scholarly journals Continuous Reaction Crystallization of Struvite in a DTM Type Crystallizer With Jet Pump of Ascending Suspension Flow in a Mixing Chamber–Kinetic Approach of the Process

2012 ◽  
Vol 02 (03) ◽  
pp. 96-104
Author(s):  
Agata Mazienczuk ◽  
Andrzej Matynia ◽  
Krzysztof Piotrowski ◽  
Boguslawa Wierzbowska
Keyword(s):  
Suspension Flow ◽  
Kinetic Approach ◽  
Jet Pump ◽  
Mixing Chamber ◽  
Continuous Reaction ◽  
Type Crystallizer

Numerical Simulation on Flow Structure of a Steam-Jet Pump Influenced by Primary Nozzle Geometries

2011 ◽  
Vol 130-134 ◽  
pp. 1703-1707 ◽  
Author(s):  
Xiao Chun Dai ◽  
Jian Huo
Keyword(s):  
Fluid Dynamics ◽  
Flow Structure ◽  
Mixing Process ◽  
Nozzle Outlet ◽  
Jet Pump ◽  
Entrainment Ratio ◽  
Great Loss ◽  
Mixing Chamber ◽  
Throat Diameter ◽  
Nozzle Geometries

The aim of the paper is to reveal the flow structure and the mixing process of a steam-jet pump by using a computational fluid dynamics code FLUENT. Discusses the effect on a steam-jet pump’s entrainment ratio when the throat diameter of the primary nozzle as well as the outlet diameter of the primary nozzle is varied. Analyzes the position of shock wave which will bring the steam-jet pump’s performance a great loss. The performances of a steam-jet pump are studied by changing back pressures while the distance between primary nozzle outlet and mixing chamber inlet (DPM) is varied. The entrainment ratios of a steam-jet pump with different values of DPM and different back pressures are calculated.

Experimental and numerical studies of the effect of area ratio and driving pressure on the performance of water and slurry jet pumps

2011 ◽  
Vol 226 (9) ◽  
pp. 2250-2266 ◽  
Author(s):  
Tarek Meakhail ◽  
Ibrahim Teaima
Keyword(s):  
Area Ratio ◽  
Driving Pressure ◽  
Operating Conditions ◽  
Jet Pump ◽  
Numerical Studies ◽  
Pumping Stations ◽  
Mixing Chamber ◽  
Jet Pumps ◽  
Different Diameters ◽  
Experimental Rig

The slurry jet pump with scouring nozzle system can be used in dredging of sites, which are difficult to access or need handling of equipments that are used for the intake of pumping stations under bridges and concrete water channels. This system is suitable for sand, silt, sludge, mud, and other organic materials. The aim of this study is to investigate the performance of water and slurry jet pumps. The effects of the pump-operating conditions and geometries on its performance were investigated. The experimental rig was constructed in such a way that the driving nozzle diameter can be changed. In this study, three different diameters of driving nozzles, 10, 12.7, and 16 mm, have been used with one mixing chamber of 25.4 mm diameter (i.e. three different area ratios of R = 0.155, 0.25, and 0.4). Also, the effect of driving pressure has been investigated. The results show that increasing the area ratio decreases the maximum mass flow ratio. The results of computational fluid dynamics were found to agree well with actual values obtained from the experimental water and slurry jet pump.

scholarly journals Reaction crystallization of struvite in a continuous DTM type crystallizer with a compressed air driven jet pump

2011 ◽  
Vol 13 (2) ◽  
pp. 46-53 ◽  
Author(s):  
Andrzej Matynia ◽  
Agata Mazieńczuk ◽  
Krzysztof Piotrowski ◽  
Bogusława Wierzbowska ◽  
Nina Hutnik ◽  
...  
Keyword(s):  
Residence Time ◽  
Mean Residence Time ◽  
Experimental Tests ◽  
Compressed Air ◽  
Linear Growth Rate ◽  
Process Conditions ◽  
Jet Pump ◽  
Working Volume ◽  
The Mean ◽  
Type Crystallizer

Reaction crystallization of struvite in a continuous DTM type crystallizer with a compressed air driven jet pump Experimental tests covering the production of struvite MgNH4PO4·6H2O from water solutions containing 1.0 mass % of phosphate(V) ions using magnesium and ammonium ions in stoichiometric proportions were carried out in a crystallizer of 1.2 dm3 working volume. The process temperature was 298 K. Struvite crystals of mean size Lm from ca. 14 to ca. 38 μm were produced depending on the process environment's pH (9-11) and the mean residence time of suspension in a crystallizer, τ (900-3600 s). In such defined process conditions the linear growth rate of struvite crystals changed from 1.45·10-8 m/s (pH 9, τ 900 s) to 2.06·10-9 m/s (pH 11, τ 3600 s) while the nucleation rate from 5.1·107 to 3.2·109 1/(sm3). Crystal product of the most advantageous granular characteristics was produced at pH 9 and the mean residence time 3600 s. Within this product population the largest sizes reached above 200 μm while the number of crystals smaller than 3 mm was kept below 6%.

