Browsing EÚ-odbor termomechaniky a techniky prostředí by Title
Now showing items 1-20 of 20
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An accuracy analysis of the front tracking method and interface capturing methods for the solution of heat transfer problems with phase changes
(IOP Publishing, 2016-06-19)Materials undergoing a phase change have a number of applications in practice and engineering. Computer simulation tools are often used for investigation of such heat transfer problems with phase changes since they are ... -
Air–liquid interactions in a pressure-swirl spray
(Elsevier, 2018-01-02)The energy transfer between a liquid hollow cone spray and the surrounding air has been studied using both imaging and phase-Doppler techniques. The spray was produced by a pressure-swirl atomizer discharging Jet A-1 fuel ... -
Comparison of turbulent models in the case of a constricted tube
(EDP Sciences, 2016-11-15)The validation of a proper solution is an indispensable phase of every numerical simulation. Nowadays, many turbulent models are available, whose application leads to slightly different solution of flow behaviour depending ... -
Effect of nanoparticles concentration on the characteristics of nanofluid sprays for cooling applications
(Springer, 2019-03-01)This study addresses the effect of nanofluid synthesis on the rheological properties of the resulting fluid and their consequent effect on the characteristics (size and velocity distribution of droplets, spray cone angle, ... -
Experimental verification of boundary conditions for numerical simulation of airflow in a benchmark ventilation channel
(EDP Sciences, 2016-03-28)Correct definition of boundary conditions is crucial for the appropriate simulation of a flow. It is a common practice that simulation of sufficiently long upstream entrance section is performed instead of experimental ... -
High Quality Steel Casting by Using Advanced Mathematical Methods
(MDPI, 2018-12-04)The main concept of this paper is to utilize advanced numerical modelling techniques with self-regulation algorithm in order to reach optimal casting conditions for real-time casting control. Fully 3-D macro-solidification ... -
Influence of operating conditions and atomizer design on circumferential liquid distribution from small pressure-swirl atomizer
(EDP Sciences, 2017-05-12)The spray symmetry is an important aspect in most practical applications. However, it is often an overlooked parameter. A measurement of circumferential distribution was carried out by a circular-sectored vessel on several ... -
The influence of spill-line geometry on a spray generated by a pressure-swirl atomizer
(EDP Sciences, 2016-03-28)An experimental investigation of characteristics of spray generated by a pressure-swirl atomizer (spill-return type) was performed using shadowgraphy and Phase-Doppler Anemometry (PDA). Several different geometries of the ... -
Internal flow and air core dynamics in Simplex and Spill-return pressure-swirl atomizers
(Elsevier, 2018-08-01)Spill-return (SR) atomizers enhance the construction of Simplex atomizers by addition of a passage in the rear wall of the swirl chamber through which the liquid can be spilled away. It allows to discharge the liquid always ... -
Internal flow characteristics in Spill-return pressure-swirl atomizers
(ILASS, 2019-09-04)The spray produced by pressure-swirl atomizers strongly depends on the character of their internal flow. Flow field inside a swirl chamber of small pressure-swirl spill-return atomizers was examined using high-speed imaging ... -
Investigation of pressure swirl sprays using Volumetric PIV
(ILASS, 2019-09-04)The volumetric measurement technique (V3V-Flex©) was used to investigate the spray generated by two pressure swirl atomizers (PSAs). Both a simplex pressure swirl atomizer and a spill-return pressure swirl atomizer were ... -
Laminar-turbulent transition in a constricted tube: Comparison of Reynolds-averaged Navier–Stokes turbulence models and large eddy simulation with experiments
(SAGE Journals, 2019-05-27)Constricted tubes appear in many engineering as well as biological systems such as blood vessels or pulmonary airways. The aim of this article is to test the ability of different turbulence models to predict the flow field ... -
Measurement of an electronic cigarette aerosol size distribution during a puff
(EDP SCIENCES, 2017-05-12)Electronic cigarettes (e-cigarettes) have become very popular recently because they are marketed as a healthier alternative to tobacco smoking and as a useful tool to smoking cessation. E-cigarettes use a heating element ... -
Optimal design of structure in rheological models: an automotive application to dampers with high viscosity silicone fluids
(JVE International, 2017-10-09)Dynamic torsional vibration dampers are for a long time inherent integral components of internal combustion engines. One of the most common types of the dynamic dampers is a silicone damper. It has been, for many years, ... -
Performance of Twin-Fluid Atomizers for Atomization of Viscous Solutions
(EDP Sciences, 2014-11-18)The article compares the performace of two twin-fluid atomizers with different desing and fluid mixing principles for atomiyation of viscous liquids. -
Prediction of localized aerosol deposition in a realistic replica of human airways using experimental data and numerical simulation
(EDP Sciences, 2016-11-15)The presence of aerosol deposition hot-spots in human airways presumably contributes to development of various diseases. The overall aerosol deposition in human lungs can be predicted with sufficient accuracy nowadays. ... -
Simulation of Airway Deposition of an Aerosol Drug in COPD Patients
(MDPI, 2019-04-01)Medical aerosols are key elements of current chronic obstructive pulmonary disease (COPD) therapy. Therapeutic effects are conditioned by the delivery of the right amount of medication to the right place within the airways, ... -
Spray characteristics and liquid distribution of multi-hole effervescent atomisers for industrial burners
(Elsevier, 2016-03-05)The present paper provides an experimental study and optimization of multi-hole effervescent atomizers for industrial burners using oil-based fossil, bio- or waste fuels with prospects of emission reduction. Several ... -
Study of airflow in the trachea of idealized model of human tracheobronchial airways during breathing cycle
(EDP Sciences, 2014-11-18)Article deals with numerical simulations and its verification by experiments in trachea of idealized geometry of tracheobronchial airways by using unsteady RANS approach. Respiratory cycle was simulated by sinusoidal ... -
Twin-fluid atomization of viscous liquids: The effect of atomizer construction on breakup process, spray stability and droplet size
(Elsevier, 2015-08-25)This study focuses on the low-pressure spraying of viscous liquids ( = 60, 147 and 308 mPa s) using four types of internal-mixing twin-fluid atomizers.