Results 261 to 270 of about 109,720 (300)
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Flow visualization and the three-dimensional flow in an axial-flow pump
Journal of Propulsion and Power, 1996Surface flow visualization on an axial-flow pump results in patterns of the skin-friction lines on various surfaces and these patterns provide important insight into the topology of the three-dimensional flowfield. In particular, critical points and lines within the patterns give characteristics of three-dimensi onal separation and the formation of ...
W. C. Zierke, W. A. Straka
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A Study of the Theory of Axial-Flow Pumps
Journal of Fluids Engineering, 1945Abstract The essential aim of this paper is to present the theory of axial-flow pump runners in as simple a form as possible. The results are fairly conclusive in so far as the determination of the flow conditions in individual cylindrical stream surfaces is considered. In addition, it has been found possible to eliminate the controversy
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Modeling of Recirculation in Axial Flow Pumps
1992The object of this paper is to qualitatively point out the critical flow rate corresponding to recirculation in the axial pumps. This situation is reached when the global flow rate of the machine decreases from the nominal value Qm to a first critical value Qk corresponding to the cancellation of the flow rate at the hub.
R. Noguera +3 more
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An Experimental Investigation of the Flow Through an Axial-Flow Pump
Journal of Fluids Engineering, 1995The high Reynolds number pump (HIREP) facility at ARL Penn State has been used to perform a low-speed, large-scale experiment of the incompressible flow of water through a two-blade-row turbomachine. The objectives of this experiment were to provide a database for comparison with three-dimensional, turbulent flow computations, to evaluate engineering ...
W. C. Zierke, W. A. Straka, P. D. Taylor
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Flow Visualization in the Outflow Cannula of an Axial Blood Pump
Bio-Medical Materials and Engineering, 2014The properties of blood flow in the outflow cannula of an axial blood pump play a critical role in potential thrombus formation and vascular injury. In this study, an in vitro flow visualization technique using particle image velocimetry (PIV) was applied to investigate the flow characteristics in the outflow cannula of a FW-2 model axial pump. The two-
Guangmao, Liu +5 more
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Design and simulation of axial piston pump with constant flow
IEEE 10th International Conference on Industrial Informatics, 2012There are flow pulsation in all existing piston pump, but this paper suggest a new constant flow method, and a axial piston pump with no flow pulsation in theory is designed. With the simulation in AMESim and MATLAB software, the dynamic characteristics of the new pump include pressure and flow are analyzed.
Jun Yin +3 more
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NPSHr Optimization of Axial-Flow Pumps
Journal of Fluids Engineering, 2008The two-step method for optimizing net positive suction head required (NPSHr) of axial-flow pumps is proposed in this paper. First, the NPSHr at the impeller tip is optimized with impeller diameter based on experimental data of 2D cascades in available wind tunnels.
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Numerical study on the impeller of an axial flow blood pump
2011 4th International Conference on Biomedical Engineering and Informatics (BMEI), 2011Continuous flow rotary blood pumps have been developed for decades due to the limited heart donors. Both axial and centrifugal flow types have been developed. In this study, an axial flow blood pump is studied, and the main focus is on the impeller optimization. Totally, nine impeller designs have been studied.
Leok Poh Chua, Boyang Su
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An Approach to Reducing Hemolysis in an Axial-Flow Blood Pump
ASAIO Journal, 1995In an attempt to decrease hemolysis caused by an axial-flow blood pump, we studied whether specific speed (Ns) at a design point (determined by flow in m3/min, pump head in m, and pump speeds in rpm), should be kept within the existing engineering standard range (1000 < Ns < 2500) or whether pump speed should be reduced to a minimum (Ns < 1000).
Hirofumi Anai +10 more
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On a new axial flow molecular pump
Journal of Scientific Instruments, 1965The theory of highly rarefied cascade flow has been presented and a proposal for a new axial flow (or radial flow) molecular pump (or compressor) in the free-molecule range has been made. An unconventional cascade has been suggested which will produce an extremely high compression ratio (up to 30 000) in a single stage at very high blade speed (S = Vc/(
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