Simulation of a downhole jet-vortex pump’s working process

Nafta-Gaz ◽  
2021 ◽  
Vol 77 (9) ◽  
pp. 579-586
Author(s):  
Denis Panevnyk ◽  
Keyword(s):  
Dynamic Pressure ◽  
Relative Displacement ◽  
Average Error ◽  
Oil Well ◽  
Jet Pump ◽  
Cross Sectional ◽  
Pressure Characteristic ◽  
System Pressure ◽  
Dynamic Head ◽  
Mixing Chamber

The article is devoted to the theoretical study of the operation process of the borehole ejection system as part of the tubing string, jet pump and packer installed below; the system implements the hydrojet method of oil well operation. The improved design of the jet pump contains inclined guiding elements placed in its receiving chamber for swirling the injected flow, which results in an increase in the efficiency of the borehole ejection system. Based on the law of conservation of liquid momentum in the mixing chamber of the jet pump and taking into account the inertial pressure component caused by the swirling of the injected flow, there is obtained the relative form of the equation of the ejection system pressure characteristic, the structure of which contains a component that determines the value of the additional dynamic head. According to the results obtained, the additional dynamic head caused by swirling of the injected flow is determined by the ratio of the geometric dimensions of the flow path of the jet pump, the angle of inclination of the elements for creating vortex flows, and the ratio of the power and reservoir fluids. In the case of asymmetric swirling of the injected flow, an increase in the value of the relative displacement of the jet pump decreases the value of the additional dynamic pressure. In order to study the effect of flow swirling on the energy characteristic of the ejection system, the pressure characteristic of the jet pump was transformed into the dependence of its efficiency on the injection coefficient. Jet pump models with the ratio of the cross-sectional areas of the mixing chamber and the nozzle of 5.012 and 6.464, respectively, were used to check the adequacy of the theoretical pressure and energy characteristics obtained during the simulation of the performance process of the concentric ejection system. The average error in the theoretical determination of the pressure and efficiency of the vortex jet does not exceed 8.65% and 6.48%, respectively.

scholarly journals Numerical Investigation of the Flow Field and Mass Transfer Characteristics in a Jet Slurry Pump

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 2053
Author(s):  
Yi’nan Qian ◽  
Yuanshun Wang ◽  
Zhenlong Fang ◽  
Xiuhan Chen ◽  
Sape A. Miedema
Keyword(s):  
Flow Field ◽  
Numerical Study ◽  
Pressure Ratio ◽  
Three Dimensional ◽  
Internal Flow ◽  
Axial Line ◽  
Suction Pressure ◽  
Flow Ratio ◽  
Jet Pump ◽  
Mixing Chamber

A jet pump is used to transport a variety of working media and is especially suitable for dredged soil transporting. In this study, a three-dimensional numerical study of a jet pump that is used for slurry delivery was carried out. The characteristics of the internal flow field of the mixing chamber with different working parameters were comprehensively analyzed. The results indicate that the pressure of the axial line decreases with increasing flow ratio (ratio of suction flux and inlet flux) while the pressure of the injected slurry shows a downward trend. With the increase in the flow ratio, the pressure ratio (difference between inlet pressure and suction pressure divided by the difference between exit pressure and suction pressure) falls off while the efficiency presents a parabolic distribution. The pressure ratio can be promoted by properly increasing the length of the mixing chamber so that the available efficiency is broadened. When the mixing chamber length is L = 2.5Dn~4.0Dn (Dn is nozzle outlet diameter), the highly efficient area is wide; in particular, when L = 3.5Dn, the jet slurry pump with the highest efficiency of 27.6% has the best performance.

