This lesson covers the differential form of the momentum equations and the shear stresses acting on a fluid element in Cartesian, cylindrical, and spherical coordinates. It also discusses the initial and boundary conditions for viscous fluid flow. The lesson further explains the governing equations for laminar viscous fluid flows, including the continuity equation and the Navier-Stoke equation. It also elaborates on the Cauchy stress tensor, the second order stress tensor, and the deviatory stress tensor. The lesson concludes with a detailed explanation of the stress components in terms of the velocity gradient and the expression of the convective term in differential form.

- The differential form of the momentum equations and shear stresses are crucial in understanding fluid dynamics.
- The governing equations for laminar viscous fluid flows include the continuity equation and the Navier-Stoke equation.
- The Cauchy stress tensor, the second order stress tensor, and the deviatory stress tensor play significant roles in fluid dynamics.
- The stress components can be expressed in terms of the velocity gradient.
- The convective term can be expressed in differential form, which is essential in understanding the non-linear aspects of fluid dynamics.

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