Effect of nanofluid concentration and composition on laminar jet impinged cooling of heated steel plate

• Laminar jet impinged cooling of hot steel plate using TiO2, Al2O3 and SiO2 nanofluids.
• Effects of concentration, jet velocity and nanoparticle composition studied experimentally.
• Enhancement in heat transfer is obtained using nanofluid jets compared to water.
• Increase in concentration of TiO2 nanoparticles in nanofluid leads to an increase in CHF.
• Nanofluids with same concentration and different compositions show similar cooling rates.

In this paper, an experimental investigation of heated steel surface cooled by laminar nanofluid jets and its comparison with water jets are presented. The effects of concentration and jet velocity of TiO2 based nanofluid on cooling rate are evaluated experimentally. Further, the cooling rates of TiO2, Al2O3, and SiO2 nanofluids with same concentration and velocity are compared. The total heat flux is deduced from the experimentally obtained cooling curves by using a one-dimensional finite volume method based transient inverse heat transfer model. It is found that heat transfer is enhanced using nanofluid jets when compared to water. Increase in concentration of TiO2 nanoparticle in nanofluid leads to an increase in CHF. Further, it is also observed that the shift from film boiling to transition boiling is faster for nanofluid jet cooled surface.

Graphical AbstractFigure optionsDownload as PowerPoint slide