Sanidhya Painuli, Jayasankar Variyar
Vellore Institute Of Technology, School of Mechanical and Building Sciences, Vandalur Kelambakkam Road, Chennai, India
The study of interaction of fluid with matter assumes great significance for most engineering applications. The flow can be either turbulent or laminar, and different types of interactions arise out of these flow. In the introductory undergraduate course of fluid mechanics, a typical demonstration for these interactions is the Reynolds pipe flow experiment. Instabilities of various types like ...
A. Jash, N. Majumdar, S. Mukhopadhyay, S. Chattopadhyay
Saha Institute of Nuclear Physics, Kolkata, West Bengal, India
Variable Energy Cyclotron Centre, Kolkata, West Bengal, India
Resistive plate chambers (RPC) are fast gaseous detectors, having a simple design and construction, good time resolution and high efficiency. These are extensively used in high energy physics experiments. A large number of RPCs will be used as the main detector element for India’s mega science project, India Based Neutrino Observatory (INO). So, detailed study of this detector is very crucial ...
Zeeko LTD, Coalville, Leicestershire, UK
Chubu University, Kasugai, Aichi, Japan
On one hand, the "float polishing" process consists of a tin lap having many concentric grooves, cut from a flat by single point diamond turning. This lap is rotated above a hydrostatic bearing spindle of high rigidity, damping and rotational accuracy. The optical surface thus floats above a thin layer of abrasive particles. But whilst surface texture can be smoothed to ~0.1nm rms (as measured ...
Influence of Axial Conduction in the Design of a Compact Recuperator for Catalytic Combustor Based Portable Power Generation - new
A. N. Smith, H. Nochetto, C. M. Waits
U.S. Naval Academy, Annapolis, MD, USA
U.S. Army Research Lab, Adelphi, MD, USA
Catalytic micro-combustor represents an exciting area of research for portable power generation. Extensive research is being currently conducted on the design of the reactor and catalyst selection . However another critical element of the design will be a recuperator to minimize losses and provide energy at a more uniform temperature. The mini-recuperator must be both compact and highly ...
C. F. Gomez, R. Schunk, R. F. Coker, J. Knox
NASA Marshall Space Flight Center, Huntsville, AL, USA
The objective of this simulation effort is to develop a mathematical model of vacuum desorption on a POC (Proof of Concept) canister loaded with Zeolite 13X/5A . This canister contains a pelletized adsorption bed which is used to adsorb H2O and CO2. Once this bed is fully saturated with an equilibrium loading, desorption is then accomplished by reducing the pressure to near vacuum. This type of ...
Numerically Closing the Loop of the Adaptive Optics Sensor: the Validation of the COMSOL Multiphysics® Simulation - new
C. Del Vecchio, R. Briguglio, A. Riccardi
National Institute for Astrophysics, Arcetri Astrophysical Observatory, Florence, Italy
As any other modelling of a physical behavior, the numerical simulation of the mechanical response of an adaptive secondary mirror requires that the results match the experimental data. Such an agreement was recently demonstrated for the local mirror stiffness of the LBT and VLT Deformable Mirrors; a reliable modeling is a good tool for the extrapolation of the missing optical data (spider ...
V. Valente, A. Demosthenous, and R. Bayford
Department of Electronic & Electrical Engineering, University College London, London, United Kingdom
Department of Natural Sciences, Middlesex University, London, United Kingdom
Deep Brain Stimulation (DBS) is a therapeutic tool used for a number of neurological disorders including chronic pain, incontinence and movement disorders, such as Parkinson’s disease. DBS consists of the low-frequency stimulation of an area of the brain, known as basal ganglia. The stimulation is provided by clinical implant, consisting of a pulse generator and an electrode lead ...
R. Inglés, J. Pallares, J.L. Ramirez, and E. Llobet
Dept. of Electronic, Electrical and Automatic Control Engineering, Universitat Rovira i Virgili, Tarragona, Spain
Department of Mechanical Engineering School of Chemical
Engineering Universitat Rovira i Virgili, Tarragona, Spain
We use finite elements simulations in order to study the fluid flow behavior in a chamber of a preconcentrator. We realized that most part of the fluid does not affect our preconcentrator because it is going out the chamber at high distance above it and parallel to the preconcentrator. So, we are wasting most part of our fluid and we need a lot of time to have a good concentrator factor. We ...
Variation of the Frost Boundary below Road and Railway Embankments in Permafrost Regions in Response to Solar Irradiation and Winds
N.I. Kömle and W. Feng
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Lanzhou, China
We present COMSOL solutions for a coupled gas flow and heat transfer problem, which occurs particularly when traffic pathways are constructed in high altitude and arctic regions, where the underground is frozen soil. To avoid melting of the frozen ground (which usually leads to mechanical instability) one has to find suitable measures to keep the subsurface soil and the embankment suitably cool. ...
A.W.M. van Schijndel
Eindhoven University of Technology, Eindhoven, The Netherlands
Chaotic systems may lead to instability, extreme sensitivity and performance reduction. Therefore it is unwanted in many cases. Due to these undesirable characteristics of chaos in practical systems, it is important to recognize such a chaotic behavior. The existence of chaos has been discovered in several areas during the last 30 years. However, there is a lack of studies in relation with ...