And this is basically how you can make experimental #fluiddynamics measurements such as #ParticleImageVelocimetry #PIV in fixed bed reactors used, e.g., as heterogenous catalytic reactors in the chemical industry.

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RT @TheSpaceGal
Using the refractive index to make pennies float 🪄

Impt safety note: dry water beads grow 100x their size (to what you see here), so be extra vigilant with the dry beads before they’ve grown around kids…
https://twitter.com/TheSpaceGal/status/1630628058519719937

A so-called cross-correlation for two consecutive images will give you the direction and value of the flow velocity in the recorded flow field.

Here's an example where I recorded the water movement surrounding a bubble rising through the field of view
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RT @drlutzboehm
So, I told you about the #bubble and #CFD (see 🧵). A couple of years later I used the LASER-based technique #ParticleImageVelocimetry #PIV to investigate the flow…
https://twitter.com/DrLutzBoehm/status/1454076234619629574

How does experimental #fluiddynamics work?

You put particles in a fluid, here water in a stirred tank. For Particle Image Velocimetry #PIV you use a lens to create a laser sheet that illuminates the particles. Then you record the movement of the illuminated particles.

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This is a problem if you use the #laser based #fluiddynamics measurement technique #PIV in multiphase system. The laser light can be reflected from the #bubble surface and be redirected into your camera which can cause damage.

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https://twitter.com/DrLutzBoehm/status/1454076234619629574?t=xT1HR5iE8w3We5Zy8CY63A&s=19

Two draft #NIST Special Publications related to #PIV #authentication and #federation were released today: SP 800-157r1 and SP 800-217. Details at https://csrc.nist.gov/News/2023/nist-releases-two-draft-guidelines-on-piv #identity

Why do always the others have the good ideas for #fluiddynamic research topics.

This could have been me using our Particle Image Velocimetry #PIV for the good cause.

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https://twitter.com/Dlf_Forschung/status/1600872545108262913?s=20&t=v31SRBLfAgW4vQ1XwlPkCw

Tuesday, 4:45pm
Markus Kolano

406d Application of a Combined #PIV/#PTV-Method to Analyze #Suspensions in (non-)Newtonian Media in Stirred Tanks

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https://plan.core-apps.com/aiche2022/event/d98cb6e1bdac50c945a447aee4fbf841