CWR4202_Lecture_Packet_01

CWR4202_Lecture_Packet_01 - CWR 4202 Lecture Packet 1 What...

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CWR 4202 Lecture Packet 1 What is Hydraulics? A branch of Fluid Mechanics Hydrodynamics —the theoretical (mathematical) branch of fluid mechanics concerned with forces acting or exerted by fluids. Hydraulics —the branch of fluid mechanics concerned with the conveyance of liquids through closed conduit (pipes), channels, hydraulic structures, and hydraulic machines. Historically, this branch was more applied and empirically based. (Typically man made, “engineered” systems). Hydrology —The study of properties of earth’s water, it’s occurance, distribution, movement and balance on and below the earth’s surface and in the atmosphere. (Typically looking at natural systems, or interactions of man made impacts on natural systems). Transitioning from Theory to Application (Hydrodynamics to Hydraulics) The problems encountered early in Hydrodynamics (especially hydrostatics) involved only a small number of quantities, basically , g and y. In consequence, the equations developed were simple and precise. Thus, if the results of hydrostatic experimentation and calculation are compared, they are found to agree within the limits of experimental accuracy. Unfortunately, this combination of simplicity and accuracy does not apply when we turn our attention to problems involving fluid flows. “Real world” engineering flows are mostly very complex, and it is not usually possible to evolve precise theoretical models. However, a great deal can be learnt about flows by adopting the techniques and equations which were developed in hydrodynamics. These equations are
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