scholarly journals STUDY ON CHARACTERISTICS OF A DOWNHOLE VORTEX JET PUMP

2021 ◽  
Vol 2(73) (2) ◽  
pp. 22-32
Author(s):  
Denis Panevnyk ◽  
Keyword(s):  
Swirling Flow ◽  
Dynamic Pressure ◽  
Relative Pressure ◽  
Technological Parameters ◽  
Jet Pump ◽  
Cross Sectional ◽  
Flow Rates ◽  
Relative Flow Rate ◽  
Mixing Chamber ◽  
Jet Pumps

This article analyzes the possibility of increasing the efficiency of using downhole jet pumps by swirling the injected flow. To analyze the peculiarities of the local swirling of injected flow, design and technological parameters in the form of the inclination angle of guiding elements, the diameter of the helical trajectory described by the fluid particles, and the flow rates of the swirling flow are studied. Based on the application of the conservation law of fluid momentum in adjacent jets with a parabolic pressure distribution, equations to determine the pressure characteristic of a jet pump are obtained, taking into account the additional dynamic pressure made by swirling the injected flow. In the process of analyzing the obtained relations, has been set the dependence of the relative pressure growth and the efficiency of the ejection system under the conditions of injected flow swirling on the relative flow rate of a jet pump, and an inversely proportional dependence of the above parameters on its main geometric parameter in the form of the ratio of cross-sectional areas of the mixing chamber and the nozzle.

XXVIII.—The Loss of Energy at Oblique Impact of Two Confined Streams of Water.

1913 ◽  
Vol 48 (4) ◽  
pp. 799-811 ◽  
Author(s):  
A. H. Gibson
Keyword(s):  
Centrifugal Pump ◽  
A Priori ◽  
Oblique Impact ◽  
Jet Pump ◽  
Mixing Chamber ◽  
Moving Body ◽  
Before And After ◽  
The Impact ◽  
Two Jets

When two jets or streams of water moving with equal or unequal velocities meet at an angle and combine to form one common stream, the impact is usually accompanied by loss of energy, which may be large if the velocities are high. If the jets are free (exposed to air on every side), the pressures are unaltered by impact, and the loss may be readily calculated in terms of the initial velocities and angle of inclination, by an application of the equations of energy and of momentum. Where the streams are confined before and after impact—as, for example, where the streams outflowing from the impeller of a centrifugal pump impinge on the more slowly moving body of water in the volute, or where the two streams combine in the mixing chamber of a jet pump or injector,—both pressures and velocities are altered by the impact, and the available data are insufficient to enable the magnitude of the losses to be predetermined from a priori reasoning.

scholarly journals Optimization of design and mode parameters of the well ejection system

2020 ◽  
pp. 73-80
Author(s):  
Ye. I. Kryzhanivskyy ◽  
D. O. Panevnyk
Keyword(s):  
Geometric Parameter ◽  
Energy Performance ◽  
Maximum Efficiency ◽  
Relative Pressure ◽  
Drilling Speed ◽  
Jet Pump ◽  
Mixing Chamber ◽  
Jet Pumps ◽  
Injection Ratio ◽  
Pressure Characteristics

Insufficient energy performance of ejection equipment and a high probability of non-operating modes of its operation reduce the efficiency of downhole jet pumps. The method of determining the design and operating parameters of the well ejection system, which provide the maximum efficiency of the jet pump, is presented.  The proposed algorithm for determining the optimal values of the geometric dimensions of the flowing part of the jet pump involves the construction of a series of pressure characteristics for different values of its geometric parameter, the calculation of the efficiency and the determination of the injection ratio and the relative pressure corresponding to its maximum values.  During the studies, the main geometric parameter of the jet pump varied in the range from 2 to 6, given that these geometric dimensions are used in jet devices common in the oil industry. The optimal dimensions of the current part of the jet pump are obtained in the process of studying its pressure characteristics, and the optimal dimensions of the washing system of the bit - in the process of studying the characteristics of the hydraulic system. The design of an at-bit ejection system, which allows to increase the mechanical drilling speed, the passage of the bit, to stabilize the moment on the bit, to reduce its level of vibration and to control the antiaircraft angles of the well is considered. The efficiency of using at-bit jet pumps is in the following: an increase in the mechanical drilling speed up to 18.7%, the passage of the bit up to 50.8%. The research established the optimal diameters of the working nozzle, mixing chamber and bit nozzles, the distance between the working nozzle and the mixing chamber, the injection ratio and the relative pressure of the at-bit jet pump. The obtained values ​​of design and mode parameters exclude the occurrence of cavitation modes of operation of the ejection system and allow the operation of jet pumps with maximum efficiency.

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