# Fluid Flow

May 7th, 2015
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If the velocity of the fluid is the same in magnitude and direction at every point in the fluid the flow is said to be uniform. A non-uniform flow is one where the velocities at different points at a given instant are not the same.

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Fluid FlowLecture No. 5CLASSIFICATION OF FLUID FLOW AND THE CONTINUITY EQUATION5.1 Classification of Fluid FlowUniform flowIf the velocity of the fluid is the same in magnitude and direction at every point in the fluid the flow is said to be uniform. Non-uniform flowA non-uniform flow is one where the velocities at different points at a given instant are not the same. Every fluid that flows near a solid boundary will be non-uniform because the fluid at the boundary takes the velocity of the boundary which is usually zero. Steady flowA steady flow is one in which the conditions (i.e., velocity, pressure, cross-section) may vary from point to point but do not change with time. Unsteady flowIf at any point in the fluid, the conditions change with time, the flow is unsteady. In reality, there are always slight variations in velocity and pressure; however, if the average values are constant, the flow may be considered steady. Steady uniform flowIn steady uniform flow, conditions do not change with position in the stream or with time.Example: Flow of water in a pipe of constant diameter at constant velocitySteady non-uniform flowIn this flow classification, conditions

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