Optimum photolysis in Taylor–Couette flow

Forney, Larry J.; Pierson, John A.

doi:10.1002/aic.690490316

Cited by 16 publications

(13 citation statements)

References 17 publications

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“…The first design approach used a thin-film flow for liquid foods, e.g. CiderSure reactor that was developed as a UV light processing equipment in 1998 (FPE Inc., Macedon, NY) (CiderSure, 2010) and the Taylor-Couette flow UV reactor constructed by Pierson in 2003 (Forney &Pierson, 2003). A second design approach focused on increasing of the turbulence within a UV reactor, e.g.…”

Section: Introductionmentioning

confidence: 44%

Processing of clear and turbid grape juice by a continuous flow UV system

Kaya

Ünlütürk

2016

Innovative Food Science & Emerging Technologies

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The inactivation of inoculated (S. cerevisiae) and spoilage microorganisms, i.e. yeasts and lactic acid bacteria (LAB), in clear and turbid grape juice was investigated using a pilot scale UV system. The biodosimetry method was used for UV dose prediction in a continuous flow UV reactor. Weibull model was applied for fitting the inactivation data. The flow rates (774, 820 ml/min) in this system were very close to the ones used in fruit juice processing. S. cerevisiae in clear juice was reduced by 3.39 ± 0.04 at 65.50 mJ/cm 2 of UV dose. 1.54 ± 0.04 and 1.64 ± 0.03 log CFU/ml reductions were obtained for spoilage yeasts and LAB in turbid juice at UV dose of 78.56 and 67.97 mJ/cm 2 , respectively. The soluble solids (°Brix) and pH of grape juice samples were not affected by UV-C treatment (p N 0.05). Although the color parameters slightly were changed after irradiation, the color of PCGJ and FSTGJ did not show visual difference compared to the untreated samples.

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Section: Introductionmentioning

confidence: 44%

Processing of clear and turbid grape juice by a continuous flow UV system

Kaya

Ünlütürk

2016

Innovative Food Science & Emerging Technologies

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“…Previous studies on the effects of radiation in Taylor−Couette flow are the growth of algae () and the development of a reactor for heterogeneous photocatalysis (). More recently, Forney and Pierson ( , ) considered a fast photolytic reaction and demonstrated that optimum photoefficiencies could be achieved if the radiation penetration depth was equal to the velocity, boundary layer thickness. The latter work also provided a scaling law for the yield in both Taylor−Couette and channel flows.…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet Disinfection: Similitude in Taylor−Couette and Channel Flow

2003

Environ. Sci. Technol.

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The inactivation data for Escherichia coli are recorded for the three reactor geometries of Taylor-Couette flow and flow between either concentric cylinders or a square channel. All of the data are shown to be correlated with the assumption of plug flow. In particular, the effects of nonuniform radiation levels are accounted for by integration across the fluid channel as done previously. However, a new correction factor is introduced that is shown to be inversely proportional to the laminar, velocity boundary thickness to account for the effects of a concentration boundary layer of surviving pathogen. It has also been demonstrated that the common problems of nonuniform radiation levels and concentration boundary layer effects in UV reactors are largely eliminated with the use of Taylor-Couette flow. Moreover, the repetitive exposure of fluid parcels to a small number of lamps in the rotating Taylor-Couette flow decreases maintainance requirements compared to the hydrodynamic equivalent of cross-flow over a tube bank or lamp array. Over a 3-log reduction in the inactivation of E. coli was demonstrated compared to a conventional channel with the same radiation dosage. Moreover, greater than a 2-log reduction was evident compared to flow through concentric cylinders.

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“…The group of Forney considered fast photocatalytic reactions, like the oxidation of iodide (I − ) to iodate (I 3 − ) 105 . They developed a law of similarity for the product development incorporating Taylor‐vortices and investigated the optimal operating parameters of the TCR ( Ta , ω ) to maximize photoefficiency, which occurred when the radiation penetration depth equals the boundary‐layer thickness.…”

Section: Application Of the Tcr In Process Technologymentioning

confidence: 99%

Taylor‐Couette reactor: Principles, design, and applications

et al. 2021

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The Taylor-Couette reactor (TCR) is an apparatus that capitalizes on the Taylor-Couette flow, which allows many flow regimes and conditions to perform (bio-)chemical conversions with precise control of various reactor characteristics. With the possibility to continuously perfuse the reactor with a reaction medium, the TCR becomes interesting for chemical engineering applications. In this review we introduce this reactor type and provide an overview of its history, principles of the flow regimes, and a description and design aspects of the reactors and their elements. Available information in the literature is summarized and harmonized to present available formulas and correlations in a consistent set of variables. Additionally, a wide number of applications in process technology is covered, including reactions in homogeneous, photo and enzymatic catalysis, polymer synthesis, and crystallization and aggregation-flocculation processes. Focusing on this reactor configuration, this article intends to be used as a hub for scientific groups interested in TCRs. This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as

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Optimum photolysis in Taylor–Couette flow

Cited by 16 publications

References 17 publications

Processing of clear and turbid grape juice by a continuous flow UV system

Processing of clear and turbid grape juice by a continuous flow UV system

Ultraviolet Disinfection: Similitude in Taylor−Couette and Channel Flow

Taylor‐Couette reactor: Principles, design, and applications

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