Advances of nanofluids in heat exchangers—A review

Abstract

Recently, many researchers have focused on their studies on the analysis of nanofluid flows due to their participation in the enhancement of heat transfer rates in industrial processes. The ordinary fluids, such as water, mineral oils, and so on, are known for their low thermal conductivity in heat transfer processes. A significant enhancement in the thermal properties of ordinary fluid may be obtained by adding nanoparticles having a diameter of less than 100 nm or suspension of fibers. Better spreading, wetting, dispersion, and stability and with acceptable viscosity are the main advantageous properties of nanofluids on a solid surface. The nanofluids are encountered in various thermal engineering systems such as in heat exchangers, refrigeration, thermal management of fuel cells, cooling of nuclear reactors, microelectromechanical systems, and others. In particular, the thermal conversion is known as a great application of nanotechnology, and many studies have been achieved with such fluids in heat exchangers. Therefore, this paper aims to present a global insight into the different applications of nanofluids in various heat exchangers, that is, heat pipe and plate-fin heat exchangers. All research works have been summarized into three main parts: laminar, transition, and turbulent nanofluid flow regimes.

Study of Laminar Naturel Convection in Partially Porous Cavity in the Presence of Nanofluids

“…This improvement is more significant in the case of Da = 10 -2 . These results agree well with the literature [41][42][43].…”

Blended Ag nanofluids with optimized optical properties to regulate the performance of PV/T systems

“…Zhang et al reviewed the cooling technologies of PV modules, including fluid medium cooling, structural configuration cooling and PCMs cooling, and they reported that nanofluids cooling can be regarded as a preferred cooling method, due to efficient heat transfer ability (Zhang et al, 2020a). Research group of Professor Menni has carried out a large number of studies, from the view of enhanced heat transfer of nanofluids (Menni et al, 2020;Menni et al, 2019b). They have proved that the physical properties, particle size, concentration and flow rate of nanofluids were key factors to enhance the heat transfer of fluids (Younes Menni et al, 2019b).…”

Enhanced Heat Transfer by Oil/Multi-Walled Carbon Nano-Tubes Nanofluid

“…The results obtained show a slight thermal enhancement due to the decrease in the thermal-conductivity of such conventional fluids. Some other studies resorted to increasing thermal-conductivity by adding nanoscale solid particles capable of excessively absorbing thermal-energy from hot walls [1][2][3]. In such contributions, researchers found enhanced thermal-transport over channels under the presence of aerobic or aqueous fluids.…”