K. Stein, N. Gessner, R. Peterson, A. Wiedmann
Department of Physics, Bethel University, St. Paul, MN, USA
Undergraduate studies are carried out to examine the supersonic flow from an axisymmetric converging-diverging nozzle. Flow in the nozzle is initiated by the rupture of a diaphragm that is positioned between the nozzle and a 1-gallon pressurized air tank. Simulations are carried out in COMSOL Multiphysics® for unsteady, axisymmetric flow with the High Mach Number interface of the CFD Module. ...
Numerical Study of the Controlled Droplet Breakup by Static Electric Fields inside a Microfluidic Flow-focusing Device
Y. Li, K. Nandakumar, M. Jain
Louisiana State Univeristy, Baton Rouge, LA, USA
Conventional passive microfluidic flow-focusing devices confront difficulties in controlling droplet sizes in dripping regime especially when the dispersed phase has a large viscosity. It is reported that external electric field can be used to manipulate the droplet breakup. In the present study, a computational fluid dynamics based level-set method coupled with perfect dielectric model has been ...
J. Smeulers, N. Gonzalez Diez
TNO, Delft, The Netherlands
Turbo compressors can generate high frequency tonal noise, causing nuisance in the environment. As the noise is radiated from the piping, a silencer is installed between the compressor and the pipe system. Commonly an absorption silencer is applied, which is a vessel that contains acoustic absorption material. Due to high flow velocities and vibrations the absorption material may be blown out of ...
University of Napoli
The objective of this paper is to present the results of a numerical study undertaken to investigate the hydrodynamics and turbulent transport and mixing inside two contact tanks, which have the same channels but different location of the baffles. Transient concentration data were used to derive the residence time distribution (RTD) function for both tanks in order to evaluate and compare ...
E. Mogilevskiy, R. Ferrer, L. Gaffney, C. Granados, M. Huyse, Yu. Kudryavtsev, S. Raeder, P. Van Duppen
KU Leuven, Instituut voor Kern- en Stralingsfysica, Leuven, Belgium
De Laval nozzles are used in supersonic aerodynamical tubes and engines. They are also employed for the production of cold gas jets to be used in chemical reactions studies. Recently, cold gas jets have been proposed of In-Gas Laser ionization Spectroscopy (IGLIS) The nozzle has a converging and a diverging part with a throat between them. High gas pressure and temperature, and low velocity are ...
K. O. Lund
Engineering Consultant to SML Associates, Del Mar, CA, USA
Viscous equations are developed for regions with two interacting flowing fluids, or two fluid phases, such as occur in fluidized particle beds or the mixing of fluids. The descriptive equations are rendered into the standard COMSOL PDE matrix form, and solved over typical two-dimensional regions, as time-dependent interacting laminar flows.The model geometry selected is that of a so-called ...
Ritsumeikan University, Shiga, Japan
The vertical axis wind turbine design depicted in (Fig.1) is widely considered a wind turbine of a wind power generation system because it can be easily miniaturized, it generates low noise, and it rotates regardless of wind direction. The vertical axis wind turbine has, however, low rotation performance when compared with that of a horizontal axis wind turbine. Therefore, we need to improve the ...
D. Conchouso, E. Al Rawashdeh, D. Castro, A. Arevalo, I.G. Foulds
King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
This document presents the Computational Fluid Dynamics (CFD) simulation of a commonly used Microfluidic Droplet Generator (MFDG) using the Laminar Two-Phase Flow, Phase Field method in COMSOL Multiphysics®. The paper discusses the effect of the channel’s geometry in droplet size at different flow rate ratios and total flow rates. We then propose a guide to best select a cross-sectional area ...
R. Spina, M. Spekowius, C. Hopmann
Dept. of Mechanics, Mathematics and Management (DMMM), Politecnico di Bari, Bari, Italy.
Institute of Plastics Processing (IKV), RWTH Aachen, Aachen, Germany.
The manufacturing of high quality injection molded parts requires a deep understanding of material properties, process parameters and product design. The behavior of a polymer during the injection molding process and the performance of the final part are strongly determined by the material structure formed during filling and cooling. The main objective of the presented work is to describe the ...
H. Garg, A. K. Lall, Nidhi, V. S. Negi
Central Scientific Instruments Organisation, Chandigarh, India
PEC University of Technology, Chandigarh, India
UIET, Punjab University, Chandigarh, India
Microchannel heat sinks designed for applications in electronic cooling and having microscale heat transfer combine the attributes of high material compatibility, high surface area per unit volume ratios, and large potential heat transfer performance with a highly sophisticated and economic fabrication process. The present study deals with different microchannel shapes and different properties of ...