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In 1845, Stokes obtained a relation for the shear stress of Newtonian fluids. With some modification in
the viscosity terms, these equations are given as follows:
Asymmetric stress tensors are given as:
where m is the dynamics viscosity and l is the second viscosity coefficient, given by Stokes as:
(c) Energy Equation
The energy equation is based on the principle that energy is conserved. It is also called the First Law of
Thermodynamics. Its general form is given in Eqn (1.3):
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