A n experimental investigation of a solid–liquid dispersion pipe flow was conducted using a pulsed ultrasonic Doppler velocimeter. The solid phase was composed of buoyant particles dispersed in water. This particular two-phase flow was used to mimic the behaviour of ice–water flow. Four diagnostics were used to study the complex nature of the two-phase flow mixtures: mean velocity profiles, spa...

A method is described for the measurement of basilar membrane (BM) vibration velocimeter (LDV). The instrumentation was coupled to a compound microscope which served to visualize reflective glass microbeads placed on the BM. The laser beam of the LDV was focused in the microscope object plane and positioned over the reflective bead. We show examples of frequency tuning curves and displacement i...

In this paper, we present a high accuracy laser range finder and velocimeter using ultra-fast time-to-digital converter (TDC). The system operation is based on the measuring the round-trip time of a narrow laser pulse. A low-dark current high-speed PIN photodiode is used to detect the triggered laser beam and to produce start signal. The pulsed laser diode generates 45W optical power at 30ns du...

The research of hypersonic process is limited by the transition model, turbulence and computational complexity. At present tunnel test still a better way to investigate than fluid dynamic (CFD) method. In this work, principle structure all-fiber photon Doppler velocimeter (PDV) are introduced. PDV based on laser effect consists an Mach Zehnder interferometer optical antenna. measurement accurac...

A physical model of gabion overflow dams was studied to determine the velocity profile and Reynolds shear stress. Physical tests were done under two different conditions of dam crest, overflow dams with impermeable and with permeable crests. Instantaneous velocity components over dam crest were measured by an ADV (Acoustic Doppler Velocimeter) instrument. This instrument is capable of measuring...

In the present study, enhancement of liftoff and blowout a propane/air coflowing diffusion flame by water mist was experimentally investigated in subsonic range. When fuel injection velocity U f is low, an attached laminar stabilized at burner rim with premixed base. An increase leads to flame, eventually lifted flame. The upstream disappears turbulent downstream region. stability deteriorates ...

In 10 cardiac patients in whom an organic lesion of the mitral valve was exluded by standard investigation procedures during which a diagnostic transseptal catheterization for pressure measurements in the left heart was performed, the authors placed a directional Doppler ultrasonic catheter tip velocimeter at the site of the mitral ring and recorded the mitral flow velocity traces. The pattern ...

Highly dense and ultra-hard Stishovite phase is the most stable form of SiO2. It formed when fused silica subjected to extreme pressures (>34 GPa). In this communication, we report nucleation in shock-loaded soda-lime glass (SLG) samples at a remarkably low compressive stress 7 GPa. Although it falls within reported Hugoniot Elastic Limit SLG between 2.5 GPa, significantly below crystallization...