Search results

1

Numerical modelling of a microreactor for thermocatalytic decomposition of toxic compounds

100%

Jóźwik P., Karcz M., Badur J.

Chemical and Process Engineering

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2011

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vol. 32

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issue 3

215-227

EN

In this paper a three-dimensional model for determination of a microreactor's length is presented and discussed. The reaction of thermocatalytic decomposition has been implemented on the base of experimental data. Simplified Reynolds-Maxwell formula for the slip velocity boundary condition has been analysed and validated. The influence of the Knudsen diffusion on the microreactor's performance has also been verified. It was revealed that with a given operating conditions and a given geometry of the microreactor, there is no need for application of slip boundary conditions and the Knudsen diffusion in further analysis. It has also been shown that the microreactor's length could be practically estimated using standard models.

2

Przydatność metody CFD w diagnostyce i leczeniu chorób krtani

100%

Gamrot-Wrzoł M., Marków M., Janecki D., Misiołek M.

Polski Przegląd Otorynolaryngologiczny

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2020

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vol. 9(2)

23-26

PL

Metoda komputerowej dynamiki płynów (Computational Fluid Dynamics; CFD) to dział mechaniki płynów wykorzystujący metody numeryczne do rozwiązywania zagadnień przepływu płynów. W niniejszej pracy dokonano przeglądu piśmiennictwa dotyczącego zastosowania metody CFD w ocenie przepływu powietrza przez górne drogi oddechowe (GDO), ze szczególnym uwzględnieniem krtani. Metoda ta staje się obecnie bardzo przydatnym narzędziem nie tylko do analizy schematów przepływu powietrza i mechanizmu osadzania się cząstek w krtani, ale także do uzyskania informacji dotyczących zmian temperatury, ciśnienia, naprężeń ścinających w GDO. Jest ona narzędziem, z użyciem którego można bezpiecznie zaplanować leczenie operacyjne, jak również przewidzieć jego potencjalne skutki.

3

NUMERICAL STUDIES OF FLUID FLOW IN FLAT, NARROW-GAP CHANNELS SIMULATING PLATE HEAT EXCHANGER

100%

Piepiórka-Stepuk J., Jakubowski M.

Chemical and Process Engineering

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2013

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vol. 34

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issue 4

507-514

EN

The aim of this work was to present the numerical simulation results determining the distributions of flow velocity and pressure in the individual channels of a plate heat exchanger. The simulations have been conducted by means of the Finite Volume Method (FVM) of numerical computation using the ANSYS CFX software. The computational model constituted spaces between 10 flat, straight flow type plates of the heat exchanger. The obtained results of numerical simulations confirm the presence of inhomogeneous flow conditions in the neighbouring channels between the plates. The computations enabled to point out the regions on the plates, in which insufficient flow can result in problems with their cleaning. The results of this work constitute the first part of a research leading to an assessment of cleaning conditions in plate heat exchangers.

4

The suitability of CFD in diagnosis and treatment of laryngeal diseases

100%

Gamrot-Wrzoł M., Marków M., Janecki D., Misiołek M.

Polski Przegląd Otorynolaryngologiczny

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2020

|

vol. 9(2)

23-26

EN

Computational Fluid Dynamics (CFD) is a fluid mechanics department that uses numerical methods to solve fluid flow issues. A review of the literature was done as well to summarize the usage of the CFD method in the assessment of airflow through the upper respiratory tract (GDO), especially in the larynx. CFD is now becoming a very useful tool not only for analyzing airflow patterns and mechanism of particle deposition in the larynx, but also for obtaining information on temperature, pressure and shear stress changes in GDO. It is a tool with which one can safely plan surgical treatment as well as predict its potential effects.

5

Two-dimensional CFD modeling of the heat and mass transfer process during sewage sludge drying in a solar dryer

100%

Krawczyk P., Badyda K.

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6

The thermal-flow behavior of the working chamber in an oil-free scroll compressor

100%

Rak J.

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7

Numerical modeling of CO2 separation process

100%

Rulik S., Remiorz L., Dykas S.

