Thermal conductivity measurements of nanofluids

Тип публикации: статья из журнала

Год издания: 2017

Идентификатор DOI: 10.1016/j.ijheatmasstransfer.2016.09.080

Ключевые слова: Thermal conductivity coefficient, Nanofluid, Nanoparticles, Hot-wire method, PARTICLE-SIZE, HEAT-TRANSFER, LASER IRRADIATION, DEPENDENCE

Аннотация: The paper presents the results of systematic measurements of the thermal conductivity coefficient of nanofluids at room temperature. In total, more than fifty various nanofluids based on water, ethylene glycol, and engine oil containing particles of SiO2, Al2O3, TiO2, ZrO2, CuO, and diamond were studied. The nanoparticles volume concentration ranged from 0.25 to 8% and the particles size ranged from 10 to 150 nm. It is shown that the thermal conductivity of nanofluids is not described by the classical theories (Maxwell's and so forth). The nanofluid thermal conductivity coefficient is a complicated function not only of the particle concentration, but also the particles size, their material, and type of base fluid. Measured thermal conductivity coefficients almost always exceed the values calculated by the Maxwell's formula, though nanofluids with sufficiently small particles may have thermal conductivity coefficients even lower than those predicted by the Maxwell theory. However, in all cases, the nanofluid thermal conductivity coefficient enhances with increasing particle size. It is convincingly shown that there is no direct correlation between the thermal conductivity of the nanoparticle material and the thermal conductivity of nanofluid containing these particles. The base liquid also significantly influences the effective thermal conductivity of the nanofluid. It has been confirmed that the lower the thermal conductivity of the base fluid, the higher the relative thermal conductivity coefficient of the nanofluid. (C) 2016 Elsevier Ltd. All rights reserved.

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Издание

Журнал: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER

Выпуск журнала: Vol. 104

Номера страниц: 1275-1282

ISSN журнала: 00179310

Место издания: OXFORD

Издатель: PERGAMON-ELSEVIER SCIENCE LTD

Авторы

  • Pryazhnikov M.I. (Siberian Fed Univ, Krasnoyarsk, Russia; Novosibirsk State Univ Architecture & Civil Engn, Novosibirsk, Russia)
  • Minakov A.V. (Siberian Fed Univ, Krasnoyarsk, Russia; Novosibirsk State Univ Architecture & Civil Engn, Novosibirsk, Russia; SB RAS, Kutateladze Inst Thermophys, Novosibirsk, Russia)
  • Rudyak V.Ya. (Siberian Fed Univ, Krasnoyarsk, Russia; Novosibirsk State Univ Architecture & Civil Engn, Novosibirsk, Russia)
  • Guzei D.V. (Novosibirsk State Univ Architecture & Civil Engn, Novosibirsk, Russia)

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