What is it about?
Nanofluids exhibit superior heat transfer characteristics and great energy saving. The nanofluids were prepared by dispersing TiO2 nanoparticles in distilled water base fluid. The thermal conductivity of nanofluids was measured using a modified transient hot-wire method and was measured at different nanofluids volume fractions (0.03%, 0.06%, 0.12%, 0.23%, 0.35% and 0.47%) and temperature ranges from 10oC to 90oC. The results showed that the thermal conductivity increased with increasing the nanoparticle concentrations and temperature. The maximum enhancement of thermal conductivity is 37.35 % at ananofluid temperature of 90oC and volume fraction of 0.47% while it is 24.11% at a nanofluid temperature of 20oC for the same volume fraction.
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Why is it important?
The thermal conductivity of the nanofluid remarkably increases with increasing the volume fraction. The thermal conductivity enhancement ratio increases with increasing the nanofluid temperature.
Perspectives
Titanium dioxide has superior chemical and physical stability due to very small volume fraction that can give a great dispersion of nanofluid. Moreover, it is cheap and commercially available. No considerable studies have been done for TiO2/water nanofluid in the temperature range from 10oC to 90oC at low volume fraction from 0.03% to 0.47%. We have conducted our experimental measurements for TiO2/ water nanofluid as a heat transfer medium to enhance the heat transfer of cooling water at the specified range of temperature and volume fraction.
Salem AbdelSamad
Egyptian Atomic Energy Authority
Read the Original
This page is a summary of: Experimental Investigation of TiO2-water Nanofluids Thermal Conductivity Synthesized by Sol-gel Technique, Current Nanoscience, October 2017, Bentham Science Publishers,
DOI: 10.2174/1573413713666170619124221.
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