The orienting action of ultrasound on liquid crystals related to the theorem of minimum entropy production

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Abstract
We show how the theorem of minimum entropy production of irreversible thermodynamics may be used to confirm the reality of the torque exerted on oriented liquid crystal molecules by an ultrasonic wave. This torque has previously been related to the anisotropy of acoustic attenuation. The analogy with the Langevin radiation pressure is underlined, and the possible existence of an ultrasonic‐type Frederiks transition is discussed.

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