Stability of nanofluid: A review

Thermal management and temperature uniformity enhancement of electronic devices by micro heat sinks: A review

Flow and heat transfer characteristics in smooth, sinusoidal and zigzag-shaped microchannel with and without nanofluid have been investigated by finite volume method. Effects of amplitude and wave length of sinusoidal and zigzag-shaped microchannel, volume of fraction and Reynolds number on heat transfer, performance evaluation criterion were evaluated. The results show that by increasing volume fraction of Copper oxide nanoparticle, Nusselt numbers are increased. Obtained results show that if only the increase in heat transfer is considered, using sinusoidal microchannels without nanoparticles is more effective method than using of nanoparticles in smooth microchannels. By analyzing the effect of wavelength and amplitude on changes of Nusselt number, it can be found that by decreasing sinusoidal and zigzag-shaped microchannel wavelengths, Nusselt number will increase. Also, we concluded that for selection of the best microchannel, the zigzag shaped one is a more appropriate one as compared to the sinusoidal microchannel.

Numerical investigation of flow and heat transfer characteristics in smooth, sinusoidal and zigzag-shaped microchannel with and without nanofluid

The present study comprises experimental investigation on heat transfer and hydrodynamic characteristics of TiO2 nanofluid as coolant in wavy channel heat sinks having three different channel configurations. The performance of TiO2 nanofluids having concentrations of 0.006, 0.008, 0.01 and 0.012 vol% is compared with that of distilled water under laminar regime at heating powers of 25 W, 35 W and 45 W. Results indicated that for all heat sinks, nanofluids showed better heat transfer characteristics than distilled water. With an increase in heating power, TiO2 nanofluid thermal performance was decreased. Using 0.012% TiO2 nanofluids, minimum wall base temperature and maximum enhancement in Nusselt number are noted as 33.85 °C and 40.57%, respectively, for heat sink with wavelength of 5 mm and amplitude of 0.5 mm corresponding to Reynolds number of 894 at heating power of 25 W. Pumping power requirement is function of flow rate and pressure drop, and its maximum value of 0.0284 W is associated with heat sink with minimum wavelength. Moreover, variation in wavelength of channel is found to have dominating effect on heat transfer performance of heat sink as compared to the width of channel.

Experimental investigation of TiO 2 –water nanofluid flow and heat transfer inside wavy mini-channel heat sinks

Heat transfer fluids are a crucial parameter that affects the size and costs of heat exchangers However, the available coolants like water and oils have low thermal conductivities, which put many limitations to the development of heat transfer to achieve high performance cooling The need for development of new classes of fluids which enhance the heat transfer capabilities attracted the attention of many researchers In the last few decades, modern nanotechnology developed nanoparticles, which have unique thermal and electrical properties that could help improve heat transfer using nanofluids A “nanofluid” is a fluid with suspended fine nanoparticles which increases the heat transfer properties compared with the original fluid Nanofluids are considered a new generation of heat transfer fluids and are considered two-phase fluids of liquid solid mixtures The efficiency of the fluid could be improved by enhancing its thermal properties, especially the thermal conductivity, and it is expected that the nanofluids will have a greater thermal conductivity than the base fluids This paper reviews the preparation of metallic and nonmetallic nanofluids along with the stability of the produced nanofluids Physical and thermal properties as well as a range of applications are also discussed in detail

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O. Sartipzadeh

Papers

Experimental study on cooling performance of sinusoidal–wavy minichannel heat sink

An experimental study on vortex-generator insert with different arrangements of delta-winglets

Thermal–hydraulic performance of wavy plate-fin heat exchanger using passive techniques: Perforations, winglets, and nanofluids

Effects of different pin-fin interruptions on performance of a nanofluid-cooled zigzag miniature heat sink (MHS)

Experimental and parametric studies on a miniature heat sink with offset-strip pins and Al2O3/water nanofluids