Modeling of Porous Catalyst Pellets: Comparison of Diffusion Flux Models for Steam Methane Reforming
P. L. Mills , L. Olabanji , A. Nagaraj , A. Nanduri ,
 Department of Chemical and Natural Gas Engineering, Texas A&M University - Kingsville, Kingsville, TX, USA
Introduction Steam reforming of natural gas has been the most common method for producing synthesis gas (CO + H2) for the production of H2, MeOH and NH3 for over half a century . Production of H2 in the USA using steam methane reforming (SMR) is ca. 9 MM tons/yr. Global production of NH3 using H2 derived from SMR was ca. 109 MM/yr in 2004. In the chemical industry, the SMR process is ...
H. van Halewijn ,
 Fontys University of Applied Physics, The Netherlands
At the Fontys University of Applied Physics (The Netherlands) a plasma etcher has been acquired for educational purposes. The machine operates at low power up to 30 Watt and is driven with a magnetic coil at 13.56 MHz. The use of COMSOL Multiphysics software will be discussed to simulate the temperature and mass fractions of the activated and ionized atoms in the gas. The simulations will be ...
现在 COMSOL Multiphysics® 中对时域问题的处理大多数通过离散时间来处理，比如微波炉中加热一杯水，杯壁由两半不同介电常数的玻璃组成，杯子在托盘带动下旋转，对杯子中的水进行受热分析。传统的解法是将要分析的过程离散为一定步长的时间点，每算完一个时间点将杯子旋转一定的角度，然后在求解器中设置此次计算结果作为下一个时间点的初值。如果时间步长足够短，便可以模拟水的受热情况。这种做法的不足之处是需要调用 MATLAB 联合求解，计算时间较长。而且还有一个问题是在不同的时间点，由于场分布不同，杯子的位置不同，COMSOL 中剖分的网格应该是不同的，不同的网格节点值如何映射是 COMSOL 中没有解决的问题。我们如果能够把杯子位置的改变转化为对应节点上物质属性参数的变化，将杯子的旋转等效为杯子不动，而杯壁的介电常数随时间周期变化 ...
Senior Materials Scientist, NASA Marshall Space Flight Center
A scientific hypothesis states that cryogenic trapped water is just under the surface of lunar soil at the poles in permanently shadowed craters. Microwave energy can be used to efficiently extract this water from permafrost. COMSOL permits calculation of the heating of simulated lunar soil using measured temperature dependent dielectric properties. Calculations at different microwave ...
R. Prakash, K. M. V. Swamy, and B. G. Sheeparamatti
Basaveshwara Engineering College
MEMS(Microelectromechanical systems) based energy harvesting is process of extracting energy from natural resources in small amounts. Here, number of (millions) small energy harvesting modules lead to substancial energy. In this design, a piezoelectric material is used to scavenge energy from natural resources like radioactive source. COMSOL Multiphysics is used to model and simulate a ...
F. Chen, T. Gulati, H. Zhu, A. K. Datta
Cornell University, Ithaca, NY, USA
This research studies the thermal effect of frozen pie heating in the microwave oven. Considering as composite material, the properties of pie derived based on its composition. Here the package, susceptor’s influence to the temperature distribution is also studied.
University of Minnesota-Duluth, Duluth, MN, USA
Significant submarine mineral deposits form when hot, metal-laden, saline fluids emerge onto the seafloor and mix with ambient seawater. Resulting density changes of fluid mixtures can trigger fluid buoyancy reversals, brine pool formation, and metal accumulation (Figure 1). While some of these processes are known from experiments, the inception, development, and physical-chemical processes ...
Modelling of Reactive Non-Isothermal Mixture Flow and its Simulation in COMSOL Multiphysics® Software - new
V. Orava[1,2], O. Soucek, P. Cedula
Charles University in Prague, Prague, Czech Republic
Zurich University of Applied Sciences, Winterthur, Switzerland
I introduce a model of fluidized reactor which, in presence of heterogeneous platinum-based catalyst, decomposes liquid formic acid producing gaseous mixture of carbon dioxide and hydrogen as the product. I treat the physical system as a (Class II) mixture of four constituents - namely formic acid (FA), Platinum micro-pellets (Pt), carbon dioxide (CO_2) and hydrogen (H_2) - which can be, without ...
M. A. Narbut , K. V. Titov , P. K. Konosavsky ,
 Saint Petersburg State University, Saint Petersburg, Russia
The groundwater flow is accompanied by the electric field with potential called usually the streaming potential or the Self-Potential (SP) to be measured on the ground surface (e.g., Rizzo et al., 2004; Bolève et al., 2007; Jardani et al., 2009). We studied numerically the SP signals associated with pumping test experiments in layered aquifers using COMSOL Multiphysics® software and GWFGEM ...
H. Chen , J. Li , S. Xia ,
 Hunan University, Changsha, Hunan, China
 Xi'an Jiaotong University, Xi'an, Shaanxi, China
Introduction In order to understand the detection mechanism of the PZT based nondestructive testing (NDT) technology for interface debonding of CFSTs, numerical simulation on a multi-physical model composed of surface-mounted PZT patches and CFST structural member is established in COMSOL Multiphysics®. The stress propagation process and the electrical signal output of an embedded PZT patch as ...