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Computational Fluid Dynamics Analysis of shroud Design on Hemodynamic Performance and Blood Damage in a Centrifugal Blood Pump

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Computer Modeling in Engineering & Sciences 2018年第8期116卷 199-213页

作者： Guangliang Pan Yu Chang Mingrui Fu School of Life Science and BioEngineering Beijing University of TechnologyBeijing100124China.

Patients with extracorporeal membrane oxygenation still suffer from high rates of complication that linked to the flow field within the blood *** it is essential to optimise the geometry of the *** specification of shroud design is arguably the necessary design parameter in the centrifugal ***,the hemodynamic performances of the different shroud designs have not been studied *** this study,ten different shroud designs were made and divided into two groups as the different covering locations(A:Covering the blade leading edge,B:Covering the blade trailing edge).In every group,six shroud designs with the covering proportions of 0,1/5,2/5,3/5,4/5,1 were *** computational fluid dynamics(CFD)analyses were performed to investigate their effects on hemodynamics and hydraulic performance at the constant flow condition(4000 rpm,5 L/min).The percentage volumes of the scalar shear stress in specific threshold(τ9 Pa:the destruction of von Willebrand factor,τ>50 Pa:Platelet activation,τ>150 Pa:Break of red blood)were used to compare the blood damage of the different shroud ***,the modified index of hemolysis(MIH)were calculated based on a Eulerian approach for different *** simulations predicted an increase in the pump head,hydraulic efficiency,a fraction of fluid volume with scalar shear stress values above a threshold(9 Pa,50 Pa,150 Pa)and MIH with increasing shroud covering proportions from 0 to 1 in the same covering ***,these above results were higher in group B than group *** means that the risks of the hemolysis,thrombosis and bleeding increased as the rise of the covering proportion and they were higher in the pump whose shroud covers the blade trailing edge.

关键词： Computational fluid dynamics(CFD) hemodynamics centrifugal blood pump shroud design blood damage thrombosis hemolysis

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Microstructure and grain orientation evolution of a specially shaped shroud during directional solidification process

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Progress in Natural Science:Materials International 2013年第2期23卷 211-215页

作者： Hongquan Hao Weiguo Jiang Guang Xie Gong Zhang Yuzhang Lu Jian Zhang Langhong Lou Institute of Metal Research Chinese Academy of Sciences

The microstructure and the grain orientations of one shroud prepared by directional solidification process have been investigated using metallographic method and electronic backscatter diffraction (EBSD). The results indicate that the solidification process of the tested shroud is composed of three steps: dendritic branching, the break-up and drift of the dendrite arms and the solidification of the residual liquid. Misoriented grains were formed between the primarily solidified dendrite stems during the process of recalescence which was caused by the accumulation of the solidification latent heat. A low angle grain boundary of 61 was produced across the impinging dendrite fronts.

关键词： Directional solidification shroud Dendrite Undercooling Low angle grain boundary

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Geometric triangular chiral hexagon complexes and clonal embryogenic body organization on the Turin shroud crucified man image: A predictable tissue response to injury

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Natural Science 2013年第10期5卷 1102-1111页

作者： Jairo A. Diaz Department of Pathology Medicine School Laboratory of Pathology Hospital Departmental of Villavicencio Hospital Departmental of Granada University Cooperative of Colombia Villavicencio Colombia

The shroud continues to remain one of the most studied and controversial artifacts in human history. Many tests, X-ray fluorescence, reflectance, spectrometry and low energy/high-resolution X ray transmission have shown that the crucified body is not compatible with a painted image. Researchers confirm that the alleged blood is real blood. We documented the self-assembly of geometric triangular chiral hexagon complex (GTCHC) with structural organization of embryoid bodies in cancer tissues. The identification of these structures is not only limited to malignant tumors but also appears in extreme injured tissues. Our interest is to determine if we can predict and identify these patterns in the shroud of Turin. Based on pattern recognition image was analyzed over 100 shroud images. We identified a central spectral emission line that exhibits a characteristic signature on a plot of residual electromagnetic radiation, head area narrowing and low extremities broadening, indication of decay energy changes in the velocity of the molecules in the traversal trajectory. This Electromagnetic collision event generates in the cloth stagnant blood areas with patterns identical to those identified for us in cancer damage tissues. Inflammatory cytokines activate stem cells and Notch signaling proteins in cascade of interactions to generate real clonal human embryoid template. Can we predict function from structure? These structures evoke life, regeneration, but not death. Our findings suggest the image of a crucified man on the shroud of Turin is a real physical electromagnetic collision event in response to extreme tissue injury, with the fact that supports our previous findings in cancer tissues as real and predictable. Proteins derived from these emergent damage tissue derivate stem cells could be used to design biologic templates in regenerative medicine and develop novel strategies in cancer therapy.

关键词： Turin shroud Geometric Triangular Chiral Hexagon Embryogenic

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Cold Acid Postmortem Blood Most Probably Formed Pinkish-Red Heme-Madder Lake on Madder-Dyed shroud of Turin

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Open Journal of Applied Sciences 2015年第11期5卷 705-746页

作者： Adrie A. M. van der Hoeven Utrecht The Netherlands

The Turin shroud was extensively scientifically investigated in 1978. In its pinkish red bloodstains, normal features of human blood were found, but also seemingly anomalous ones. In the present study, hitherto unnoticed details of the data are presented, shroud data and more modern reference data are compared, and the results of a few experiments with linen, madder dye and blood are shown. It turns out that the shroud’s ‘anomalous’ data are strong consistent evidence that its bloodstains contain acid heme-madder lake, of which the heme derived from cold acid postmortem blood and the madder had been applied to the shroud at manufacture. It implies that the bloodstains were formed on the shroud before the still not reproduced body-image was. Several other ‘red-color’ hypotheses for the shroud’s bloodstains are discussed and dismissed.

