Two-phase-flow Performance of a Centrifugal Pump in the Second, Third, and Fourth Quadrants PDF Download
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Author: Paul Louis Limburg
Publisher:
ISBN:
Category : Centrifugal pumps
Languages : en
Pages : 182
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Author: Paul Louis Limburg
Publisher:
ISBN:
Category : Centrifugal pumps
Languages : en
Pages : 182
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Author: Charles Courtney Snell
Publisher:
ISBN:
Category : Centrifugal pumps
Languages : en
Pages : 206
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Author: Karnig Ekizian
Publisher:
ISBN:
Category : Centrifugal pumps
Languages : en
Pages : 152
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Book Description
This study investigates the performance of a 1-inch long 4-vane open impeller centrifugal pump under two phase flow conditions. The paddle wheel pump, as branded by its manufacturer the Worthington Corporation, had a specific speed of 3400 (based on gallons per minute, feet of water and revolutions per minute) corresponding to a 7-inch impeller diameter. A 1/8-inch perforated steel pipe carried the compressed air to within four inches of the impeller eye where the air was injected into the water stream (See figures 18 and 20). The three variable inputs were, water flow rate, pump speed and air flow rate. The output parameters measured were discharge, suction pressure, and torque. While measuring the outing parameters, various combinations of the input variables were employed in order to find the maximum air-water volumetric ratio at which water flow stopped and the discharge head dropped to zero. At the pump speeds and air flow rates ranging from 1500 PPM to 3500 PPM and from 1.72 x 10−3 cubic feet/second to 2.65x10−3 cubic feet/second respectively, it was found that increasing the water flow rate from zero capacity to a certain limit resulted in an increase of the discharge head (See figure 1 to 5). This limiting capacity varied from 40 to 60 per cent of the pump's design capacity (35 GPM at 3500 RPM and 220 feet of water). A further increase of the water flow rate beyond the limiting capacity resulted in a quick drop of the discharge head. This characteristic behavior of the head-capacity curve was particularly noticeable at the higher air flow rates which ranged from 1.72x10−3 cubic feet/second to 2.65 x 10−3 cubic feet/second. It was also observed that at a given pump speed, increasing the volumetric air flow rate caused the head-capacity curve to peak at a lower discharge pressure. Finally, increasing the air content caused a shift in the efficiency curves such that peaked at a lower efficiency value as well as a lower flow capacity.
Author: Eugene Andras Chisely
Publisher:
ISBN:
Category : Centrifugal pumps
Languages : en
Pages : 480
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Author: Charles Courtney Snell
Publisher:
ISBN:
Category : Centrifugal pumps
Languages : en
Pages : 118
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Author: Zuchao Zhu
Publisher: Springer
ISBN: 9789819918218
Category : Science
Languages : en
Pages : 0
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Book Description
This book conducts a systematic study on internal flow characteristics and performance of centrifugal pump for solid–liquid mixed transportation. First, the applicability of the computational model for two-phase flow is analyzed. Then the relationship between the two-phase flow characteristics and wall wear in the pipeline is revealed. And the flow characteristics in centrifugal pumps are analyzed in relation to conveying performance and wall wear. Finally, the engineering application calculation of the mixed transportation pump with different impeller structures is carried out. The target audience of this book is researchers who perform calculations and engineering applications of solid–liquid two-phase pumps. This book considers the influence of the particle size on the force magnitude of the particles and analyzes the applicability of different solid–liquid two-phase calculation models. Considering the different motion trajectories of particles colliding with dry wall, wet wall, stationary wall, and moving wall, visual experiments are used to study the collision rebound model of different walls. The collision rebound model is applied to the numerical simulation of solid–liquid mixed transport.
Author: Raymond David Zegley
Publisher:
ISBN:
Category : Centrifugal pumps
Languages : en
Pages : 216
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Book Description
A pump system was built and instrumented on which tests were performed yielding single- and two-phase actual pump characteristics for first-quadrant operation (forward flow and forward rotation) of two different centrifugal impellers mounted in a simple two-dimensional volute. Theoretical single- and two-phase pump characteristics were determined from the impeller geometry, the Euler equation, and the use of the two-phase flow function. The head-loss ratio, the loss of head in two-phase flow dividied by the loss of head in single-phase flow, was then plotted versus void fraction. The results were compared to an earlier theory proposed which predicted the head-loss ratio to be primarily a function of void fraction. These results indicate that the head-loss ratio is a function of flow coefficient as well as void fraction. Flow-visualization studies were also conducted and revealed that flow regime inside the blade passages can be different from either the inlet or outlet flow regimes, and greatly affects pump performance. Further experimentation, on a more efficient system employing higher-specific-speed impellers, is recommended to study more closely the effect of flow coefficient, flow regime and void fraction upon two-phase pump performance.
Author: Mohamad Ladjevardian
Publisher:
ISBN:
Category : Centrifugal pumps
Languages : en
Pages : 88
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Author: C. Y. Paik
Publisher:
ISBN:
Category : Centrifugal pumps
Languages : en
Pages : 242
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Author: Alexander Perez Paran
Publisher:
ISBN:
Category :
Languages : en
Pages : 130
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Book Description