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8

Secondary flows occurring in a whirlpool separator – A study of phenomena – observation, simulation and measurements

100%

Jakubowski M.

Chemical and Process Engineering

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2015

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issue 3

9

Secondary flows occurring in a whirlpool separator – A study of phenomena – observation, simulation and measurements

100%

Jakubowski M.

|

issue 3

277-289

EN

The whirlpool separator, used for hot trub separation, is prevalent in the brewing industry. It is a kind of a hydrocyclone inside of which a tea leaf effect occurs, which is sediment accumulation into a cone shape at the central part of the tank’s bottom. This manner of sediment accumulation is caused by the secondary flow occurring in the so-called Ekman boundary layer. This article is a summary of the research, which has been conducted for many years and involved observation, simulation and experimental research on the recognition and formation of the secondary flow accumulating the sediment cone. Secondary flows occurring in a whirlpool were identified through CFD simulation and PIV experiments, and are presented in this paper. Based on their location and direction, an attempt to determine their impact on the separation process taking place in the whirlpool has been made. The secondary flow identification methods proposed in this paper can be successfully applied in other solutions, e. g. structural ones, which involve rotational-flow-based separation.

10

Two-phase CFD simulation of the monodyspersed suspension hydraulic behaviour in the tank apparatus from a circulatory pipe

100%

Plewik R., Synowiec P., Wójcik J.

Polish Journal of Chemical Technology

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2008

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vol. 10

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issue 1

22-27

EN

The hydrodynamics in fluidized-bed crystallizers is studied by CFD method. The simulations were performed by a commercial packet of computational fluid dynamics Fluent 6.x. For the one-phase modelling (15), a standard k-ε model was applied. In the case of the two-phase flows the Eulerian multi-phase model with a standard k-ε method, aided by the k-ε dispersed model for viscosity, has been used respectively. The collected data put a new light on the suspension flow behaviour in the annular zone of the fluidised bed crystallizer. From the presented here CFD simulations, it clearly issues that the real hydraulic conditions in the fluidised bed crystallizers are far from the ideal ones.

11

NUMERICAL STUDIES OF FLUID FLOW IN FLAT, NARROW-GAP CHANNELS SIMULATING PLATE HEAT EXCHANGER

100%

Piepiórka-Stepuk J., Jakubowski M.

Chemical and Process Engineering

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2013

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issue 4

12

Computational Modelling of a Tangentially Fired Boiler With Deposit Formation Phenomena

100%

Modliński N. J.

Chemical and Process Engineering

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2014

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vol. 35

|

issue 3

361-368

EN

Any complete CFD model of pulverised coal-fired boiler needs to consider ash deposition phenomena. Wall boundary conditions (temperature and emissivity) should be temporally corrected to account for the effects of deposit growth on the combustion conditions. At present voluminous publications concerning ash related problems are available. The current paper presents development of an engineering tool integrating deposit formation models with the CFD code. It was then applied to two tangentially-fired boilers. The developed numerical tool was validated by comparing it with boiler evaporator power variation based on the on-line diagnostic system with the results from the full CFD simulation.

13

Performance comparison of the optimized inverted joined wing airplane concept and classical configuration airplanes

89%

Sieradzki A., Dziubiński A., Galiński C., Sieradzki A., Dziubiński A., Galiński C.

Archive of Mechanical Engineering

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2016

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vol. 63

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issue 3

14

Performance investigation of a double pipe heat exchanger under different flow configuration by using experimental and computational technique

89%

Kannojiya V., Gaur R., Yadav P., Sharma R., Kannojiya V., Gaur R., Yadav P., Sharma R.

Archive of Mechanical Engineering

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2018

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vol. 65

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issue 1

15

Numerical analysis of erosion wear and pressure drop for turbulent multiphase slurry flow

89%

Kannojiya V., Darshan M. B., Chandra Y. P., Kannojiya V., Darshan M. B., Chandra Y. P.