关键词： Turin shroud Blood Madder Forensic Medicine Spectroscopy

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Design and Analysis of a Dual Rotor Turbine with a shroud Using Flow Simulations

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Journal of Power and Energy Engineering 2017年第4期5卷 25-40页

作者： Peter E. Jenkins Abdalfadel Younis Yuxuan Chen Mechanical Engineering Department University of Colorado Denver USA

This paper describes the flow simulation of a dual rotor, three-bladed wind turbine module with a shroud to determine its performance. The parameters that were evaluated are the effects of adding a second rotor, wind speed, distance between the two rotors, the size of the front rotor and the shroud. The results were obtained by using the Solid Works 2015 flow simulation program. Also, the benefits and cost issues for wind generating systems are illustrated.

关键词： Design and Analysis of a Dual Rotor Turbine with a shroud Using Flow Simulations

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Flow Simulation to Determine the Effects of shrouds on the Performance of Wind Turbines

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Journal of Power and Energy Engineering 2016年第8期4卷 79-93页

作者： Peter E. Jenkins Abdalfadel Younis Mechanical Engineering Department University of Colorado Denver USA

This paper describes a flow simulation model used to determine the effects of a shroud on the performance of a wind turbine. Also, it focuses on comparing the standard type of wind turbines— upwind turbine with three blades fixed on a horizontal axis—with a new type that is called a shrouded wind turbine. In addition, the two types of turbines are compared in terms of velocities profiles, pressure distribution and power output when applying four different velocities of winds: 10, 20, 30, 40 mph. Numerical values and graphs are highlighted in order to show the main differences between the shrouded turbine and the conventional one. Finally, a conclusion and some recommendations are provided to summarize the scope of this research and give a better prediction for a future optimal design of the shrouded turbines.

关键词： Wind Turbine Flow Simulation shroud

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AERODYNAMIC ANALYSIS OF HELICOPTER shroudED TAIL ROTOR BY MOMENTUM THEORY

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Transactions of Nanjing University of Aeronautics and Astronautics 1998年第2期15卷 50-54页

作者：徐国华王适存南京航空航天大学直升机技术研究所

In this paper, in order to clarify the gains of the shroud in the shrouded tail rotor system, a thrust division factor q , which represents the ratio of the shroud thrust to the total thrust of the shrouded tail rotor, is introduced. With the help of q , the slipstream theory for the static and axial flow states of the shrouded tail rotor are fully derived. Based on the sliptream theory, the variations of the thrust, power and disk area against q for different cases are emphatically analysed and the comparisons between a shrouded tail rotor and an isolated one are made. It is shown that, although the shroud can provide as much as 50% of the total thrust of shrouded tail rotor for the static state, the thrust gains of the shroud rapidly decrease for the axial flow state, which depends on the flow velocity ratio.

关键词： helicopters tail rotors shroud aerodynamic analysis

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Characterization of aerodynamic performance of wind-lens turbine using high-fidelity CFD simulations

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Frontiers in Energy 2022年第4期16卷 661-682页

作者： Islam HASHEM Aida A.HAFIZ Mohamed H.MOHAMED Mechanical Power Engineering Department Faculty of Engineering-MatariaHelwan UniversityCairo 11718Egypt State Key Laboratory of Hydroscience and Engineering Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Mechanical Engineering Department College of Engineering and Islamic ArchitectureUmm Al-Qura UniversityMakkah5555Saudi Arabia

Wind-lens turbines(WLTs)exhibit the prospect of a higher output power and more suitability for urban areas in comparison to bare wind *** wind-lens typically comprises a diffuser shroud coupled with a flange appended to the exit periphery of the ***-lenses can boost the velocity of the incoming wind through the turbine rotor owing to the creation of a lowpressure zone downstream the flanged *** this paper,the aerodynamic performance of the wind-lens is computationally assessed using high-fidelity transient CFD simulations for shrouds with different profiles,aiming to assess the effect of change of some design parameters such as length,area ratio and flange height of the diffuser shroud on the power *** power coefficient(Cp)is calculated by solving the URANS equations with the aid of the SST k–ω***,comparisons with experimental data for validation are accomplished to prove that the proposed methodology could be able to precisely predict the aerodynamic behavior of the windlens *** results affirm that wind-lens with cycloidal profile yield an augmentation of about 58%increase in power coefficient compared to bare wind turbine of the same rotor *** is also emphasized that diffusers(cycloid type)of small length could achieve a twice increase in power coefficient while maintaining large flange heights.

关键词： shroud diffuser-augmented wind turbine(DAWT) Betz limit aerodynamics computational fluid dynamics(CFD)

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Sharing Culture and Belonging Through Cross-Cultural Collaborative Painting

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Journal of Literature and Art Studies 2014年第6期4卷 483-488页

作者： Vanessa Maree Barbay Australian National University Canberra Australia

The topic of this paper is animals in painting and the investigative process undertaken by the artist Vanessa Barbay during her practice--led Ph.D.. Her aim was to discover a way to present deceased animals that retained their agency as individuals by challenging the objectifying nature of representation. The foundation of this method was the collaboration between artist and dead animal subjects through harnessing the natural decomposition of the subject in order to generate their image. A related stream of Barbay＇s research was learning about the art and culture of Kunwinjku speaking artists living in Kunbarlanja Western Amhem Land where artists have painted images of animals on rock shelters and on bark from ancient through to contemporary times. The significance of their form of animal representation is a mythopoeic relationship between locally found pigments and animal bodies. Paintings are considered as collaboration between matter, subject, and artist, which Barbay extends in her current work centred on collaborative painting involving more than one artist.

关键词： painting animals pigments Kunwinjku shroud decomposition

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