A5007343781- Heat Transfer and Boiling Studies
- Heat Transfer and Optimization
- Protein purification and stability
- Fluid Dynamics and Heat Transfer
- Fluid Dynamics and Thin Films
- Microfluidic and Capillary Electrophoresis Applications
- Granular flow and fluidized beds
- Analytical Chemistry and Chromatography
- Photonic and Optical Devices
- Microencapsulation and Drying Processes
- Electrohydrodynamics and Fluid Dynamics
- Aerosol Filtration and Electrostatic Precipitation
- Advanced Chemical Sensor Technologies
- Refrigeration and Air Conditioning Technologies
- Spacecraft and Cryogenic Technologies
- Advanced Control Systems Optimization
- Microbial Inactivation Methods
- Fault Detection and Control Systems
- Biofuel production and bioconversion
- Cyclone Separators and Fluid Dynamics
- Innovative Microfluidic and Catalytic Techniques Innovation
- Advanced Fiber Optic Sensors
- Plant Surface Properties and Treatments
- Gas Sensing Nanomaterials and Sensors
- Mechanical and Optical Resonators
Fondazione Bruno Kessler
2022-2024
University of Ljubljana
2011-2022
ABSTRACTBoiling instabilities, high temperatures of the onset boiling (ONB), and early transition to dryout are some insufficiently resolved issues flow in microchannels. This article addresses challenges with incorporation restrictors reduce instabilities hinder vapor backflows. In addition, temperature ONB was lowered heat transfer coefficient increased during fabrication potential nucleation cavities microchannel walls bottom. Experiments were conducted degassed double-distilled water...
Free space optics laser communication using modulating retroreflectors (MR) is a challenging application for an active mirror, due to the high frequencies (>100 kHz) required enable sufficient data transfer. Micro Electromechanical (MEMS) mirrors are promising option high-frequency applications, given very small moving mass typical of such devices. Capacitive MEMS presented here free communications, based on novel fabrication sequence that introduces single-layer thin film aluminum mirror...
The lyophilization of lactose and mannitol aqueous solutions was investigated with an emphasis on analyzing the effects controlled nucleation, temperature pore size distribution freeze-drying process. experimental procedure involved depressurization technique in-vial measurements as well chamber pressure, which allowed analysis product batch, loaded in laboratory lyophilizator. average enlargement 93 58% incorporation nucleation step 6 wt% solutions, respectively. Consequently, primary...
The paper reports on the development of a numerical model for simulation lyophilization process in vial. Lactose and mannitol-water mixtures are used as working media. Experimental analysis dynamics inside single vial laboratory scale lyophilizer is reported, with main focus primary drying phase. In order to assess kinetics, temperature distribution along vertical axis samples measured. model, one-dimensional (1D) approximation used, governing equations heat water vapor transport moving...
The currently available microchannel fabrication techniques ranging from various etching methods and micro electrical discharge machining to laser microfabrication have some apparent advantages weaknesses when compared one another. Manufacturing process should satisfy several important criteria: diversity of the working material, minimal fabricated feature size, capability 3D structuring, precision surface quality, maximum aspect ratio, production costs, etc. This study focuses on combining...
The temperature of the sensing material has a large impact on tin-oxide gas sensor performance. However, thermal analysis sensors is often overlooked or only partially included in studies. aim this research was to employ numerical simulations investigate effect detection ethanol an ethanol/air mixture by positioning multiple electrodes single heated membrane. experimental results validated electrothermal simulation and indicated significant responsivity. Indeed, decrease average from 427 °C...
The comparative experimental analysis of flow boiling pure water and four different self-rewetting fluids (6% butanol, 2% pentanol, 0.6% hexanol 0.15% heptanol aqueous solution) was performed in an array interconnected 50×50 μm microchannels. results show that the onset postponed to higher surface superheats when SRFs were used instead water. In addition, visualization showed a substantially more abrupt unstable flow, which observed as misty two-phase microchannel array. Both occurrences are...
The purpose of this study was to investigate the droplet size obtained with a three-channel spray nozzle typically used in fluid bed devices and construct semi-empirical model for prediction size. With aid custom-made optical method concept, impact type polymer solvents through dispersion properties (viscosity, density, surface tension), flow rate, atomization pressure, microclimate pressure on investigated. A adequate predictability calculating average (R2 = 0.90, Q2 0.73) its distribution...
Flow boiling of degassed double-distilled water in a single 50 × μm and 100 microchannel was investigated on the basis experimental measurements high-speed visualization. The visualized events during were analyzed terms bubble frequencies front oscillations microchannels. A digital image sequence analysis algorithm composed to determine time dependence meniscus locations. results show (i) dynamic characteristics microchannels, (ii) increase fundamental oscillation with increasing heat flux...
The necessity of measuring permeability is encountered in number applications and some them have adequate measurement techniques available. However, the fields freeze drying, composite scaffolds, 3D printed materials, etc., sample materials unique shapes sizes, which disables use standardized equipment. Hence, a novel method was developed to determine material by analyzing high frequency unsteady state pressure acquired during permeation working fluid. also suitable for in-line measurements...