A5038145166- Heat Transfer and Boiling Studies
- Heat Transfer and Optimization
- Fluid Dynamics and Thin Films
- Fluid Dynamics and Mixing
- Refrigeration and Air Conditioning Technologies
- Phase Change Materials Research
- Nuclear Engineering Thermal-Hydraulics
- Metallurgical Processes and Thermodynamics
- Spacecraft and Cryogenic Technologies
- Advanced Sensor Technologies Research
Czech Technical University in Prague
2019-2022
Increasing heat dissipation requirements of small and miniature devices demands advanced cooling methods, such as application immersion via boiling transfer. In this study, functionalized copper surfaces for enhanced transfer are developed evaluated. Samples using a chemical oxidation treatment with subsequent hydrophobization selected fluorinated silane. Pool tests water, water/1-butanol mixture self-rewetting properties novel dielectric fluid low GWP (Novec™ 649) conducted to evaluate the...
The boiling performance of functionalized hybrid aluminum surfaces was experimentally investigated for water and self-rewetting mixtures 1-butanol. Firstly, microstructured were produced via chemical etching in hydrochloric acid the effect time on surface morphology evaluated. An 5 min found to result pitting corrosion weakly hydrophilic with many microcavities. Observed cavity-mouth diameters between 3.6 32 μm are optimal efficient nucleation provided a superior performance. Longer times 10...
ABSTRACTABSTRACTHeat transfer coefficient (HTC) was experimentally measured for saturated and subcooled pool boiling of binary mixtures water glycerin. Saturated studied with mass fractions ωw from 100% to 60% on horizontal flat nickel-plated surfaces at heat fluxes 50 650kWm−2 atmospheric pressure. Subcooled investigated in the range subcooling 0 30K approximately 250, 450 650kWm−2. It found that mixture effects have a significant impact HTC even very low content glycerin as drops were...
Heat transfer coefficients were investigated for saturated nucleate pool boiling of binary mixtures water and glycerin at atmospheric pressure in a wide range concentrations heat fluxes. Mixtures with mass fractions from 100% to 40% boiled on horizontal flat copper surface fluxes about 25 up 270kWm−2. Experiments carried out by static dynamic method measurement. Results the show that impact mixture effects coefficient cannot be neglected ideal has corrected all Experimental data are...
We have designed a simple apparatus for measurement of heat transfer during pool boiling in order to find or create suitable correlations heat-transfer coefficient, which could be used various liquids and conditions. run several testing experiments with tap deionized water. This contribution presents proceedings the first results these as well comparison some published verified correlations.
Heat transfer coefficients and nucleation parameters were experimentally measured during saturated nucleate boiling of water–glycerin mixtures on a thin smooth titanium foil. Infrared thermometry was employed to study at atmospheric pressure in water mass fraction range from 100 % down 60 heat flux 0 200 kW m−2. found deteriorate with an increase concentration glycerin the mixture. The deterioration more pronounced for lower higher fluxes. Bubble departure diameters observed be weakly...
We have designed an apparatus dedicated for measurement of heat transfer coeffcient during saturated nucleate pool boiling. After several performed measurements, we applied three important modifications the motivated by discrepancies between measured and correlated coeffcients. Firstly, cubic stainless-steel heated block no longer accommodates heating cartridges. It now stands on a copper carrier cartridges, which are vertically oriented. Secondly, insulated with plates made cellular glass....