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278 views
00:12 Jan-19-2002
kauhmani
Need some interpretation of ultrasonic velocity in olive oil and water

Hello
I have made some measurements on ultrasonic velocity versus temperature in water and olive and sunflower oils. The temperature coeffecient is positif for water and negatif for oils.
Thank very much to give a physical interpretation of this behavior or some documentation on this topic.
Best regards


 
01:18 Jan-21-2002
elgazery
Re: Need some interpretation of ultrasonic velocity in olive oil and water Please
tell us how you measured and calculated the attenuation

: Hello
: I have made some measurements on ultrasonic velocity versus temperature in water and olive and sunflower oils. The temperature coeffecient is positif for water and negatif for oils.
: Thank very much to give a physical interpretation of this behavior or some documentation on this topic.
: Best regards
.



 
03:35 Jan-25-2002
Mike Leger
Re: Need some interpretation of ultrasonic velocity in olive oil and water : Hello
: I have made some measurements on ultrasonic velocity versus temperature in water and olive and sunflower oils. The temperature coeffecient is positif for water and negatif for oils.
: Thank very much to give a physical interpretation of this behavior or some documentation on this topic.
: Best regards
.
Velocity of water versus temperature is indeed positive from 0 deg C to 74 deg C, when it turns negative. The following equation relating ultrasonic velocity of fresh water to temperature may be found in Volume seven of the Nondestructive Testing Handbook, Second Edition:

V= 1410 + 4.21T - 0.037T(2) (T squared)
Where
V=fresh water ultrasonic velocity (m/s)
T=water temp (degrees C)

This formula seems to have a slight offset from empirical measurements I have made.
I have found the data in "Speed of sound in pure water as a function of temperature" by Nykolai Bilaniuk and George S.K. Wong, journal of the Acoustical society of America, Vol. 93, N0. 3 march 1993to match my measurements more closely.

I also would be interested in an explanation of the physics associated with the coefficient reversal.





 


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