Thermal Modeling in a Historical Building - Improving Thermal Comfort Through the Siting of a Passive Mass of Phase Change Material
D. Groulx, F. Herbinger, L. Desgrosseilliers
Mechanical Engineering, Dalhousie University, Halifax, NS, Canada
A model of an office room was created in the COMSOL Multiphysics® software to simulate heat transfer and study the impact of siting a mass of phase change material (PCM) in a room to increase thermal comfort. This study determined that incorporating the selected PCM, butyl stearate, in the ceiling and in the floor did not alter the temperature of the room significantly after one hour. ...
M. J. Hancock, N. H. Elabbasi, M. C. Demirel
Veryst Engineering, LLC., Needham, MA, USA
Pennsylvania State University, University Park, PA, USA
Pumping liquids at small scales is challenging because of the principle of reversibility: in a viscous regime, the flow streamlines through a fixed geometry are the same regardless of flow direction. Recently we developed a class of microfluidic pump designs based on tilted flexible structures that combines the concepts of cilia (flexible elastic elements) and rectifiers (e.g., Tesla pump). We ...
Simulation of a New PZT Energy Harvester with a Lower Resonance Frequency Using COMSOL Multiphysics®
H. Elbahr, T. Ali[1,2], A. Badawi, S. Sedky
Zewail City of Science and Technology - Cairo, Cairo, Egypt
Cairo University, Cairo, Egypt
Energy harvesting from environmental vibration nowadays is feasible because of natural oscillations like that caused by air or liquid flow and by exhalation or the heartbeat of a human body. This vibration frequency is typically low (in order of less than 1 kHz). Accordingly, low-frequency vibration based energy harvesting systems are an important research topic; these systems can be used for ...
M. Weschta, S. Tremmel, S. Wartzack
Engineering Design, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Bavaria, Germany
To reduce friction in lubricated tribological contacts, the surfaces of the contacting bodies can be microstructured to improve lubricating conditions. For lower loaded contacts this approach has already reached industrial applications, e.g. the piston-liner contact. For higher loaded contacts the effects are currently in basic research. Elastic deformation in the contact area plays an important ...
E. Aguayo, R. Lyon, M. Helmbrecht, S. Khomusi
The Newton Corporation, Bowie, MD, USA
NASA Goddard Space Flight Center, Greenbelt, MD, USA
Iris AO, Inc., Berkeley, CA, USA
Microelectromechanical systems (MEMS) are becoming more prevalent in today’s space technologies. The Visible Nulling Coronagraph (VNC) instrument, being developed at the NASA Goddard Space Flight Center, uses a MEMS Mirror to correct wavefront errors. This MEMS, the Multiple Mirror Array (MMA), will enable the VNC instrument to detect Jupiter and ultimately Earth size exoplanets. The MMA ...
SPAWAR Systems Center (SSC) ATLANTIC, Charleston, SC, USA
Additive manufacturing uses 3D printing to build physical parts from CAD-based designs. The technology includes fused deposition modeling (FDM) and selective laser sintering (SLS) methods. 3-D printing is of particular interest for smaller, one-of-a-kind, customizable products. A cube satellite (CubeSat) containing fiber reinforced SLS parts has been successfully launched (Ref 1). Lower ...
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 ...
Finite Element Modeling of Conventional and Pulsed Eddy Current Probes for CANDU® Fuel Channel Inspection
M. Luloff, J. Morelli, T. W. Krause
Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, ON, Canada
Department of Physics, Royal Military College of Canada, Kingston, ON, Canada
A pulsed Eddy Current (EC) probe, using the transient response to a stepped voltage is being developed for in-reactor inspection of CANDU® fuel channels. Pulsed EC has the advantage of generating a spectrum of discrete frequencies, allowing the simultaneous collection of data from a range of depths (i.e. takes advantage of multiple skin depths) that is unachievable by conventional EC, which ...
F. Noto, M. Piscopo, L. Celona, D. Cittadino, S. Gammino, G. Cuttone, G. Gallo, G. Schillaci, C. Campisano, L. Lo Nigro, G. Costa, A. Campisano
Laboratorio Nazionale del Sud, Santa Sofia, Catania, Italy
Gravina di Catania, Sicily, Italy
Trinacria, Canalicchio, Catania, Italy
Unico Informatica, li Battiati, Catania, Italy
Different facilities for hadrontherapy have been built in the recent past. AISHa ion source has been designed by keeping in mind the typical requirements of hospital-based facilities, where the minimization of the mean time between failures (MTBF) is a key point together with the maintenance operations which should be fast and easy. The study of some critical parts of the facilities: the ...
Electromagnetic Actuators Modeling, Simulation and Optimization: Review of Methods and Their Application for Switching Devices
O. Craciun, V. Biagini, G. Stengel, C. Reuber, C. Chao, B. Funieru , A. Binder
ABB Corporate Research, Ladenburg, Germany
ABB AG Calor Emag Mittelspannungsprodukte
TU Darmstadt, Department of Electrical Energy Conversion, Darmstadt, Germany
Electromagnetic actuators are representing one important component of ABB's medium voltage reclosers [1, 2]. Their performance is strongly influenced by the considered material properties as well as by the electronic control units that will power the actuator. Depending on the studied phenomena, different modeling, simulation and optimization methodologies are being used for medium voltage ...