English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The frictional force and torque excerted by a fluid on a solid body which performs a slow translational or rotational motion is related to the rate of entropy production. Starting from the Navier-Stokes equation, a variational principle is derived for this quantity. Provided that the antisymmetric part of the viscosity tensor is smaller than its symmetric part upper and lower bounds on the force and torque are established. These bounds can be calculated with certain trial functions for the flow velocity field

zeitschrift für naturforschung a

Variational Principle for Slow Viscous Flow of Fluids with Anisotropic and Spatially Inhomogeneous Viscosity, Upper and Lower Bounds on the Frictional Force and Torque