The use of additives in the base fluid like water or ethylene glycol is one of the techniques applied to augment the heat transfer. Recently innovative nanometer sized particles had been dispersed in the base fluid in heat transfer fluids. The fluids containing the solid nanometer size particle dispersion are called “nanofluids.” Two main categories were discussed in detail: the single-phase modeling in which the combination of nanoparticle and base fluid is considered as a single-phase mixture with steady properties and the two-phase modeling in which the nanoparticle properties and behaviors are considered separately from the base fluid properties and behaviors. Moreover, nanofluid flow and heat transfer can be studied in the presence of thermal radiation, electric field, magnetic field, and porous media. Furthermore, several numerical and semianalytical methods can be used to simulate nanofluid hydrothermal behavior. In this chapter, definition of nanofluid and its application have been presented.
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