Z. S. Gul, N. Xiang, M. Caliskan
Department of Architecture, Middle East Technical University, Ankara, Turkey
School of Architecture, Rensselaer Polytechnic Institute, Troy, NY, USA
Department of Mechanical Engineering, Middle East Technical University, Ankara, Turkey
Sound energy distribution patterns within enclosed spaces are the basic concerns of architectural acoustics. Energy decays are analyzed for major acoustical parameter estimations, while spatial energy distribution and flow vectors are indicative in the analysis of sound energy circulation and concentration zones. In this study the acoustical field of a real-size multi-domed monumental ...
R. R. Andrés , E. Riera ,
 Grupo de Sistemas y Tecnologías Ultrasónicas, ITEFI, CSIC, Madrid, España
There are several industrial applications, like food dehydration, atomization and textile washing among others, that are enhanced by the use of power ultrasonic transducers with flat rectangular plate radiator. These transducers are composed by three main parts, the piezoelectric Langevin type sandwich, the mechanical amplifier, and the extensive plate radiator. Apart from the general ...
K. Anderson, A. Smith, D. Forgette
Mechanical Engineering, California State Polytechnic University at Pomona, Nonlinear FEM/CFD Multiphysics Simulation Lab, Pomona, CA, USA
In this poster the acoustic analysis of a small home recording studio is presented.. Figure 1 illustrates the recording studio room which was simulated using the COMSOL Multiphysics® software with the Acoustics Module . The propagation of sound is modeled as pressure waves in which modal analysis is performed in the frequency domain . Lower eigen-frequencies are the most critical to ...
A. Arevalo , D. Castro , D. Conchouso , I. G. Foulds 
 Computer, Electrical and Mathematical Sciences and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Saudi Arabia
 The University of British Columbia, School of Engineering, Okanagan Campus, Saudi Arabia
For our simulation we used the Piezoelectric Devices interface. The structure was set with (clamped) fix constraint boundaries to both ends. The bottom electrode was set to be the ground for the electrostatic physics and the top electrode was set to be a Terminal with potential of 10V. A parametric sweep study was set to change the geometry, the parameters to change was the hole diameter (Holed) ...
F. J. Navarro-Brull , P. Poveda , J. Ramis , R. Gómez ,
 Departament de Química Física, Universidad de Alicante, Alicante, Spain
 Departament de Física, Enginyeria de Sistemes i Teoria del Senyal, Universidad de Alicante, Alicante, Spain
Possible drawbacks of microreactors are inefficient reactant mixing due to the predominance of laminar flow and clogging (when solid-forming reactions are performed or solid catalyst suspensions are used). Ultrasound has been successfully implemented not only to prevent these problems but also for its well-known mixing and particle-dispersion effects. Several configurations have been used for ...
Study & Modeling of 'Acoustic Matching Layers' for Ultrasound Imaging Probes Through Pulse-Echo FEM Simulation - new
Esaote SpA, Florence, Italy
Ultrasound Imaging probes are specific devices that require a very detailed design of acoustic impedance match for the stack of layers that form the probe head (1,3). These are typically made of silicone rubber, special epoxy resins, polyurethanes and, of course, piezoelectric materials. The acoustic impedance, measured in Rayls, have to be matched similarly to an electric circuit (2), from a ...
T. Kaufmann, F. Kassubek, D. Pape , M. Lenner
ABB Corporate Research, Baden-Dättwil, Switzerland
Lamb waves are elastic waves propagating in free solid plates. In the case of plates loaded with a fluid, the equations describing these waves have to be modified to include the effects of the fluid. In our work we have tackled this problem using COMSOL Multiphysics®. We have used the two-dimensional plane strain model of the solid mechanics interface to calculate the eigenmodes of the coupled ...
Y. Li, T.C. Lieuwen, J. Zhou, H. Cao
Zhengzhou University, Zhengzhou City, Henan Province, China
Georgia Institute of Technology, Atlanta, GA
One can hardly get the exact analytic solution of a full time-dependent convection-diffusion equation, for describing the dynamics of a non-premixed flamelet. The analytic solution of the linearized form with such a model was studied by MATLAB®. And also, a numerical computation was made with the linearization model in COMSOL Multiphysics® software, to provide a perfect accordance with the ...
P. Bonfiglio and F. Pompoli
Materiacustica S.r.l., Ferrara, Italy
Engineering Department, University of Ferrara, Ferrara, Italy
The present work deals with a numerical investigation of resonating systems used for noise control applications. In literature one can find analytical models based on fluiddynamics concepts for evaluating losses occurring across the holes of the perforates. In the paper an acoustical formulation based on the equivalent dissipative fluid approach will be analyzed. It will be firstly applied to ...
A. Salari, C. Dalton
Department of Electrical & Computer Engineering, University of Calgary, Calgary, AB, Canada
Flow focusing microchannels are widely used in droplet generation mechanisms. In this paper, the effect of linear vibration on the flow pattern in a flow focusing structure and the corresponding formed droplets were numerically investigated using COMSOL Multiphysics® software. The results showed that vibration can be very effective on droplet formation, if the governing parameters such as ...