Radiotracer applications for the analysis of complex flow structure in industrial apparatuses

Thýn, J.; Žitný, Rudolf

doi:10.1016/s0168-583x(03)01648-3

Cited by 18 publications

(8 citation statements)

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“…1 The RTD can be determined from tracer injection experiments [2][3][4][5][6][7] and has been characterized for different reactors like microchannel reactors, 8 foam packed trickle flow reactors, 9 annular centrifugal extractors, 10 and the rotating disc reactor. 11 In this article, we present a single-phase model for a rotor-stator spinning disc reactor (SDR), which is based on residence time distribution measurements.…”

Section: Introductionmentioning

confidence: 99%

Residence time distribution in a single‐phase rotor–stator spinning disk reactor

et al. 2013

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A reactor model for the single-phase rotor-stator spinning disc reactor based on residence time distribution measurements is described. For the experimental validation of the model, the axial clearance between the rotor and both stators is varied from 1.0 3 10 23 to 3.0 3 10 23 m, the rotational disc speed is varied from 50 to 2000 RPM, and the volumetric flow rate is varied from 7.5 3 10 26 to 22.5 3 10 26 m 3 s 21 . Tracer injection experiments show that the residence time distribution can be described by a plug flow model in combination with 2-3 ideally stirred tanks-in-series. The resulting reactor model is explained with the effect of turbulence, the formation of Von K arm an and B€ odewadt boundary layers, and the effect of the volumetric flow rate.

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Section: Introductionmentioning

confidence: 99%

Residence time distribution in a single‐phase rotor–stator spinning disk reactor

et al. 2013

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“…Whereas the comparison of experimental and CFD predicted head and power serves as macroscopic validation of CFD simulations, the comparison of results of real and virtual tracer experiments serves as an indirect validation for the entire flow field predicted by the CFD simulations. A similar approach of validation of CFD simulations using tracer experiment data has been reported earlier for different process equipment. − However, the main objective of the tracer experiments reported here is to determine the deviation of the pump−mixer from a perfectly mixed vessel and prescribe the compartment models in which it is represented as a series and/or parallel combination of ideal flow vessels.…”

Section: Introductionmentioning

confidence: 90%

“…A similar approach of validation of CFD simulations using tracer experiment data has been reported earlier for different process equipment. [35][36][37] However, the main objective of the tracer experiments reported here is to determine the deviation of the pump-mixer from a perfectly mixed vessel and prescribe the compartment models in which it is represented as a series and/or parallel combination of ideal flow vessels.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Modeling of a Bench-scale Pump−Mixer: Head, Power and Residence Time Distribution

Singh¹,

Mahajani²,

Shenoy³

et al. 2007

Ind. Eng. Chem. Res.

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The present work involves several single-phase computational fluid dynamics (CFD) simulations of a continuous-flow bench-scale pump-mixer that uses a top-shrouded turbine with trapezoidal blades. Baffleimpeller interaction has been modeled using the sliding-mesh approach. The standard k-model has been used for turbulence modeling. CFD simulations have been used to predict power consumption and the head generated by the pump-mix impeller, as well as to conduct virtual tracer experiments. Results from CFD simulations have been validated with the experimental data obtained on a physical counterpart. Virtual residence time distribution (RTD) curves have been used to perform compartment modeling of the pump-mixer. A significant difference in the hydrodynamic behavior between the low clearance design and the high clearance design has been observed.

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“…Examples of radiotracers used in industry are technetium-99m ( 99m Tc) and tritium ( 3 H) for the aqueous phase, bromine-82 ( 82 Br) and iodine-131( 131 I) for organic phase, gold-198 ( 198 Au) and lanthanum-140 ( 140 La) for solid phase, and argon-41 ( 41 Ar) for gases. Radiotracer techniques have been used to understand the process and bring about improvement in the chemical industry [1], to determine the mixing effi ciency in industrial applications [2], to make use of residence time distribution (RTD) measurements to analyse complex fl ow [3], and to detect lining wear, and location of pipelines leaks [4]. The advancements in the methodology include radioactive particle tracking (RPT), which has been used to investigate the hydrodynamic parameters in bubble column reactor [5], study solids motion in a fl uidized bed [6], and fl uid tracking [7].…”

Section: Introductionmentioning

confidence: 99%

Prompt gamma-ray methods for industrial process evaluation: A simulation study

et al. 2022

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Radioisotope applications in industrial process inspection and evaluation using gamma-ray emitters provide otherwise unavailable information. Offering alternative gamma-ray sources can support the technology by complementing sources’ availability and radiation safety. This work proposes to replace gamma-ray from radioisotopes with prompt gamma-ray from the interaction of neutrons with stable isotopes injected into the industrial process or with the structural material of the industrial process equipment. Monte Carlo N-Particle Transport Code (MCNP5) was used to simulate the irradiation of two-phase flow pipes by 252Cf neutron source. Two simulations were run for each pipe, with and without mixing the liquid phase with the stable isotope 157Gd. The detected gamma-ray spectra were analysed, and images of the two phases inside the pipes were produced. The images were compared to images obtained from simulations of gamma transmission measurement using 60Co. Furthermore, results for prompt gamma computed tomography (CT) were presented and discussed. The studies’ outcomes indicate the potential of prompt gamma-ray to carry out the sealed sources applications of gamma transmission measurements and imaging.

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Radiotracer applications for the analysis of complex flow structure in industrial apparatuses

Cited by 18 publications

References 0 publications

Residence time distribution in a single‐phase rotor–stator spinning disk reactor

Residence time distribution in a single‐phase rotor–stator spinning disk reactor

Computational Fluid Dynamics Modeling of a Bench-scale Pump−Mixer: Head, Power and Residence Time Distribution

Prompt gamma-ray methods for industrial process evaluation: A simulation study

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