Mini Pitot tube calibration using PIV

Yoav Kessler uses micro Pitot tube for the calibration of the new MEMS flow sensor in the MEMS Laboratory of Prof. Slava Krylov. We took a set of validation experiments using PIV and calibrated the Pitot tube in a jet from a Laskin nozzle aerosol seeding system. 

IMG_7810 (1)IMG_7798

 

Two-phase particle-laden turbulent flow in a 2D rocket engine model

first_frame_setup_movieSabrina Shlain studies the two-phase particle-laden turbulent flow in a 2D rocket engine. The main questions relate to the turbulence increase/decrease due to the inertial particles. The important parameter in this flow is the geometry of a rocket engine that adds specific features of a) acceleration of the flow into the nozzle, b) impact and restitution of inertial particles at high velocities and moving at large angles in respect to the streamlines of the flow. 

 

 

 

 

 

 

Bio-inspired navigation strategies in turbulent plumes

Figure-legends_W640Jointly with Roi Gurka, Ally Harari (Volcani Center)and Gregory Zilman we developed a concept of bio-inspired navigation in turbulent plumes. 

 

 

We performed numerical simulations and experiments in a wind tunnel with flying moths to study the dispersion of scalar plumes and moth navigation to a female. 

The-experimental-setup-of-the-open-loop-wind-tunnel-with-the-optical-access-dual-head_W640Recently Yiftach Golov joined our team and added collaboration with the group of Shlomo Margel (Bar Ilan) to add nano-materials research to the question of olfactory sensing and navigation of moths in turbulent environments. Yiftach also works on the moth tracking in 3D in Volcani Center wind tunnel w/o turbulence and various source competitions. 

 

A-sketch-of-a-series-of-discrete-puffs-and-the-trajectories-of-a-male-moth-view-from_W640

 

We also have Noam Benelli helping us to develop a numerical model of various navigation strategies using a unified Python platform for repeatable and fast simulations. 

Turbulent flows for the offshore macroalgae biorefinery

Our group collaborates with Dr. Alexander Golberg group from the Porter School of Environmental Studies on the marine biorefinery idea:  https://m.tau.ac.il/~agolberg/MBR.html 

 

Source: https://en-environment.tau.ac.il/MOBI_Workshop_2017_summary

Hadar Traugott studies hydrodynamic effects (pressure, hydromechanical shear stresses) on the macroalgae growth rates and chemical content. 

 

Meiron Zollmann focuses on the nutrients uptake and growth rates in the laboratory and natural offshore environments

 

Oz Habiby has been working on the pulsed light concept in our lab, growing algae in a hypothetical light/dark cycle using LED sun simulator. 

 

Wakes

Fluid flow wakes are the hydrodynamic signatures left by a moving body or carried by a fluid passing a body at some relative velocity. In dictionaries it is defined as “a trail of disturbed water or air left by the passage of a ship or aircraft”. Of course there are many other meanings of this word, but we focus here on only the fluid flows. More specifically our lab deals with turbulent wakes. 

A stratified wake of a hydrofoil accelerating from rest

 1-s2.0-S0894177715002769-gr1 1-s2.0-S0894177715002769-gr8

 

Vortex wake of a swimming knifefish 

An-example-of-an-instantaneous-PIV-image-with-velocity-vectors-overlaid-in-the-laboratory_W640Left-the-speed-of-the-knifefish-U-f-the-speed-of-the-vortices-U-w-the-width-of-the_W640

 

 

Wake behind a flapping free flying bird in a wind tunnel

 

journal.pone.0134582.g002 journal.pone.0134582.g006

 

If you want to get more details about these results, please read our papers here

 

Turbulent wakes of roughness elements in an urban canopy flow measured in Lagrangian framework in the environmental scale wind tunnel 

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Demitry Aronovsky

demitry

Demitry Aronovsky – lab engineer

Demitry Aronovsky is our lab engineer from Jan. 1, 2019. Demitry brings his vast experience from successful positions he took at industry. https://www.linkedin.com/in/demitry-aronovsky-10914957/