Search Results - "Vlaev, D"

Measurements of gas–liquid mixing in a stirred vessel using electrical resistance tomography (ERT) by Wang, M, Dorward, A, Vlaev, D, Mann, R

“…The non-invasive measurement of mixing inside a stirred vessel in 3-D, using an 8×16 array of resistance tomography sensors, provides powerful opportunities…”
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A networks-of-zones analysis of mixing and mass transfer in three industrial bioreactors by Zahradnı́k, J., Mann, R., Fialová, M., Vlaev, D., Vlaev, S.D., Lossev, V., Seichter, P.

“…The original version of the networks-of-zones (N-o-Z) model developed for the description of gas–liquid flow in stirred-vessel reactors (R. Mann, Gas–liquid…”
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Shear and skin friction on particles in power-law fluids agitated by flat-blade and fluid foil impellers by Vlaev, S.D., Nikov, I., Martinov, M.

“…The shear rates that exert angular deformation on spherical particles have been measured. The particles are mimiced by a spherical probe. The probe has been…”
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Gas-Liquid Mass Transfer in Fibrous Bed Reactor with Counter-Current Liquid Recycle by Martinov, M., Hadjiev, D., Vlaev, S. D.

“…In this work, the gas‐liquid mass transfer in a lab‐scale fibrous bed reactor with liquid recycle was studied. The volumetric gas‐liquid mass transfer…”
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Hydrodynamic characterization of dual-impeller submerged membrane bioreactor relevant to single-use bioreactor options by Vlaev, Serafim D., Tsibranska, Iren, Dzhonova-Atanasova, Daniela

“…[Display omitted] •A scalable standard mixing vessel configuration comprising a dual impeller and tubular membrane module is analyzed.•The analysis shows…”
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Bubble-bed structural models for hybrid flow simulation: an outlook based on a CFD generated flow image by Staykov, P., Fialova, M., Vlaev, S.D.

“…A major problem of hybrid modelling is the selection of the most realistic structural flow model to represent a reactor equipment unit. Based on CFD…”
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Detecting filter-cake pathologies in solid–liquid filtration: semi-tech scale demonstrations using electrical resistance tomography (ERT) by Vlaev, D, Wang, M, Dyakowski, T, Mann, R, Grieve, B.D

“…Solid–liquid filtration monitoring by means of a single inexpensive 16-element ring sensor array for electrical resistance tomography (ERT) is described. The…”
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Shear stress generated by radial flow impellers at bioreactor integrated membranes by Vlaev, S. D., Tsibranska, I.

“…The study reveals the hydrodynamics at the surface of a submerged tubular membrane module integrated in a stirred membrane bioreactor. The reactor is equipped…”
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Macro-mixing and Streptomyces fradiae modelling oxygen and nutrient segregation in an industrial bioreactor by Vlaev, D, Mann, R, Lossev, V, Vlaev, S D, Zahradnik, J, Seichter, P

“…Some illustrative results are presented for a 3 m super(3) triple-impeller stirred reactor producing tylosin (using Streptomyces fradiae) being fed with air…”
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Experimental Visualization and CFD Simulation of Flow Patterns Induced by a Novel Energy-Saving Dual-Configuration Impeller in Stirred Vessels by Mavros, P., Mann, R., Vlaev, S.D., Bertrand, J.

“…The flow characteristics of a novel agitator, termed ‘Narcissus’ (NS), have been investigated by dye-tracer visualization and laser Doppler velocimetry; the…”
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Novel areas and future trends of computational fluid dynamics software applications in chemical engineering by O. Faltsi, S. D. Vlaev, D. Sofialidis, J. Kirpitsas

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A 3-D Analysis of Gas-Liquid Mixing, Mass Transfer and Bioreaction in a Stirred Bio-Reactor by Hristov, H., Mann, R., Lossev, V., Vlaev, S.D., Seichter, P.

“…Gas-liquid stirred vessel two-phase mixing accompanied by bioreaction has been analysed using a 3-D networks-of-zones, in which non-axisymmetric phenomena can…”
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Some effects of rheology on the spatial distribution of gas hold-up in a mechanically agitated vessel by Vlaev, Serafim D., Valeva, Minka D., Mann, Reg

“…The effects of rheology on gas hold-up in non-Newtonian circulation flow has been rarely discussed in the literature, especially so far as local gas…”
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Agitation Effects and Kinetic Constants of Exoglucomannan Production by Antarctic Yeast Strain in a Stirred Tank Bioreactor by Vlaev, S. D.

“…Exoglucomannan production by Antarctic yeast Sporobolomyces salmonicolor [AL.sub.1] is studied at semi-tech scale in a 5 L stirred tank bioreactor and the…”
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Pressure distribution at impeller blades of some radial flow impellers in saccharose and xanthan gum solutions: a CFD visualization approach by Vlaev, S.D, Staykov, P, Popov, R

“…Food-mixing operations often require distribution of components, e.g. sweeteners and thickeners, in various liquids, e.g. syrups or pulps. Generation of…”
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Bubble Column Bioreactors: Comparison with Stirred Fermenters Based on Local Gas Hold-up Distribution by Vlaev, Serafim D., Fialova, Marie

“…Local gas hold‐up in viscous aerated batches in bubble column and impeller gas dispersion devices was studied. Unlike the former analyses valid for water, the…”
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A Simplified CFD for Three-dimensional Analysis of Fluid Mixing, Mass Transfer and Bioreaction in a Fermenter Equipped with Triple Novel Geometry Impellers by Hristov, H.V., Mann, R., Lossev, V., Vlaev, S.D.

“…A Three-dimensional networks-of-zones model has been developed to describe the performance of a novel geometry Narcissus (NS) impeller when used for gas–liquid…”
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Increasing gas-liquid mass transfer in stirred power law fluids by using a new energy-saving impeller by MARTINOV, M, VLAEV, S. D

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Small-scale liquid mixing in a bioreactor column with xanthan-gum simulated filamentous media by Sisak, Cs, Venyige, T., Martinov, M., Vlaev, S. D.

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Oxygen transfer deficiencies in starch-based media by Vlaev, S.D, Valeva, M

“…Insufficient oxygen transfer in a highly viscous media with varying viscosity occurs during the degradation of starch byBacillus licheniformis. Oxygen transfer…”
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