A5001014287- Hydraulic and Pneumatic Systems
- Rheology and Fluid Dynamics Studies
- Cavitation Phenomena in Pumps
- Tribology and Lubrication Engineering
- Atmospheric chemistry and aerosols
- Cyclone Separators and Fluid Dynamics
- Flow Measurement and Analysis
- Oil and Gas Production Techniques
- Wind and Air Flow Studies
- Vehicle emissions and performance
- Heat Transfer Mechanisms
- Fluid Dynamics and Vibration Analysis
- Engine and Fuel Emissions
- Nanofluid Flow and Heat Transfer
- Combustion and Detonation Processes
- Modeling, Simulation, and Optimization
- Industrial and Mining Safety
- Engineering Technology and Methodologies
- Air Quality Monitoring and Forecasting
- Plasma and Flow Control in Aerodynamics
- Atmospheric and Environmental Gas Dynamics
- Risk and Safety Analysis
- Advanced Sensor and Energy Harvesting Materials
- Innovative Energy Harvesting Technologies
- Vibration and Dynamic Analysis
VSB - Technical University of Ostrava
2005-2023
Faculty (United Kingdom)
2021
Norsk Hydro (Germany)
2011
Brno University of Technology
2011
Czech Academy of Sciences, J. Heyrovský Institute of Physical Chemistry
2009
Université de Lille
2009
Centre National de la Recherche Scientifique
2009
The distribution of pollutants in two urban scale models (point emission source and street canyon with extensive transport) was investigated by means CO 2 laser photoacoustic spectroscopy the region atmospheric window (9–10 μm). experimental results physical modeling are a good agreement numerical calculations performed frame computational fluid dynamic (CFD) modeling. Methanol, ethanol, ozone (examples light pollutants), as well sulfur hexafluoride 1,2 dichlorethane heavy were selected on...
This article is aimed to define the flow in annulus. The shaft deposited a case which has at inlet and outlet recess. rotor moves case. movement can be divided into rotation precession. It situation where rotates around own axis together along circle. solution of problem was initiative practice this type occurs many components, e.g. sliding journal bearings. fluid flows annulus due pressure gradient between takes place rotational rotor. Between liquid solid an interaction results change...
Computational fluid dynamic (CFD) modelling of pollution dispersion and chemical conversion to aerosol particles in the atmospheric boundary layer (ABL) has been studied. The investigation focused on numerical above complex orographic terrains urban areas industrial sites including toxic substances air as a result accidents. A finite-rate model reactions, turbulence chemistry for reaction between nitric acid ammonia, applied. As supporting experiments, online monitoring spatial distribution...
The hydraulic circuit, through which the mineral oil is brought, an important part of hydrostatic bearings. annular thrust bearing consists two sliding plates divided by a layer oil. In lower plate, there are grooves distribute liquid between areas. circuit made basic parts: energy source and controlling part. pump, brings into bearing, pressure energy. weighted down axial force, can be changed during process. That´s why in front particular control components adjusting flow size located....
The systems with fluidic oscillators are intensively studied nowadays because the oscillatory flow can increase heat and mass transfer decrease energy dissipation. Fluidic produce an active-type mixing enhancement but in a passive manner as they do not require any moving parts. They convert steady pressurized inlet to or pulsatile at outlet without need for external power. In general, there many types of oscillators, categorized by underlying mechanism create output behaviour. oscillator...
The effective and reliable performance of any pump can be significantly impacted by the piping system design. One essential points is suction pipe. Poor design dimension lead to cavitation in which affects its head efficiency. primary objective reduce hydraulic losses order maintain a Net Positive Suction Head required pump. recommended short straight, branch connections, valves elbows should avoided, not always possible. In addition, occur actual elements installed on suction. This work...
In this paper the study of laminar flow in a pipe with slip boundary is presented.The influence partial surface wetting on shear and velocity profile as well pressure drop has been investigated numerically.Steady, isothermal, incompressible was modelled 2D 3D geometry.Wall condition modified through user defined function to account for wettability based theory proposed by Pochylý [1-10].The results obtained numerical modelling Fluent were compared theoretical assumptions. AbstraktČlánek...
The twin-screw pump is designed for pumping highly viscous materials in the food industry. Rheological characteristics of are important specification design parameters screw pumps. Analysis flow pumps with definition non-newtonian can be made by numerical modelling. CFD generally oriented software ANSYS Fluent and Polyflow has been used In this study those software’s (ANSYS Polyflow) were defined solution Results compared same boundary conditions on inlet outlet 3D model. For viscosity...
Twin-screw pumps employ clearances between both screws and screw rotors housing, which cause backflow as function of pressure differential. Reduction this flow can be reached by proper geometry design. For the experimental investigation, scaled model 1:2 section was produced with trapezoidal tooth profile in two modifications differing width pitch. Measurement characteristics non-rotating twin-screw carried out for validation possible corrections 3D CFD model. The testing done non-Newtonian...
Twin screw pump is a positive displacement pump, which widely used in numerous type of foodstuff applications. Numerical CFD analysis presented this paper focuses on the investigation influence clearances and non-Newtonian behaviour fluid. The operates at low rotational speed inlet pressure. As first step 3D simulation twin-screw non-rotating segment has been carried out using static mesh without rotation. Various empirical equations have applied to represent viscosity relations for fluid...
The influence of the partial surface wetting on flow field between two coaxial cylinders, inner which rotates, has been investigated numerically.Wall boundary condition was modified to account for wettability based equation proposed by Pochylý general curved [1-10].FLUENT software applied model stationary viscous fluid in a narrow gap.Different conditions were rotating wall cylinder.The results obtained numerical modelling compared with theoretical assumptions.
This paper deals with the numerical modelling of flow in single-stage centrifugal pump.The main objective is to determine pump performance characteristics using two different geometriesthe first one consisting only inlet part, impeller and volute, second including also casing, i.e. gaps on both sides impeller.Both stationary time dependent problems were solved obtain data for comparison experimental measurement.The influence geometry reduction was evaluated advantages limitations approaches depicted.
This paper deals with the fluid flow in axial hydrostatic bearing central groove.The type of narrow gap is defined by dimensionless Reynolds number.The influence groove shape on pressure field investigated.Numerical modelling and evaluation parameters done using Ansys Fluent software.
This paper deals with the numerical modelling of flow in single-stage centrifugal pump.The main objective is to determine leakage losses through annular seals at suction side pump.Leakage a shaft seal not included simulation.The amount liquid that circulates from impeller discharge back pump determined dependence on rate.Losses are further discussed as well possibility their prediction.
The energy efficiency of systems, equipment, and sensors is nowadays intensively studied. new generation microelectronic very sophisticated the consumption in microwatts range. to power devices can be harvested from oscillating flow small size channels so replaceable batteries could eliminated. Piezoelectric elements convert oscillation electrical energy. This paper focuses on simulation periodic fluidic oscillator. CFD simulations were performed for several values rate. Experimental...