Maximum suction lift of water jet pumps

Abstract

This paper describes an experimental study on water jet pumps with different diameters and nozzle-to-throat area ratios. The results revealed that the area ratio was an important parameter to characterize the maximum suction lift of the jet pumps, while their diameters had a negligible effect. All jet pumps reached the cavitation regime at a suction lift of about 8 mH 2 O. In the non-cavitating region, it was found that the higher the area ratio, the higher the maximum suction lift for the same motive pressure head. However, the lower the area ratio, the higher the resistance to enter the cavitation regime. A dimensionless correlation was obtained for the non-cavitating region to describe the maximum suction lift as a function of a modified Thoma number and the area ratio. Curve fitting of experimental data also provided a dimensionless correlation to predict the onset of cavitation. Finally, applications of the results are presented.

Numerical studies for effect of geometrical parameters on water jet pump performance via entropy generation analysis

“…The main features of the jet pump are simplicity, reliability, durability, relatively low cost, and absence of moving parts. However, it has relatively low efficiency caused by irreversibilities, e.g., friction, jet flow, fluid stream mixing, recirculation, and pressure recovery [1,2]. Irreversibilities are not able to be eliminated, but it is possible to be controlled by appropriate combination operating conditions and geometry design [3].…”

An experimental study of the effect of the projection ratio and throat-aspect ratio on the efficiency and loss coefficient of a water jet pump

“…A typical jet pump is mainly composed of a nozzle, a suction chamber, a throat pipe, and a diffuser (see Figure 1(a)). The main features of the jet pump are the absence of rotating parts, simple structure, reliability, durability, and relatively low cost [1]. A good design of jet pump should have 20% to 40% efficiency [2].…”

Flow and Oxygen-Transfer Characteristics in an Aeration System Using an Annular Nozzle Ejector

“…Ejectors are being used as gas–liquid dispersion devices for many purposes in many industries, since they have high mass-transfer and mixing rates. , Many reports have researched the gas–liquid flow and mixing in ejectors, but the results are different and have individual scope of application due to the different ejector geometries, study methods, and species of fluids . The effects of different operating conditions such as nozzle velocity, pressure drop, and ejector geometry parameters on the performance of ejectors have been experimentally investigated by several researchers. − Mass-transfer and hydrodynamic characteristics of ejectors using air or water as the primary fluid or the entrained fluid have been investigated by Balamurugan et al, Kim et al, Mandal et al, Cramers and Beenackers, and Havelka et al…”

“…There are two configurations of ejectors as shown in Figure . The first is the conventional central-driven ejector, in which the primary fluid passes through the inner nozzle inside the ejector and the suction fluid passes through the annular periphery surrounding the nozzle. − Lima Neto et al and Baylar and Ozkan investigated the behavior of horizontal gas–liquid injection using a venture nozzle in a water tank as this study. Gas–liquid mass transfer in a pumped circulation loop reactor using a venture-type sparger was investigated by Fadavi and Chisti .…”