Mecanica De Fluidos; Novena Edicion [Victor L. Streeter; E. Benjamin Wylie; Keith W. Bedford] on *FREE* shipping on qualifying offers. McGraw-Hill, – Mecánica de fluidos – pages Victor Lyle Streeter Snippet view – Bibliographic information. QR code for Mecánica de los fluidos. Download Citation on ResearchGate | Mecánica de fluidos / Victor L. Streeter, E. Benjamin Wylie | Traducción de: Fluid mechanics Incluye índice }.
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Open-channel flow at depth y is rapid when the flow velocity is greater than the speed 6 of an elementary wave in quiet liquid.
Streeter – Fluid Mechanics, 3rd
Discussion of a few cases will make this clear. Tranquil flow occurs when the flow velocity is less than fi. To satisfy both requirements, model and prototype have to be the same size.
It is important at gas-liquid or liquid-liquid inter- faces and also where these interfaces are in contact with a boundary. Arrange the following groups into dimensionless parameters: The Froude number is unimportant, but the Reynolds number effects called scale eflects because it is impossible to maintain t.
Hence, for strict dynamic similitude, the Mach, Reynolds, Froude, and Weber numbers must be the same in both model and prototype. Due to the moving parts in a hydraulic machine, an extra parameter is required to ensure that t.
Part b may also be expressed as a kinematic similitude; i. It is the most important correlating necanica when velocities are near or above local sonic streetdr. The various corresponding pressure coefficients are the same. By inspection, arrange the following groups into dimensionless parameters: Find the dimensions of the quantities in Prob. Model studies of proposed hydraulic structures and machines are frequently undertaken as an aid to the designer.
For geometrically similar machines if the vector diagrams of velocity entering or leaving the moving parts are similar, the units are homotogous; i. If accurate quantitative data are to be obtained from a model study there must be dynamic similitude between model and prototype.
They permit visual observation of the flow and make possible the obtaining of certain numerical data, e. Thc resistance to motion of a. It may also be shown to be a measure of the ratio of kinetic energy of the flow to internal energy of tho fluid.
Derive the unit of mass consistent with the units inches, minutes, tons. The remainder is stepped up to prototype size by Froude’s law, and the prototype skin friction fluido computed and added to yield total Eesistance due to the water.
This similitude requires a that there be exact geometric similitude, and b that the ratio of dynamic pressures at corresponding points be a constant.
For testing with fluids having the same kinematic viscosity in model and prototype, the product, V Dmust be the same. The Mach number ‘is also of importance in axial-flo w compressors and gas turbines. This parameter must relate the throughflow discharge to the speed of moving parts. Frequently this requires very high velocities in small models.
Mecánica de los fluidos – Victor L. Streeter, E. Benjamin Wylie – Google Books
Mecamica is a measure of the ratio of inertial forces to elastic forces. The difficulty is surmounted by using a small model and measuring the total drag on it when towed. Skin-friction studies should be based on equal Reynolds numbers in model and prototype, but wave resistance depends upon strreeter Froude number. The skin friction is then computed for the model and subtracted from the total drag. I t is useful in calculations of hydraulic jump, in design of hydraulic structures, and in ship design.
Surface tension causes small capillary waves and droplet formation and has an effect on discharge of orifices and weirs at very small heads.
The speed of sound in a liquid is written dw, if K is the bulk modulus of elasticity Secs.
Geometric similitude extends to the ,ecanica surface roughness of model and prototype. Fortunately, in many situa- tions only two of the forces are of the same magnitude. In steady flow in a pipe viscous and inertial forces fluixos the only ones of consequence; hence, when geometric similitude is observed, the same Reynolds number in model and prototype provides dynamic similitude.
In terms of M, L, T, determine the dimensions of radians, angular velocity, pon.
The particular value depends upon the situation. In compressible flow, the Mach number is generally more significant than the Reynolds number.