# Explain the importance of the Reynolds transport theorem

## Problem 6P Chapter 6

Fluid Mechanics | 2nd Edition

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Problem 6P Problem 6P

Explain the importance of the Reynolds transport theorem in fluid mechanics, and describe how the linear momentum equation is obtained from it.

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Solution  6P

Most principles of fluid mechanics are adopted from solid mechanics, where the physical laws dealing with the time rates of change of extensive properties are expressed for systems. In fluid mechanics, it is usually more convenient to work with control volumes, and thus there is a need to relate the changes in a control volume to the changes in a system.

The relationship between the time rates of change of an extensive property for a system and for a control volume is expressed by the Reynolds transport theorem, which provides the link between the system and control volume approaches which is why Reynolds transport theorem is very important in understanding of fluid mechanics.

The Reynolds transport theorem also known as the system to-control-volumetransformation for a fixed control volume is as below.

= +

The...

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