller, Andrea Csaki, Thomas Henkel, J. Michael Koehler, Wolfgang Fritzsche
CHEMICAL ENGINEERING JOURNAL
(2016)
Article
Polymer Science
Nikunjkumar Visaveliya, Andrea Knauer, Wei Yu, Christophe A. Serra, J. Michael Koehler
EUROPEAN POLYMER JOURNAL
(2016)
Article
Chemistry, Physical
Nikos G. Tsierkezos, Max Puschner, Uwe Ritter, Andrea Knauer, Lars Hafermann, J. Michael Koehler
Article
Chemistry, Applied
Claudia Lenk, Carlos Mattea, Siegfried Stapf, J. Michael Koheler
JOURNAL OF POROUS MATERIALS
(2017)
Article
Polymer Science
Nikunjkumar Visaveliya, Andrea Knauer, Johann Michael Koehler
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2017)
Article
Biotechnology & Applied Microbiology
Jialan Cao, Lars Hafermann, J. Michael Koehler
ENGINEERING IN LIFE SCIENCES
(2017)
Article
Biochemical Research Methods
Matthias Thiele, Andrea Knauer, Daniell Malsch, Andrea Csaki, Thomas Henkel, J. Michael Koehler, Wolfgang Fritzsche
Article
Polymer Science
Nikunjkumar R. Visaveliya, Xiang Li, Andrea Knauer, Bhagavatula L. V. Prasad, Johann Michael Kohler
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2017)
Review
Chemistry, Multidisciplinary
Nikunjkumar R. Visaveliya, Christopher W. Leishman, Kara Ng, Nicolas Yehya, Nelson Tobar, Dorthe M. Eisele, Johann Michael Kohler
ADVANCED MATERIALS INTERFACES
(2017)
Article
Environmental Sciences
Johann Michael Koehler, Franziska Kalensee, Peter Mike Guenther, Tim Schueler, Jialan Cao
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH
(2018)
Article
Nanoscience & Nanotechnology
J. Michael Koehler, Danja Kuhfuss, Phillip Witthoeft, Martina Hentschel, Andrea Knauer
JOURNAL OF NANOMATERIALS
(2018)
Article
Chemistry, Multidisciplinary
Johann Michael Koehler, Andrea Knauer
APPLIED SCIENCES-BASEL
(2018)
Article
Nanoscience & Nanotechnology
Xiang Li, Nikunjkumar R. Visaveliya, Lars Hafermann, Andrea Knauer, Steffen Schneider, J. Michael Koehler
ACS APPLIED NANO MATERIALS
(2018)
Article
Engineering, Environmental
Xiang Li, Nikunjkumar Visaveliya, Lars Hafermann, G. Alexander Gross, Andrea Knauer, J. Michael Koehler
CHEMICAL ENGINEERING JOURNAL
(2017)