Nanofluids are colloidal mixtures of nanometric metallic or ceramic particles in a base fluid, such as water, ethylene glycol or oil. Nanofluids possess immense potential to enhance the heat transfer character of the original fluid due to improved thermal transport properties. In this article, a brief overview has been presented to address the unique features of nanofluids, such as their preparation, heat transfer mechanisms, conduction and convection heat transfer enhancement, etc. In addition, the article summarizes the experimental and theoretical work on pool boiling in nanofluids and their applications

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ZnO–Al2O3 and ZnO–Fe2O3 with different loadings of ZnO (5–20 wt%) along with ZnAl2O4 and ZnFe2O4 were prepared and tested in the transesterification of sunflower, waste cooking oil and Jatropha oil.

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