The behavior of bubbles confined in tubes and channels is important in medical and industrial applications. In these small spaces, traditional means of experimentally observing bubble dynamics are often impossible or significantly perturb the system. A laser Doppler vibrometer (LDV) requires a narrow (<1 mm diameter) line-of-sight access for the beam and illumination of the bubble does not pert...

Recent work has led to highly efficient physics-based computational models of wave propagation in strings, acoustic tubes, membranes, plates, and rooms using the digital waveguide filter, the 2-D digital waveguide mesh, and the 3-D tetrahedral digital waveguide mesh, all of which are suitable for real-time musical synthesis applications. A simple first-order nonlinear filter structure derived f...

Digital waveguide networks (DWNs) have recently been proposed as a means of simulating the time-evolution of various physical systems, especially within the context of musical sound synthesis [1, 2, 3, 4, 5]. In 1D, the technique has been applied to vibrations in acoustic tubes, and in strings; in this case, any uninterrupted stretch of air or string (uninterrupted by changes in tube crosssecti...

diesel exhaust particles are a complex mixture of thousands of gases and fine substances that contain more than 40 different environmental contaminants. being exposed to these exhaust particles (called soot) can cause lung damage and respiratory problems. diesel particulate filters are used in many countries for mobile sources as a legal obligation to decrease harmful effect of these fine parti...

Abstract. Labyrinth-shape quarter wavelength tubes are numerically studied under plane wave excitation, with analytical comparison. These labyrinth resonators (LRs) tuned at 60, 90 and 120 Hz, their sound absorption response exhibits maximum peak those frequencies high fidelity performance. objects can absorb tonal sources very low frequencies, an incredibly competitive thickness, resulting in ...

We study by numerical simulation in two and three dimensions the coupling layer between transducer microfluidic chip ultrasound acoustofluidic devices. The model includes with electrodes, a liquid-filled microchannel, chip. consider commonly used materials, solid epoxy glue viscous glycerol, as well device types, glass capillary tubes silicon-glass chips. how acoustic resonances ideal devices w...

Abstract Our previous study has revealed that acoustic resonances have non-negligible effects on photoacoustic signals for a liquid sample confined in thin tube. In this paper, we present numerical and experimental studies the of tube hardness directivity generated signal. A glass capillary silicone 1 mm diameter were tested using pulsed light 637 nm wavelength. Black ink was as material. capil...

Accurate modeling of the acoustic propagation in tubes varying cross section musical acoustics must include effects viscous and thermal boundary layers. Models viscothermal losses are classically written frequency domain. An approximate time-domain model is proposed which all physical parameters instrument, bore shape or wave celerity, explicit coefficients. The depends on absolute tabulated co...