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Participant

Join Date: Oct 2017
Posts: 1

Nanofluid Velocity Map

10/24/2017 8:40 AM

Hello,
I am working with a nanofluid flowing trough a pipe. I would like to visualize a velocity vectorial map of the particles and I was wondering if using a doppler velocimeter this is possible. Alternatively, what do you suggest?
Thanks in advance,
Erik

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Pathfinder Tags: nanofluid doppler velocimeter
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Guru

Join Date: Apr 2010
Posts: 5760
Good Answers: 578
#1

Re: Nanofluid velocity map

10/24/2017 9:12 AM

Maybe if you mix in some micro glass beads with your liquid. These are used in reflective paint for road markings and road signs.

http://colesafety.com/Aluminized-Reflective-Glass-Bead-Microspheres-Aluminized-HI-Beads.htm

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Guru

Join Date: Oct 2008
Posts: 39916
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#3
In reply to #1

Re: Nanofluid velocity map

10/25/2017 4:33 PM

Depending on the fluid density, solid glass micro-spheres may float. Spheres are used in reflective paints.

Glass micro-balloons float in water. They are used as a filler to lower the density of the parent material.

This may not matter.

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Guru

Join Date: Apr 2010
Posts: 5760
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#2

Re: Nanofluid Velocity Map

10/24/2017 6:57 PM

Here is an interesting technique:

Schematic setup of a molecular tagging velocimetry experiment

https://en.wikipedia.org/wiki/Molecular_tagging_velocimetry

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Guru

Join Date: Apr 2010
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#4

Re: Nanofluid Velocity Map

10/25/2017 8:49 PM

Here are two methods:

Laser Doppler Velocimetry

A laser beam is separated into two beams which are steered to intersect at a point in the fluid at a slight angle. The interference pattern creates bright and dark planes. Variations of the reflection from a particle in the fluid can be interpreted as the velocity vector perpendicular to the interference planes.

https://www.erc.wisc.edu/ldv.php

Particle Image Velocimetry

Successive images of particles in the fluid can be analyzed with a computer. Tiny sections of the image are analyzed and the crosscorrelation (direction of change) indicates the velocity direction and magnitude at that point.

https://www.erc.wisc.edu/piv.php

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