R. P. Ruby, G. Kulkarni, U. Kanade
Noumenon Multiphysics Pvt. Ltd., Pune, Maharashtra, India
Seals leak primarily at the interface between seal and cavity (Figure 1). At a microscopic level, the interface between the seal and cavity consists of regions of contact between the two elements, and voids. The voids are connected to each other, forming a microscopic system of caverns through which the leaking fluid flows (Figure 2). In two previous papers, we investigated the microgeometry of ...
P.K. Jain, V.B. Khane, J.D. Freels
Oak Ridge National Laboratory, Oak Ridge, TN, USA
Missouri University of Science and Technology, Rolla, MO, USA
Simulation models for steady state thermal hydraulics analyses of ORNL’s HFIR have been developed using COMSOL. A single fuel plate and coolant channel of each type of HFIR fuel element was modeled in three dimensions. The standard k-? turbulence model was used in simulating turbulent flow with conjugate heat transfer. The COMSOL models were developed to be fully parameterized to allow ...
S. Durand[1,3], C. Dubois, P. Lafleur, V. Panchal, D. Park, D. Lepage, P. Paradis
École Polytechnique de Montréal, Montréal, QC, Canada
US Army ARDEC, Picatinny Arsenal, NJ, USA
General Dynamics OTS Canada Valleyfield, Valleyfield, QC, Canada
A novel propellant technology requires extruding two formulations with differential burning rates together as a multilayered propellant. This propellant is processed into a concentric cylinder configuration, in the form of slow-fast-slow with single perforation. The material uses different path lengths between the inner and outer sections of the die, both coming from the same pressure driven ...
Florida Institute of Technology, Melbourne, FL, USA
Developers of numerical models who address the title problem face several hurdles, such as: (1), the need to formulate boundary conditions applicable in an unbounded region; (2), The need to specify conditions suitable to ensure a unique solution in a doubly connected region; and (3), The need to allow the interior boundary to have a sharp edge, such as a cusp. The aim of the work reported ...
I. Lupelli, P. Gaudio, A. Malizia, R. Quaranta
Department of Industrial Engineering, University of Rome “Tor Vergata”, Roma, Italy
In this contribution we present the results of the numerical modeling and performance optimization study of a diaphragm pump for drug infusion. The main objective is to develop a numerical model that replicates the pumping cycle (400ms) and also provides indications about the variation of pumping performance as consequence of the variation of the chamber-diaphragm system geometry, diaphragm ...
CEA Valduc, France
During the welding of tantalum with a ND: YAG pulsed laser, a deep and narrow cavity, called the keyhole, is formed. At the end of the process, surface tension forces provoke the collapse of the keyhole. For important interface deformations, gas bubbles can be trapped into the melting pool. If the solidification time is insufficient, these bubbles give birth to residual porosities. The aim of ...
Institut de recherche d'Hydro-Québec, Shawinigan, QC, Canada
This work presents the results of a 3D numerical magneto-hydrodynamic (MHD) simulation of an electromagnetic DC pump for liquid metal using a rectangular metal flow channel subjected to an externally imposed transversal inhomogeneous magnetic field. In this study. 3D numerical simulation based on the finite element method was carried out using the computer package COMSOL Multiphysics 3.5a. The ...
D. Song, R. Gupta, and Chhabra
West Virginia University, Morgantown, West Virginia, USA
Indian Institute of Technology, Kanpur, India
Heat transfer from a sphere having a uniform temperature and falling axially in a cylindrical tube filled with an incompressible power-law liquid is numerically investigated. The governing equations for simultaneous flow around a confined sphere and heat transfer to power-law fluids were solved numerically using COMSOL Multiphysics. It was found that the wall effects on the mean Nusselt number ...
Department of Chemical Engineering, University of Washington, Seattle, Washington, USA
Mixing is characterized in liquids moving between bubbles when the bubbles are moving down a microfluidic channel. The shape is assumed based on fluid mechanical arguments and experimental observations, and the mixing is characterized for a variety of situations in two and three-dimensions. In COMSOL Multiphysics, an integration coupling variable was used by solving the problem in two dimensions ...
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 ...