A new correlation for predicting the thermal conductivity of ZnO–Ag (50%–50%)/water hybrid nanofluid: An experimental study
| Autor: | Davood Toghraie, Masoud Afrand, Navid Nasajpour Esfahani |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
020209 energy General Chemical Engineering Thermodynamics chemistry.chemical_element 02 engineering and technology Ultrasonic device Zinc Low volume Nanofluid Thermal conductivity chemistry Volume fraction 0202 electrical engineering electronic engineering information engineering Brownian motion |
| Zdroj: | Powder Technology. 323:367-373 |
| ISSN: | 0032-5910 |
| Popis: | In this paper, a two-stage method, along with an ultrasonic device, a magnetic mixture, and acidity control technique were used to produce ZnO-Ag/water nanofluid and the test results, along with results from data analysis are presented by diagrams and tables. The effect of volume fraction (0.125–2%) and temperature (25–50 °C) on thermal conductivity of nanofluid was examined on thermal conductivity of a hybrid nanofluid, i.e. zinc oxide‑silver ZnO–Ag (50%–50%), is presented in a diagram. At the end, a model was proposed for calculating thermal conductivity of the nanofluid, based on existing data. The results show that since Brownian motion increases with raising temperature, an increase in volume fraction at higher temperatures has a greater role in increasing thermal conductivity. In low volume fractions, temperature has a weaker effect on thermal conductivity. We found that the highest relative thermal conductivity was observed in volume fraction of 2% at 50 °C. Also, according to the obtained results, the margin of deviation is equal to 1.3%. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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