Тип публикации: статья из журнала
Год издания: 2020
Идентификатор DOI: 10.1080/01457632.2020.1766250
Аннотация: The systematic experimental investigation of the viscosity of more than 30 different nanofluids was carried out. The investigated nanofluids were prepared based on distilled water, ethylene glycol and engine oil containing nanoparticles Al2O3, TiO2, ZrO2, CuO, Fe2O3, and Fe3O4, as well as nanodiamonds. The nanoparticle volume conceПоказать полностьюntration ranged from 0.25 to 8%. The size of nanoparticles varied from 5 to 150 nm. The temperature changed from 25 to 60 degrees C. The effect of the nanoparticle concentration and size, as well as the base liquid properties, temperature, and additives of stabilizing surfactants on the viscosity of nanofluids were investigated. In particular, the factors affecting the rheology of nanofluids were studied. It was found that the viscosity of nanofluids depends on the material of the nanoparticles. It is shown that with decreasing nanoparticle size, the viscosity of nanofluids increases. In contrast to the classical microscopic suspensions, the relative viscosity of nanofluid depends on the viscosity of the base liquid. In general, the higher is the viscosity of the base fluid, the higher is the increment of the nanofluid viscosity. It was found, that the rheological behavior of the Newtonian nanofluid can become non-Newtonian with the growth of the volume fraction of nanoparticles and decrease of their size. At very high nanoparticle concentration the relative viscosity of nanofluid depends on temperature and characterized by hysteresis, i.e. the viscosity of nanofluid during heating and cooling differs significantly.
Журнал: HEAT TRANSFER ENGINEERING
Выпуск журнала: Vol. 42, Is. 12
Номера страниц: 1024-1040
ISSN журнала: 01457632
Место издания: PHILADELPHIA
Издатель: TAYLOR & FRANCIS INC