Effect of Taylor vortices on mass transfer from a rotating cylinder

Srinivasan, Ram; Jayanti, S.; Kannan, A.

doi:10.1002/aic.10553

Cited by 16 publications

(21 citation statements)

References 23 publications

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“…With respect to actual mixing (the second mechanism), we are currently completing flow visualization studies of the rotational fiber bundle prototype. Preliminarily results indicate that the fiber bundle rotation does appear to create Taylor vortices [41][42][43][44] between the bundle and the vessel wall, which, if confirmed, would increase mixing between the fiber bundle and the flow past the bundle. Taylor vortices are secondary flow patterns with characteristic velocities that are an order of magnitude less than those in the angular rotational direction.…”

Section: Discussionmentioning

confidence: 88%

Evaluation of Fiber Bundle Rotation for Enhancing Gas Exchange in a Respiratory Assist Catheter

Eash¹,

Mihelc²,

Frankowski³

et al. 2007

ASAIO Journal

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Supplemental oxygenation and carbon dioxide removal through an intravenous respiratory assist catheter can be used as a means of treating patients with acute respiratory failure. We are beginning development efforts toward a new respiratory assist catheter with an insertional size <25F, which can be inserted percutaneously. In this study, we evaluated fiber bundle rotation as an improved mechanism for active mixing and enhanced gas exchange in intravenous respiratory assist catheters. Using a simple test apparatus of a rotating densely packed bundle of hollow fiber membranes, water and blood gas exchange levels were evaluated at various rotation speeds in a mock vena cava. At 12,000 RPM, maximum CO2 gas exchange rates were 449 and 523 mL/min per m2, water and blood, respectively, but the rate of increase with increasing rotation rate diminished beyond 7500 RPM. These levels of gas exchange efficiency are two- to threefold greater than achieved in our previous respiratory catheters using balloon pulsation for active mixing. In preliminary hemolysis tests, which monitored plasma-free hemoglobin levels in vitro over a period of 6 hours, we established that the rotating fiber bundle per se did not cause significant blood hemolysis compared with an intra-aortic balloon pump. Accordingly, fiber bundle rotation appears to be a potential mechanism for increasing gas exchange and reducing insertional size in respiratory catheters.

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Section: Discussionmentioning

confidence: 88%

Evaluation of Fiber Bundle Rotation for Enhancing Gas Exchange in a Respiratory Assist Catheter

Eash¹,

Mihelc²,

Frankowski³

et al. 2007

ASAIO Journal

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show abstract

“…This is in contrast to turbulent flow where additional model equations are required to provide closure (Srinivasan et al, 2005). Hence, the error may arise mainly from numerical discretization of the time and space domains.…”

Section: Validation Of Temperatures and Heat Flux Data Obtained From Cfdmentioning

confidence: 90%

Heat transfer analysis of canned food sterilization in a still retort

Kannan

Sandaka

2008

Journal of Food Engineering

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“…We anticipated that the flow patterns arising between the rotating fiber bundle and the vessel wall would exhibit the characteristic Taylor centrifugal instability that leads to the generation of toroidal vortices (Taylor vortices), a well‐studied phenomenon in the rotational flow between concentric cylinders when the inner cylinder rotates relative to a fixed outer cylinder (24–26). The characteristics of Taylor vortices depend on the ratio of centrifugal to viscous forces as described by the Taylor (Ta) number (24):…”

Section: Resultsmentioning

confidence: 99%

Flow Visualization Study of a Novel Respiratory Assist Catheter

et al. 2009

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Respiratory assist using intravenous catheters may be a potential therapy for patients with acute and acute-on-chronic lung failure. An important design constraint is respiratory catheter size, and new strategies are needed that enable size reduction while maintaining adequate gas exchange. Our group is currently developing a percutaneous respiratory assist catheter (PRAC) that uses a rotating bundle of hollow fiber membranes to enhance CO(2) removal and O(2) supply with increasing bundle rotation rate. In this study, particle image velocimetry (PIV) was used to analyze the fluid flow patterns and velocity fields surrounding the rotating fiber bundle of the PRAC. The goal of the study was to assess the rotational flow patterns within the context of the gas exchange enhancement that occurs with increasing fiber bundle rotation. A PRAC prototype was placed in a 1-in. internal diameter test section of an in vitro flow loop designed specifically for PIV studies. The rotation rate of the PRAC was varied between 500 and 7000 rpm, and PIV was used to determine the velocity fields in the primary (r-theta) and secondary (r-z) flow planes. The secondary flow exhibited time-varying and incoherent vortices that were consistent with the classical Taylor vortices expected for Taylor numbers (Ta) corresponding to the rotation speeds studied (2200 < Ta < 31 000). In the primary flow, the tangential velocity exhibited boundary layers of less than (1/2) mm adjacent to the fiber bundle and vessel wall. The estimated shear stress associated with the Taylor vortices was approximately 11 dyne/cm(2) at 7000 rpm and was over 10 times smaller than the shear stress in the primary flow boundary layers.

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Effect of Taylor vortices on mass transfer from a rotating cylinder

Cited by 16 publications

References 23 publications

Evaluation of Fiber Bundle Rotation for Enhancing Gas Exchange in a Respiratory Assist Catheter

Evaluation of Fiber Bundle Rotation for Enhancing Gas Exchange in a Respiratory Assist Catheter

Heat transfer analysis of canned food sterilization in a still retort

Flow Visualization Study of a Novel Respiratory Assist Catheter

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