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International Journal of Energy for a Clean Environment
SJR: 0.195 SNIP: 0.659 CiteScore™: 1.2

ISSN Imprimir: 2150-3621
ISSN On-line: 2150-363X

International Journal of Energy for a Clean Environment

Anteriormente Conhecido Como Clean Air: International Journal on Energy for a Clean Environment

DOI: 10.1615/InterJEnerCleanEnv.2014006801
pages 151-168

STUDY OF A HEAT TRANSFER MECHANISM AND CRITICAL HEAT FLUX AT NANOFLUIDS BOILING

Boris I. Bondarenko
Gas Institute of the National Academy of Sciences of Ukraine, 39 Degtyarivska St., 03113 Kiev, Ukraine
V. N. Moraru
Gas Institute of NAS of Ukraine, 39 Degtyarivska St., 03113 Kyiv, Ukraine
Boris K. Ilienko
Gas Institute of the National Academy of Sciences of Ukraine, 39 Degtyarivska St., 03113 Kiev, Ukraine
Alexander I. Khovavko
Gas Institute of NAS of Ukraine, 39 Degtyarivska St., 03113 Kyiv, Ukraine
D. V. Komysh
Gas Institute of NAS of Ukraine, 39 Degtyarivska St., 03113 Kyiv, Ukraine
E. M. Panov
National Technical University of Ukraine "KPI", 37/19 Av. Peremogy, 03056, Kyiv, Ukraine
S. V. Sydorenko
National Technical University of Ukraine "KPI", 37/19 Av. Peremogy, 03056, Kyiv, Ukraine
O. V. Snigur
Gas Institute of NAS of Ukraine, 39 Degtyarivska St., 03113 Kyiv, Ukraine

RESUMO

In view of the extreme importance of an effective cooling of power equipment, as confirmed by accidents that have taken place in nuclear reactors, development of nanofluids and study of their properties, intensity of heat transfer, including boiling crisis, are very important today. For this purpose, test units for pool boiling of nanofluids investigation were constructed. A nichrome wire at alternating current has been used as a heating source. Nichrome resistivity depends on a temperature. This fact is taken as a basis of the heater's temperature determination. All measurements, data collection, and calculations of the parameters (current, voltage, critical heat flux, heat transfer coefficient, etc.) were performed by a computer and developed software data acquisition and processing system in real time. Simultaneously graphical relationships were built that specified the above variables and parameters. The obtained results allowed some conclusions to be made about essential increase of a specific heat flux that defines the boiling crisis for a number of nanofluids, influence of initial concentrations of nanoparticles in liquids, presence of dispersants, nature of nanoparticles and regimes of a fluid flow on a boiling crisis, and a heat transfer coefficient. There were preliminary conclusions also made concerning possible mechanism of nanoparticle influence on a heat transfer at nanofluids boiling.


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