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rotational flow

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rotational flow [rō′tā·shən·əl ′flō]
(fluid mechanics)
Flow of a fluid in which the curl of the fluid velocity is not zero, so that each minute particle of fluid rotates about its own axis. Also known as rotational motion.


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The flow parameter has values between rotational flow where [lambda] = -1, simple shear where [lambda] = 0, and planar extensional flow where [lambda] = 1.
The rheometer uses sliding-plate geometry, eliminating the instabilities associated with rotational flows.
The flow number describes the extensional and rotational flow components in the flow field; values ranging from [lambda] = 0 for pure rotational flow to [lambda] = 1 for pure extensional flow can occur here.
 
 
 
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