In this study, a modified partially averaged Navier–Stokes (MPANS) model is applied to investigate the flow instability characteristics in a low specific centrifugal pump. In MPANS model, the unresolved-to-total ratio of kinetic energyfkis determined according to the local grid size and turbulenc...
The laser beam is reshaped into a 6-mm-thick slab of width ≈49 mm at the test section with a set of laser-grade cylindrical and spherical lenses. The height of the region of interest (ROI) is ≈35 mm and is defined by the aspect ratio of the CMOS sensor (width/height=8/5). ...
Meanwhile equation(17.44)is in a form where it may be integrated from initial conditions of speed and pump flow. The efficiency,ηP, used above may be found either from equation(17.33), if the function,fp3, is supplied, or else from the ratio of pumping power to demanded power (equations...
The method involves providing a calibrated output curve with a closed valve with a number of revolutions, and calculating coefficients from the curve for output against flow rate on a basis of a performance ratio of a pump. A performance equation for the flow rate is released at an actual ...
The in-plane SIV is dominated by the fundamental mode in the gas-liquid flow rate ratio range of 0.5–1.827. When increasing this flow rate ratio to 3.031, a travelling wave characteristic of the fundamental mode dominates the in-plane response (Zhu et al., 2019a). Three slugging flow ...
The paper proposes the full linearization of nonlinear characteristics of flow control valves via variable gear ratio design. The inherent nonlinear function of the normalized valve capacity coefficients to the percentages of valve opening is derived from flow experiments. In analysis, it is found that...
The use of existing large pumping station equipment for upstream residual water reverse power generation is an unrealized yet valuable renewable energy project. At present, some large axial flow pump stations have begun to perform reverse power generatio
Chapter 1: Continuity Equation Introduction Fluid flow is an important part of most industrial processes; especially those involving the transfer of heat. Frequently, when it is desired to remove heat from the point at which it is generated, some type of fluid is involved in the heat transfer ...
flow is made under the assumption that the shape of aggregated particles in the magnetic fluid is a rigidprolate spheroidas shown inFig. 7(Tsebers 1974). When the basic equations are simplified by the same procedure as forsteady flowin Sect.2.1, the following dimensionless equation is obtained...
In some cases, the mass flow rate (ṁ) is also used, which describes the mass through the pump over time. The volume flow rate is related to mass flow rate by the fluid density (ρ) via the equation: When selecting pumps, the flow rate or rated capacity of the pump must be ...