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排序方式: 共有143条查询结果,搜索用时 9 毫秒
111.
D. Carswell D. McBride T.N. Croft A.K. Slone M. Cross G. Foster 《Applied Mathematical Modelling》2013
This paper describes the development and application of a computational model based upon Computational Fluid Dynamics (CFD) software simulation technology to predict haemolysis in micro Left Ventricular Assist Devices (μLVAD). A CFD model, capturing the full three dimensional geometry of the device, together with an explicit representation of the rotating machinery based upon a rotating reference frame, is solved transiently. Mixed meshes with the order of a million elements are required to resolve the flow adequately and so to enable solutions in a reasonable time (e.g., 3 h) the model is solved on a high performance parallel cluster. Haemolysis is a measure of damage occurring in the blood and is conceived as accumulating as it passes through parts of the device where it encounters high shear forces. As such, the haemolysis model is based upon tracking the behaviour of particles released at the inlet throughout the flow domain and calculating the damage accumulated by each individual particle as it traverses the device. In order to ensure the model predictions of haemolysis are noise free from a statistically significant perspective then it is demonstrated that the number of particles to be tracked must exceed 20 000 in any simulation experiment. Comparisons with experimental data from a companion paper demonstrate the effectiveness of the CFD simulation embedding the haemolysis model. 相似文献
112.
David Winfield Nick Croft Mark Cross David Paddison 《Applied Mathematical Modelling》2013,37(16-17):7891-7904
A gravity dust-catcher separates a mixture of dusts from the spent top gas flow of a blast furnace. These dusts are predominantly made up of limestone, iron ore and coke/coal. As a result of the turbulent gas flow patterns within a dust-catcher, modelling of the flow pattern can be very complex, attributed to the turbulent vortices that can be formed within the main body of the structure. Using data from an experimental prototype test rig, a simple model to capture the lift-off characteristics of particle lift-off from dust pile surfaces is created and incorporated into a computational fluid dynamics (CFD) model of the dust-catcher.The variation of particle separation performance over a typical blast furnace (BF) operational cycle is analysed. An attempt is made to explain the observed phenomena in terms of particle–fluid interaction. It is found that particle separation efficiency is largely unaffected by dust lift-off at low dust-catcher hopper fullness levels, but is significant at higher levels. It is found that the topography of the dust surface is important when predicting particle lift-off trends. It is concluded that this is due to the exposure experienced by a given particle when subjected to a surface velocity. 相似文献
113.
M. Greenblatt W.H. McCarroll R. Neifeld M. Croft J.V. Waszczak 《Solid State Communications》1984,51(9):671-674
Four probe electrical resistivity measurements between 0.3K and 300K were made on single crystals of the violet-red bronze Li0.9Mo6O17 grown by a temperature gradient flux technique. The temperature variation of the resistivity shows metallic conductivity and highly anisotropic behavior similar to K0.9Mo6O17. The room temperature resistivity, measured in the direction parallel to the plate axis, is 9.5×10-3Ωcm and 2.47Ωcm perpendicular to that axis. A phase transition observed at ~24K is possibly related to the onset of a charge density wave. A transition to the superconducting state is observed at Tc ~ 1.9K. 相似文献
114.
Summary A metallic copper electrode is evaluated as a potentiometric detector for carboxylic acids. The application of this device
to ion-exchange chromatography is illustrated by the determination of oxalate in urine. Oxalate was selectively detected in
the presence of a 100-fold excess of sulphate after separation on a low-capacity methacrylate anion-exchange column using
0.7mM potassium hydrogen phthalate at pH 7.1 as eluent. Calibration plots were linear up to 50ppm of oxalate. Potentiometric
detection has also been applied to ion-exclusion chromatography using 0.005% phosphoric acid as eluent. With this method detection
limits of 0.2, 2.1, 5.0 and 5.3μg were obtained for formic, acetic, propionic and iso-butyric acids, respectively. 相似文献
115.
116.
The condensation of fluoroacetones with oxalyl fluoride in the presence of potassium fluoride has been shown to yield 2,2-di(fluoroalkyl)-5,5-difluoro-1,3-dioxolan-4-ones. 相似文献
117.
118.
The absolute configuration of the decipiene diterpenes has been determined by degradation to 4R-4-(2-methoxy-4-methylphenyl)-pentanoic acid. Photolysis of 1,18-diacetoxy-13-oxodecipi-14-ene proceeds through a novel photochemical reaction, formally a [2 + 2] cycloreversion, to generate a key intermediate for the degradation. 相似文献
119.
Ferro-Luzzi M Bouwhuis M Passchier E Zhou Z Alarcon R Anghinolfi M van Bommel R Botto T van den Brand JF Buchholz M Bulten HJ Choi S Comfort J Dolfini S Ent R Gaulard C Higinbotham D de Jager CW van Klaveren EP Konstantinov E Lang J de Lange DJ Miller MA Nikolenko D Nooren GJ Papadakis N Passchier I Poolman HR Popov SG Rachek I Ripani M Six E Steijger JJ Taiuti M Unal O Vodanis N de Vries H 《Physical review letters》1996,77(13):2630-2633
120.
Hansen AK Almagri AF Craig D Den Hartog DJ Hegna CC Prager SC Sarff JS 《Physical review letters》2000,85(16):3408-3411
A cause of observed anomalous plasma momentum transport in a reversed-field pinch is determined experimentally. Magnetohydrodynamic theory predicts that nonlinear interactions involving triplets of tearing modes produce internal torques that redistribute momentum. Evidence for the nonlinear torque is acquired by detecting the correlation of momentum redistribution with the mode triplets, with the elimination of one of the modes in the triplet, and with the external driving of one of the modes. 相似文献