Topic
Impeller
About: Impeller is a research topic. Over the lifetime, 45119 publications have been published within this topic receiving 242579 citations. The topic is also known as: Impeller, impellar & blades.
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TL;DR: In this paper, a radial impeller-vaneless diffuser free-spool system was used to investigate turbocharger surge in the presence of a volute at the inducer tip, and two very different compression systems were employed to examine stall initiation phenomena as well as the behavior of the compressor characteristics when operating in surge.
Abstract: Turbocharger surge has been investigated in a radial impeller-vaneless diffuser free-spool system. Several different aspects are addressed. First, two very different compression systems, one with a large downstram volume and one with the smallest possible downstram voluem, are employed to examine stall initiation phenomena as well as the behavior of the compressor characteristics when operating in surge. The measurements show impeller stall at the inducer tips to be a key phenomena in initiating surge. The inducer stall is stationary and asymmetric, due to the presence of the volute, and is most severe near the volute tongue angular position
230 citations
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TL;DR: In this article, the authors compared the performance of tracer, tracer and multilevel slug tests on a test aquifer and found that the tracer data were the most convenient to obtain and tracer was the most difficult.
Abstract: A knowledge of the variation of horizontal hydraulic conductivity with vertical position, K(z), is important in understanding the transport and dispersive properties of aquifers. Using an impeller meter to measure the discharge distribution in a screened well while pumping at a constant rate is a promising technique for obtaining the K(z) function. Such an application is described herein, and the resulting K(z) functions are compared with those obtained previously using tracer tests and multilevel slug tests. Impeller meter data were the most convenient to obtain, and tracer data the most difficult. The K(z) functions obtained by the three methods were not identical but quite similar overall. This similarity between both borehole tests and the larger-scale tracer test showed that nonstationary hydraulic conductivity trends, in a stochastic hydrologic sense, exist in the test aquifer. The impeller meter method was better able to detect the higher K layers than was the multilevel slug approach. Overall, the results suggest that a practical strategy for “fitting” impeller meter, tracer, or multilevel slug test data to a given aquifer is to use the selected testing procedure to obtain a dimensionless distribution and then a standard pumping test to measure . Combining both types of information enables dimensional values for K(z) to be calculated. In low permeability aquifers or near the bottom of a test well the fluid velocity due to pumping may be below the stall velocity of an impeller. Thus there is a definite need for the commercial development of more sensitive flow-measuring devices such as heat pulse flowmeters (Hess, 1986), which will extend the resolution of this field method.
226 citations
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TL;DR: In this paper, a rigorous theoretical analysis is used to show that for both Newtonian and non-Newtonian power law fluids agitated in stirred vessels, the average shear rate γ in the fluid is a function of the rotational speed N of the impeller.
224 citations
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TL;DR: In this paper, the metallurgical performance of a 2.8m 3 portable industrial scale flotation cell was measured when treating zinc cleaner feed at Hellyer concentrator in Tasmania, Australia.
223 citations
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TL;DR: In this paper, the hydrodynamic, heat and mass transfer characteristics of mechanically agitated contactors have been critically reviewed and the mixing time (θmix) can be correlated well by a model based on circulation path and average circulation velocity.
222 citations