A5026876561- Heat Transfer and Boiling Studies
- Fluid Dynamics and Mixing
- Fluid Dynamics and Heat Transfer
- Nuclear Engineering Thermal-Hydraulics
- Complex Systems and Time Series Analysis
- Image and Signal Denoising Methods
- Power Transformer Diagnostics and Insulation
- Metal and Thin Film Mechanics
- Innovative Microfluidic and Catalytic Techniques Innovation
- Currency Recognition and Detection
- Metallurgical Processes and Thermodynamics
- Heat Transfer and Optimization
- Nonlinear Dynamics and Pattern Formation
- Tribology and Wear Analysis
- Lubricants and Their Additives
Bialystok University of Technology
2020-2024
Abstract The synchronization between the air pressure fluctuations and depth of liquid penetration into nozzle during bubble departures was investigated using joint recurrence quantification analysis. In experiment, bubbles were generated from a glass distilled water. During analysis, recurrent rate coefficients calculated for changes in gas supply system. study conducted by two volume flow rates, i.e. 0.023 l/min 0.026 l/min. rates selected so that appearance disappearance period clearly...
In this paper, the boiling synchronization of two-phase flow patterns in two parallel minichannels 1 mm diameter with connected compressible volumes was analyzed. The analysis performed using images recorded a high-speed camera. degree between channels evaluated by assessing presence liquid small part minichannels. It can be concluded that is synchronized when bubble or wavy annular occur neighboring channels. occurrence slug one channel causes to become unsynchronized. result image shows...
Though numerous analytical techniques are used to assess performance of surface-modified metals, identification dominant wear modes, as well transitions between them, is challenging. Nevertheless, the works devoted analysis COF oscillations still scarce. In this paper, Recurrence Quantification Analysis, Principal Component Analysis and Self-Organizing Map neural network proposed tools for time series acquired during tribological tests non-coated DLC-coated Ti6Al4V. The approach can be...
During flow boiling in a system with small (mini/micro) channels, several instabilities may occur at the same time, which overlap each other such phenomenon complicates analysis of dynamics. The above mentioned processes cause that fluctuation recorded signals on various time scales. Although many criteria for stability two-phase flows are available, their practical application is limited (they need parameter two phase flow). Methods we looking should allow pattern identification based...
Abstract In the paper, flow boiling in three parallel minichannels with a common inlet and outlet area was examined. The synchronization between distributions analyzed local (image analysis) as process of pressure fluctuations. These processes were studied using cross recurrence plot. analysis pixel brightness changes inside has been applied to identify similarity patterns minichannels. results have revealed that negative impact on water temperature oscillations. During high amplitude...
In the paper, a self-organizing map combined with recurrence quantification analysis was used to identify flow boiling patterns in circular horizontal minichannel an inner diameter of 1 mm. The dynamics pressure drop during density-wave oscillations single cycle were considered. It has been shown that proposed algorithm allows us distinguish five types non-stationary two-phase patterns, such as bubble flow, confined wavy annular liquid and slug flow. pattern identification confirmed by...
Abstract The two-phase flow patterns (air–water) in horizontal square minichannel (3 × 3 mm) has been analysed. multifractal analysis of pressure drop fluctuations was used for qualitative assessment patterns. results the complexity using spectral width ( Δh ) are presented. proposed method allows us to identify following patterns: micro-bubbles flow, micro- and minibubbles mini-bubbles with confined bubbles slug stratified flow. obtained confirm that this type can be considered as an...
In the paper, numerical methods of data analysis recurrence quantification (RQA) and self-organizing map (SOM) have been used to analyse pressure drop oscillations during flow boiling in minichannel. The performed allows us identify patterns based on character oscillations. following two-phase identified: liquid flow, with small vapour bubble, slug long confined bubble flow. experiment, open-loop system a circular horizontal minichannel an inner diameter 1 mm was investigated. at outlet...