viscous dissipation function

viscous dissipation function

[′vis·kəs ‚dis·ə′pā·shən ‚fəŋk·shən]
(fluid mechanics)
A quadratic function of spatial derivatives of components of fluid velocity which gives the rate at which mechanical energy is converted into heat in a viscous fluid per unit volume. Also known as dissipation function.
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The dimensionless viscous dissipation function [[Phi].