Archive of Mechanical Engineering

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2018

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vol. 65

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issue 3

16

Design and performance analysis of ORC centrifugal pumps

88%

Klimaszewski P., Klonowicz P., Lampart P., Witanowski Ł., Zaniewski D., Jędrzejewski Ł., Suchocki T., Klimaszewski P., Klonowicz P., Lampart P., Witanowski Ł., Zaniewski D., Jędrzejewski Ł., Suchocki T.

Archives of Thermodynamics

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2020

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vol. 41

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issue 4

17

Modelling of a passive autocatalytic hydrogen recombiner – a parametric study

88%

Rożeń A.

Nukleonika

|

2015

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vol. 60

|

issue 1

161-169

EN

Operation of a passive autocatalytic hydrogen recombiner (PAR) has been investigated by means of computational fluid dynamics methods (CFD). The recombiner is a self-active and self-adaptive device used to remove hydrogen from safety containments of light water nuclear reactors (LWR) by means of a highly exothermic reaction with oxygen at the surface of a platinum or palladium catalyst. Different turbulence models (k-ω, k-ɛ, intermittency, RSM) were applied in numerical simulations of: gas flow, heat and mass transport and chemical surface reactions occurring in PAR. Turbulence was found to improve mixing and mass transfer and increase hydrogen recombination rate for high gas flow rates. At low gas flow rates, simulation results converged to those obtained for the limiting case of laminar flow. The large eddy simulation technique (LES) was used to select the best RANS (Reynolds average stress) model. Comparison of simulation results obtained for two- and three-dimensional computational grids showed that heat and mass transfer occurring in PAR were virtually two-dimensional processes. The effect of hydrogen thermal diffusion was also discussed in the context of possible hydrogen ignition inside the recombiner.

18

Energy consumption in terms of shear stress for two types of membrane bioreactors used for municipal wastewater treatment processes

88%

Ratkovich N., Bentzen T. R., Rasmussen M. R.

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19

Application of CFD technique for modelling of the thermoacoustic engine

88%

Rulik S., Remiorz L., Dykas S.

|

20

Fluid flow consideration in fin-tube heat exchanger optimization

88%

Wais P.

Archives of Thermodynamics

|

2010

|

issue 3

Refine search results

Numerical modelling of a microreactor for thermocatalytic decomposition of toxic compounds

Przydatność metody CFD w diagnostyce i leczeniu chorób krtani

NUMERICAL STUDIES OF FLUID FLOW IN FLAT, NARROW-GAP CHANNELS SIMULATING PLATE HEAT EXCHANGER

The suitability of CFD in diagnosis and treatment of laryngeal diseases

Two-dimensional CFD modeling of the heat and mass transfer process during sewage sludge drying in a solar dryer

The thermal-flow behavior of the working chamber in an oil-free scroll compressor

Numerical modeling of CO2 separation process

Secondary flows occurring in a whirlpool separator – A study of phenomena – observation, simulation and measurements

Secondary flows occurring in a whirlpool separator – A study of phenomena – observation, simulation and measurements

Two-phase CFD simulation of the monodyspersed suspension hydraulic behaviour in the tank apparatus from a circulatory pipe

NUMERICAL STUDIES OF FLUID FLOW IN FLAT, NARROW-GAP CHANNELS SIMULATING PLATE HEAT EXCHANGER

Computational Modelling of a Tangentially Fired Boiler With Deposit Formation Phenomena

Performance comparison of the optimized inverted joined wing airplane concept and classical configuration airplanes

Performance investigation of a double pipe heat exchanger under different flow configuration by using experimental and computational technique

Numerical analysis of erosion wear and pressure drop for turbulent multiphase slurry flow

Design and performance analysis of ORC centrifugal pumps

Modelling of a passive autocatalytic hydrogen recombiner – a parametric study

Energy consumption in terms of shear stress for two types of membrane bioreactors used for municipal wastewater treatment processes

Application of CFD technique for modelling of the thermoacoustic engine

Fluid flow consideration in fin-tube heat exchanger optimization