Three-Dimensional Percolation Properties Simulation of a Marine Coating Based on Its Real Structure Obtained from Ptychographic X-Ray Tomography - new
B. Chen, M. Guizar-Sicairos, G. Xiong, L. Shemilt, A. Diaz, J. Nutter, N. Burdet, S. Huo, F. Vergeer, A. Burgess, I. Robinson
London Centre for Nanotechnology, University College London, London, UK
Paul Scherrer Institute, Villigen, Switzerland
AkzoNobel Co. Ltd., Sassenheim, Netherlands
AkzoNobel (UK) Co. Ltd., Tyne and Wear, UK
We present quantitative nano-scale analysis of the 3D spatial structure of an anticorrosive aluminium epoxy barrier marine coating obtained by ptychographic X-ray computed tomography (PXCT) [1-3]. We then use COMSOL Multiphysics® software to perform simulations on the acquired real 3D structure to demonstrate how percolation through this actual 3D structure impedes ion diffusion in the ...
B. Niu, W. Yan, A.A. Shapiro, and E.H. Stenby
Department of Chemical and Biochemical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
As an effective method to cope with green-house gas emission, and to enhance oil recovery, injection of carbon dioxide into oil reservoirs has obtained increasing attentions. The flooding process involves complex phase behavior among oil, brine and CO2, and geochemical reaction between CO2 and rock. COMSOL Multiphysics® was first applied to simulating two flooding processes with known ...
朱铧丞 , 张春 , 叶菁华 ,
微波作为信息和能量的载体具有同等重要的应用价值，利用微波对物质产生的物理化学效应进行能量传递及转换已经在化学领域有了积极的应用。从 1986 年 R.N. Gedye 等人首次使用微波促进化学反应使其反应速率提高 1240 倍以来，有越来越多的微波和化学领域的科学家对相关问题进行了研究，并出现了一门新兴学科“微波化学”。微波化学作为研究微波能的一个方面是研究微波与化学反应体系相互作用的一个新兴学科。由于当前人们对微波加快化学反应的研究还非常肤浅，微波在大规模应用中并未发挥出其应有的巨大优势，微波化学进一步发展面临着巨大的挑战和机遇。目前微波化学的研究可以分为宏观和微观两个层面：（1）在宏观层面人们并不关心微波对分子之间行为的影响，其研究要用多物理场数值计算方法获得反应体系中电磁场、温度等物理量的分布和变化；（2）微观层面的研究，重点关注微波对反应分子之间相互作用的影响 ...
N. Ghasem , M. Al-Marzouqi ,
 UAE University, Al-Ain, UAE
 UAE University, Al-Ain, UAE
Greenhouse gases trap heat and make the planet warmer. The main greenhouse gases emitted by human activities are: Carbon dioxide (CO2). The use of fossil fuel is the primary source of CO2 [1, 2]. Accordingly, there is a need for an efficient and novel separation processes for removal of carbon dioxide from gas streams [3, 4]. Here, a flat sheet membrane contactor is used to remove carbon ...
L. T. Gritter , E. Dunlop , J. S. Crompton , K. C. Koppenhoefer 
 AltaSim Technologies, Columbus, OH, USA
 Pan Pacific Technologies Pty Ltd, Adelaide, South Australia, Australia
Photo-bioreactors generate biomass by providing a controlled environment for the cultivation of algae due to photosynthesis. Algae cultivation can be controlled through the operating parameters and bioreactor environment to allow for high productivity and the use of systems with large surface-to-volume ratios offers maximum efficiency in the use of light compared to alternative batch systems. ...
A. Warning, A. K. Datta
Department of Biological & Environmental Engineering, Cornell University, Ithaca, NY, USA
Predictive food microbiology currently first requires experimental data for growth on fresh produce and then fitting an empirical or semi-empirical model to the data, making extrapolation to other conditions (temperature, type of produce) difficult. Herein, we develop a mechanistic model for the growth of human pathogenic bacteria (Escherichia coli O157:H7 and Salmonella spp.) on spinach using ...
F. Zonfrilli, V. Guida, L. Scelsi
Procter & Gamble Italia, Pomezia, Roma, Italy
Powder detergents containing sodium percarbonate and bleach activators undergo chemical decomposition when exposed to high relative humidity. Controlling the moisture intake in finished product packs is therefore a fundamental need in order to guarantee product stability during the whole supply chain. In this paper we show how we have leveraged COMSOL Multiphysics capability in order to model ...
M. Al-Rawashdeh[1,2], V. Hessel[1,2], P. Löb, and F. Schönfeld
Institut für Mikrotechnik Mainz GmbH, Mainz, Germany
Department of Chemical Engineering and
Chemistry, Eindhoven University of Technology, Eindhoven, Netherlands
Gas-liquid falling film microreactors carry out fast exothermic and mass transfer limited reactions. Since the major rate limiting steps occur on the liquid side, it is important to account for a realistic liquid film profile within the reactor simulation. Based on realistic channel geometry and liquid menisci profiles, we describe the liquid film thicknesses, flow velocities, species transport ...
A.E. Idiart, M. Pekala, A. Nardi, D. Arcos
Amphos 21, Barcelona, Spain
The Swedish Organization for Radioactive Waste (SKB) is considering disposal High Level Wastes in a deep underground repository. Bentonite clay is planned to be used in the near-field of the waste packages as buffer material. The buffer is expected to provide a favorable environment with limited radionuclide migration due to slow diffusion and retardation by sorption and cation-exchange effects. ...
N. Lawand, V. Lopez[1,2], P. French
Delft University of Technology, Delft, The Netherlands
Università degli studi di Napoli "Federico II", Naples, Italy
Cochlear Implants (CIs) are implantable prostheses that bypass the non-functional inner ear and directly stimulate the auditory nerve with electric currents, enabling deaf people to experience sound again. The CI electrode array sits inside the cochlea close to the auditory neurons. An ideal stimulation material must have low impedance with maximum charge transfer capacity in the electrochemical ...