|Oct25-10, 01:34 PM||#1|
¿Frequency of ultrasounds to obtain oil drops in water?
1. The problem statement, all variables and given/known data
To obtain microemulsions of oil into water ultrasounds are used. ¿What is the frequency to obtain oil drops of 1 microgram wich density is 0.995 g/cm3? (It does not need to be exact, with only the order of magnitude is sufficient).
2. Relevant equations
Well, I don't know if it is a diffraction problem, or If I should use resonance , or stationary waves.
I am lost at this point, I don't know wich physical principles rely behind this process of creating microemulsions.
3. The attempt at a solution
I am very sorry, but I don't understand the process.
Any idea to solve this will be well received.
I know that in physicsforums you should put the equations in the point 2, but I don't know what is the exact process.
Thanks in advance.
|Oct25-10, 06:12 PM||#2|
I have had an idea, I now what is the mass of the drops of oil, and the density so:
I suppose that the drops are spherical, so they have a volum of 4/3*pi*r^3.
Finally I use:
V=[tex]\lambda[/tex] / [tex]T[/tex]
Where V is the speed of sound under water.
[tex]\lambda[/tex] Is the wavelenght of the wave.
[tex]T[/tex] is the period, or the inverse of the frequency.
So, using V=1500 m/s and a size of 0.013 meters I obtain:
Frequency [tex]\approx[/tex] 115384.6 Herzs
So I suppose that the interference pattern of the emitted wave will create oil drops of the size of the wavelenght, logically it is an approximation, I only need to know the order of magnitude of the frequency.
¿Do you think that this is correct?.
|Oct26-10, 09:52 AM||#3|
I should give this to my teacher on wednesday, soy please ¿do you have any idea about this?.
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