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I don't understand the meaning of equation

[tex]\int\dot{s}_{ij}\frac{\partial v_{j}}{\partial x_{i}}[/tex] dV

where [tex]\dot{s}[/tex] is rate of change of stress, [tex]v_{j}[/tex] is velocity.

Can anybody describe the meaning of this equation? Thank you.

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# Rate of stress versus velocity gradient

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