Okay, thank you very muchvanhees71 said:A very nice book on hydro is Landau and Lifshitz vol. 6.
Momentum in fluid mechanics is a measure of the quantity of motion of a fluid. It is the product of the mass and velocity of the fluid, and is a vector quantity with both magnitude and direction.
Momentum is calculated by multiplying the mass of the fluid by its velocity. In mathematical terms, it can be expressed as P = mv, where P is momentum, m is mass, and v is velocity.
The principle of conservation of momentum states that the total momentum of a closed system remains constant. In fluid mechanics, this means that the total momentum of a fluid in a closed system will remain constant unless acted upon by an external force.
Momentum plays a crucial role in determining the flow of fluids. It is responsible for the pressure and velocity changes in a fluid, and is a key factor in determining the direction and magnitude of fluid flow.
Momentum in fluid mechanics is essential in understanding and predicting the behavior of fluids in a wide range of applications, including aerodynamics, hydrodynamics, and fluid dynamics. It is also used in designing and optimizing various systems, such as pumps, turbines, and aircraft wings.