Rok 2021

• Numerical simulation of natural convection of Glycol-Al2O3 nanofluids from a horizontal cylinder

  Publikacja

  • D. Sawicka
  • A. Baars
  • J. Cieśliński
  • S. Smoleń

  - HEAT TRANSFER ENGINEERING - Rok 2021

  This paper deals with natural convection around a circular cylinder with constant heat flux in a cavity using computational fluid dynamics. As fluids ethylene glycol and a mixture of ethylene glycol with Al2O3 nanoparticles (mass concentrations of nanoparticles: 0.1% and 1%) are chosen. Rayleigh number ranges from 3104 to 3105. The nanofluids are modeled with single-phase approach. For the investigated range of nanoparticle concentration, the...

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Rok 2020

• A Comparison of Empirical Correlations of Viscosity and Thermal Conductivity of Water-Ethylene Glycol-Al2O3 Nanofluids

  Publikacja

  • D. Sawicka
  • J. Cieśliński
  • S. Smoleń

  - Nanomaterials - Rok 2020

  Because of their superb thermal conductivity, nanofluids are seen as new generation of cooling mediums in many engineering applications. It is well established that even a small amount of nanoparticles mixed with a base fluid may result in distinct thermal conductivity enhancement. On the other hand, addition of nanoparticles to the base fluid results in its substantial viscosity increase. Therefore, it is very dicult to evaluate...

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Rok 2016

• Experimental investigation of free convection of glycol-Al2O3 nanofluid from horizontal tube

  Publikacja

  • J. Cieśliński
  • S. Smoleń
  • D. Sawicka

  - Rok 2016

  Nanofluids came to be seen as a new generation of coolants, both in single- and two phase systems. Furthermore, nanofluids or nanocomposites may be used as a media in a thermal energy storage (TES) in such systems as sensible heat storage (SHS) and phase change materials (PCM). In the SHS systems the dominating mechanism of the heat transfer is natural convection. However, in the literature only a few investigations of free convection...

• EXPERIMENTAL INVESTIGATION OF FREE CONVECTION OF GLYCOL-Al2O3 NANOFLUID FROM HORIZONTAL TUBE

  Publikacja

  • J. Cieśliński
  • S. Smoleń
  • D. Sawicka

  - Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika - Rok 2016

  Nanofluids came to be seen as a new generation of coolants, both in single- and two phase systems. Furthermore, nanofluids or nanocomposites may be used as a media in a thermal energy storage (TES) in such systems as sensible heat storage (SHS) and phase change materials (PCM). In the SHS systems the dominating mechanism of the heat transfer is natural convection. However, in the literature only a few investigations of free convection...

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• Numerical modeling of the combustion in a lab-scale pulverized-coal fired combustion chamber

  Publikacja

  • K. Ronewicz
  • D. Sawicka
  • J. Cieśliński
  • S. Smoleń

  - Applied Mechanics and Materials - Rok 2016

  This work presents results of numerical modeling of the combustion process inside a lab-scale drop-tube chamber, designed to investigate the slagging properties of the flue ashes, created through the solid fuel firing. Interaction between turbulence and chemistry is accounted by use of probability density function (PDF). FLUENT inputs for non-premixed combustion chemistry modeling are defined. A discrete second phase of the coal...

Rok 2015

• Numerical modeling of the combustion in a lab-scale pulverized-coal fired combustion chamber

  Publikacja

  • K. Ronewicz
  • D. Sawicka
  • J. Cieśliński
  • S. Smoleń

  - Rok 2015

  This work presents results of numerical modeling of the combustion process inside a lab-scale drop-tube chamber, designed to investigate the slagging properties of the flue ashes, created through the solid fuel firing. Interaction between turbulence and chemistry is accounted by use of probability density function (PDF). FLUENT inputs for non-premixed combustion chemistry modeling are defined. A discrete second phase of the coal...