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when we are solving a momentum transfer problem for a newtonian fluid we have two methods...

when we are solving a momentum transfer problem for a newtonian fluid we have two methods to solve :

1/ shell balance

2 / Navier Stokes equation

Q / when we are using Navier stokes equation. do we need continouity equations in order to solve the problem ? if yes please provide step by step method to solve the momentum transfer problem?

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