Publication

Measurement of interfacial areas in gas-liquid dispersions by ultrasonic pulse transmission

Urs von Stockar
1985
Journal Articles

Abstract

An ultrasound pulse transmission technique was studied as an alternative means of measuring the specific interfacial area (a) in gas-liq. reactors. Characterization of gas-liq. dispersions using ultrasound can be a very valuable alternative in situations in which traditional techniques such as those based on optical principles cannot be applied. In order to calc. a from the measured pulse amplitude attenuation, sound scattering theory together with a correction procedure was applied. The ultrasonic pulse transmission measurement was used together with the classical light transmission method in order to measure specific interfacial areas of ?350 m-1 in a bubble column. The results of the 2 methods agreed well. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/75f58036-cd1a-4adb-9347-cfd242c536e2

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Urs von Stockar
1985
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/75f58036-cd1a-4adb-9347-cfd242c536e2

About this result

Related concepts (32)

Ultrasonic testing

Ultrasonic testing (UT) is a family of non-destructive testing techniques based on the propagation of ultrasonic waves in the object or material tested. In most common UT applications, very short ultrasonic pulse-waves with center frequencies ranging from 0.1-15 MHz, and occasionally up to 50 MHz, are transmitted into materials to detect internal flaws or to characterize materials. A common example is ultrasonic thickness measurement, which tests the thickness of the test object, for example, to monitor pipework corrosion.

Medical ultrasound

Medical ultrasound includes diagnostic techniques (mainly imaging techniques) using ultrasound, as well as therapeutic applications of ultrasound. In diagnosis, it is used to create an image of internal body structures such as tendons, muscles, joints, blood vessels, and internal organs, to measure some characteristics (e.g. distances and velocities) or to generate an informative audible sound. The usage of ultrasound to produce visual images for medicine is called medical ultrasonography or simply sonography, or echography.

Surface tension

Surface tension is the tendency of liquid surfaces at rest to shrink into the minimum surface area possible. Surface tension is what allows objects with a higher density than water such as razor blades and insects (e.g. water striders) to float on a water surface without becoming even partly submerged. At liquid–air interfaces, surface tension results from the greater attraction of liquid molecules to each other (due to cohesion) than to the molecules in the air (due to adhesion). There are two primary mechanisms in play.

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Measurement of interfacial areas in gas-liquid dispersions by ultrasonic pulse transmission

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