k-Wave

1. peter kellythorn
   

   Member
   Joined: Nov '11
   Posts: 5

   Hi,
   I'm hoping someone can help me. I am new to matlab and K wave, I am looking into the possibliity of using a ultra sound device to measure the length of water droplets and the time taken for them to detach in the context of a chaotic dripping experiment. I have a 10mm diameter piezo disc at the top of a small head tank which has an nozzel in the bottom from which the water drips. I am trying to model how the ultra sound wave proogates through the water and into the droplet also how it reflects from the sides of the head tank so that I can optimise the tank design. Is this possible to do in K wave?
   Like I say I'm pretty much a novice so any help would be greatly recieved.
   Thank you.
   Peter

   Posted 12 years ago #

2. bencox
   

   Developer
   Joined: Mar '10
   Posts: 285

   Hi Peter,

   If you are using single-frequency excitation then I would think that an acoustic finite-element model of your small tank might be better than using k-Wave (which is inherently a time domain model), as you only need one frequency and you can define the boundary conditions (the aluminium-water boundaries) accurately. If you want to model how the drop forms and detaches, ie. the change in the shape of the boundary between the water and the air at the nozzle, then I think you'll need a more elaborate CFD solver.

   At the moment k-Wave only models propagation in fluids. You could probably get an idea of how the waves propagate in the small tank by setting the sound speed and density maps to have the values for aluminium around the outside (ignoring shear waves) and for water in the middle, but the large difference in values may introduce some Gibbs-type errors (as k-Wave uses a Fourier method to calculate gradients). You can set time-varying sources, so the source could be modelled.

   Have a look through the examples to get an idea of the sort of thing that k-Wave can model.

   Ben

   Posted 12 years ago #

3. peter kellythorn
   

   Member
   Joined: Nov '11
   Posts: 5

   Hi Ben,
   Thank you for your post.I have looked at the examples at first glance it appears that if I can combine the reflection and defraction slit examples I may be able to produce something that resembles a cross section through the chamber to model the propagation in the chamber.
   Thank you,
   Peter

   Posted 12 years ago #

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