M. Teutli , Jiménez, Lozano, Peláez, J. Roque, and I. González
BUAP, Puebla, Mexico
Universidad Veracruzana, Xalapa, VZ, Mexico
UAM, Mexico City, Mexico
A 3-D model for compost was constructed taking as geometry basis a truncated cone, with dimensions of 4 m radius and 3 m height; in this structure an energy balance is applied for a two phase system (solid-air). Compost energy processes are modeled using COMSOL with a modified heat transfer equation which includes: volumetric heat capacity, chemical oxidation and biological growing and ...
S. Maloney[1,2], Y. Li[1,2], G. Auner, and J. Smolinski
Wayne State University, Detroit, MI, USA
Lawrence Technological University, Southfield, MI, USA
We are working on a microfabricated lysing chip that uses a piezoelectric actuator to provide ultrasonic energy to break apart cells. The device contains pillars with varying dimensions. We hypothesize that increasing the aspect ratio of pillars will increase the efficiency of the transfer of ultrasonic energy into the fluid phase and enhance the lysing efficiency. The fluid structure ...
Evaluation of COMSOL as a Tool for Pinpointing Moisture Entering Locations From Inside Surface Moisture
J. van Schijndel
Eindhoven University of Technology, Eindhoven, Netherlands
The location and nature of the moisture leakages are sometimes difficult to detect. Moreover, the relation between observed inside surface moisture patterns and where the moisture enters the construction is often not clear. The objective of this paper is to investigate inverse modeling techniques as a tool for the detection of moisture leakage locations in building constructions from inside ...
Homogeneous and Inhomogeneous Model for Flow and Heat Transfer in Porous Materials as High Temperature Solar Air Receivers
O. Smirnova, T. Fend, P. Schwaryboezl, and D. Schoellgen
German Aerospace Center, Institute of Technical Thermodynamics, Koeln, Germany
Results of simulations on flow and heat transfer in a porous Silicon Carbide honeycomb structure applied as a solar air receiver are presented. In this application porous materials are put in concentrated solar radiation. Flux densities of up to 1000 MW/m² are reached. Simultanously, ambient air flows through the material to be heated up to temperatures of app. 800°C. This hot air is then used ...
S. Cavadias , B. Trifi , S. Ognier, and N. Bellakhal
Laboratoire de Génie des Procédés Plasma et Traitement de Surface, Ecole Nationale Supérieure de Chimie de Paris, Université Pierre et Marie Curie, Paris, France
Laboratoire de Chimie Analytique et Electrochimie, Département de Chimie, Faculté des Sciences de Tunis, Université Tunis El Manar, Tunis, Tunisie
Département de Chimie et de Biologie Appliquées, Institut National des Sciences Appliquées et de Technologie, B.P. N°676, 1080 Tunis Cedex, Tunis, Tunisie
The use of plasmas for the treatment industrial effluents provides a new alternative to the decontamination of wastewater. The strong oxidizing species (O,O3, OH) generated by the plasma, at room temperature, can oxidise organic pollutants present in the water. Our simulation deals with the degradation of methyl red by a Glidarc humid air plasma producing active species, mainly OH, that can ...
An Analysis of Spin-Diffusion Dominated Ferrofluid Spin-Up Flows in Uniform Rotating Magnetic Fields
S. Khushrushahi, A. Guerrero, C. Rinaldi, and M. Zahn
Massachusetts Institute of Technology, Cambridge, MA
Univeridad Industrial de Santander, Bucaramanga, Colombia
University of Puerto Rico, Mayaguez, Mayaguez, PR
This work analyzes the spin-diffusion dominated explanation for spin-up bulk flows in ferrofluid filled cylinders, with no free surface, subjected to a uniform rotating magnetic field. COMSOL results are compared to experimental results and analytical results. Simulating ferrofluid spin-up flows have many subtleties, especially when using a single domain region to model the ferrofluid ...
S. Lazzari, E. Zanchini
DIENCA - University of Bologna, Bologna, Italy
A design method for BHE fields in the absence of groundwater flow is presented, based on the superposition of effects. The effects of any periodic heat load with a period of one year can be obtained by a weighted sum of the effects of a monthly unit step heat load, properly displaced in time. The interference among BHEs is evaluated by the superposition of effects in space. The result of the ...
Department of Biomedical Engineering, Yonsei University, Seoul, South Korea
Dielectrophoresis is a phenomenon in which a force is exerted on a dielectric particle when it is subjected to a non-uniform electric field. In this research, we analyze dielectrophoretic (DEP) force using a geometry containing two electrodes, one with SiO2 and one without, with a gap between them. The relevant governing equations include the DEP force, the electrohydrodynamic and corresponding ...
J. Font-Capó, A. Nardi, M. Mendoza , E. Ruiz, S. Jordana, J. Molinero, P. Trinchero, J. Vargas
Amphos 21 Consulting, Barcelona, Spain
Amphos 21 Perú, Lima, Perú
Worley Parson/TWP, Lima, Perú
Some of the present metallic ores mines are located in areas formed by a heterogeneous fractured massif where groundwater flows preferentially through fractures. Underground mining in these zones can cause impacts in streams, lakes and change the natural water balance of the watersheds, leading to conflicts between traditional uses of water and the mining activity. Quantification of these ...
F. Ferrero, M. Kluge, R. Zeps, T. Spoormaker
BAM Federal Institute for Materials Research and Testing, Berlin, Germany
Chairman PlasticsEurope Fluoropolymers TFE Safety Task Force, Du Pont De Nemours, Dordrecht, The Netherlands
The self-ignition of tetrafluoroethylene (TFE) caused by contact with hot surfaces has been analyzed with the help of simulations performed with COMSOL Multiphysics®. The current study focuses on large-scale heated reactors for the industrial production of polytetrafluoroethylene (PTFE) from TFE at high pressures. Simulations of the self-heating and consequent self-ignition of TFE in a 100-dm3 ...