Hydrodynamics of Pumps by Christopher E. Brennen

By Christopher E. Brennen

Hydrodynamics of Pumps is a reference for pump specialists and a textbook for complicated scholars exploring pumps and pump layout. This e-book is set the fluid dynamics of liquid turbomachines, really pumps. It specializes in particular difficulties and layout concerns linked to the move of liquid via a rotating laptop. There are features of a liquid that result in difficulties and reason a considerably various set of matters than these in fuel generators. those are the possibility of cavitation and the excessive density of beverages, which reinforces the potential of harmful, unsteady flows and forces. The ebook starts off with an creation to the topic, together with cavitation, unsteady flows, and turbomachinery in addition to easy pump layout and function rules. bankruptcy subject matters comprise stream positive factors, cavitation parameters and inception, bubble dynamics, cavitation results on pump functionality, and unsteady flows and vibration in pumps - mentioned within the 3 ultimate chapters. The booklet is richly illustrated and contains many sensible examples.

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At design flow, the wake or boundary layer on the suction surface may be quite thin, but as the flow coefficient, φ, is decreased, the increased incidence leads to larger wakes (Fischer and Thoma 1932, Johnston and Dean 1966). Clearly, the nonuniformity of the discharge flow implies an “effective” slip due to these viscous effects. This slip will not only depend on the geometry of the blades but will also be a function of the flow coefficient and the Reynolds number. The change with flow coefficient is particularly interesting.

7 Noncavitating Pump Performance It is useful at this point to develop an approximate and idealized evaluation of the hydraulic performance of a pump in the absence of cavitation. This will take the form of an analytical expression for the head rise (or ψ) as a function of the flow rate (or φ2 ). To simplify this analysis it is assumed that the flow is incompressible, axisymmetric and steady in the rotating framework of the impeller blades; that the blades are infinitely thin; and that viscous losses can be neglected.

We shall, however, provide an example of a radial equilibrium analysis since the results will prove useful in a later chapter. 1. We choose to examine one generic streamtube with an inlet radius, r1 , and thickness, dr1 . Both the position, n, and the thickness, dn, of the streamtube at discharge are not known a priori, and must be determined as a part of the solution. 3) where n is a coordinate measured normal to the streamlines at discharge and n = 0 at the hub so that r2 = RH 2 + n cos ϑ. 7.

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