Notes on the role of viscosity, vorticity and dissipation in incompressible flows

Buresti, Guido

doi:10.1007/s11012-009-9216-0

Cited by 9 publications

(4 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…S4) from a wall orifice, and thus, velocity fluctuations in tandem with vortices were formed. Then, the vortices would develop under the effect of viscous diffusion and pressure distribution ( 18 ). Because of the friction against the wall, the pressure gradient is smaller at the inlet and gradually increases toward the outlet ( 19 ).…”

Section: Resultsmentioning

confidence: 99%

Acoustic-assisted assembly of an individual monochromatic ultralong carbon nanotube for high on-current transistors

et al. 2016

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 99%

Acoustic-assisted assembly of an individual monochromatic ultralong carbon nanotube for high on-current transistors

et al. 2016

View full text Add to dashboard Cite

show abstract

“…In our study, the increased blood damage with Impella CP under conditions of outlet obstruction, compared to normal operating conditions, can be explained by the increase in the exposure time to SS >425 Pa by >3 times due to flow restriction and increase in turbulence. Interestingly, a theoretical link between turbulent flows and SS has been proposed and evaluated by others, 24,25 demonstrating that energy dissipation should be considered in addition to bulk SS. Based on this concept, the specific energy dissipation of the blood near the impeller and pump housing of the Impella CP was calculated for normal and obstructed outlet conditions, similar to the in vitro hemolysis testing.…”

Section: Discussionmentioning

confidence: 99%

Hemolysis associated with Impella heart pump positioning: In vitro hemolysis testing and computational fluid dynamics modeling

et al. 2020

View full text Add to dashboard Cite

Introduction: Short-term mechanical circulatory support devices provide temporary hemodynamic support in heart failure and are increasingly used to enable recovery or as a bridge to decision. Blood damage with mechanical circulatory support devices is influenced by many factors, including the magnitude and duration of shear stress and obstruction to blood flow. This study aimed to evaluate the effects of the Impella CP® heart pump positioning on hemolysis using in vitro hemolysis testing and computational fluid dynamics modeling. Methods: The in vitro hemolysis testing was conducted per the recommended Food and Drug Administration and American Society for Testing and Materials guidelines. The bench hemolysis testing and computational fluid dynamics simulation analysis were performed for both normal operating (outlet unobstructed) and outlet-obstructed condition of Impella CP (mimicking outlet on the aortic valve due to improper positioning). Results: The modified index of hemolysis was 2.78 ± 0.69 at normal operating conditions compared to 18.7 ± 7.8 when the Impella CP outlet was obstructed ( p = 0.002). Computational fluid dynamics modeling showed about three times increase in exposure time to regions of high shear stress when the Impella CP outlet was obstructed compared to unobstructed condition, thus supporting the experimental observations. Conclusion: Based on these results, it is recommended to ensure proper placement of Impella CP via regular monitoring using echocardiographic guidance or other methods to minimize the risk of hemolysis associated with an obstructed outflow.

show abstract

“…169 With the disturbance of a periodic jet driven by a loudspeaker, velocity fluctuations in tandem with vortices are generated. Owing to the effect of viscous and pressure diffusion, the vortices would propagate downstream and interact with each other, 170 stretching and rotating to form smaller vortices. Because of a spatially symmetric interaction, the small vortices become isotropic, resulting in a round shape as a secondary structure.…”

Section: Orientation-controlled Synthesis Of Swntsmentioning

confidence: 99%

Horizontal Single-Walled Carbon Nanotube Arrays: Controlled Synthesis, Characterizations, and Applications

Zhang

2020

Chem. Rev.

View full text Add to dashboard Cite

Single-walled carbon nanotubes (SWNTs) emerge as a promising material to advance carbon nanoelectronics. However, synthesizing or assembling pure metallic/semiconducting SWNTs required for interconnects/integrated circuits, respectively, by a conventional chemical vapor deposition method or by an assembly technique remains challenging. Recent studies have shown significant scientific breakthroughs in controlled SWNT synthesis/assembly and applications in scaled field effect transistors, which are a critical component in functional nanodevices, thereby rendering the horizontal SWNT array an important candidate for innovating nanotechnology. This review provides a comprehensive analysis of the controlled synthesis, surface assembly, characterization techniques, and potential applications of horizontally aligned SWNT arrays. This review begins with the discussion of synthesis of horizontally aligned SWNTs with regulated direction, density, structure, and theoretical models applied to understand the growth results. Several traditional procedures applied for assembling SWNTs on target surface are also briefly discussed. It then discusses the techniques adopted to characterize SWNTs, ranging from electron/probe microscopy to various optical spectroscopy methods. Prototype applications based on the horizontally aligned SWNTs, such as interconnects, field effect transistors, integrated circuits, and even computers, are subsequently described. Finally, this review concludes with challenges and a brief outlook of the future development in this research field.

show abstract

Notes on the role of viscosity, vorticity and dissipation in incompressible flows

Cited by 9 publications

References 25 publications

Acoustic-assisted assembly of an individual monochromatic ultralong carbon nanotube for high on-current transistors

Acoustic-assisted assembly of an individual monochromatic ultralong carbon nanotube for high on-current transistors

Hemolysis associated with Impella heart pump positioning: In vitro hemolysis testing and computational fluid dynamics modeling

Horizontal Single-Walled Carbon Nanotube Arrays: Controlled Synthesis, Characterizations, and Applications

Contact Info

Product

Resources

About