The recent development of nanotechnology led to the concept of using suspended nanoparticles in heat transfer fluids to improve the heat transfer coefficient of the base fluids. Specifically, numerical studies are reviewed in this study to get a clear view and detailed summary of the influence of several parameters such as type of nanoparticle and host liquid, particle volume concentration, particle size, particle shape, Brownian diffusion and thermophoresis effect on hydrodynamic and thermal characteristics of convective heat transfer using nanofluids. In addition, the paper provides detailed information about the most of commonly-used correlations which are utilized to predict the effective thermophysical properties of nanofluids. Finally, the main aim upon which the present work is based is to give a comprehensive review on different CFD approaches employed in numerical simulation of nanofluid flow, address the pros and cons of each approach, and find the suitable technique which gives more credible results as compared to experimental results.

Numerical study of convective heat transfer of nanofluids: A review

Recent research contributions concerning use of nanofluids in heat exchangers: A critical review

The field of nanofluids has received interesting attention since the concept of dispersing nanoscaled particles into a fluid was first introduced in the later part of the twentieth century This is evident from the increased number of studies related to nanofluids published annually The increasing attention on nanofluids is primarily due to their enhanced thermophysical properties and their ability to be incorporated into a wide range of thermal applications ranging from enhancing the effectiveness of heat exchangers used in industries to solar energy harvesting for renewable energy production Owing to the increasing number of studies relating to nanofluids, there is a need for a holistic review of the progress and steps taken in 2019 concerning their application in heat transfer devices This review takes a retrospective look at the year 2019 by reviewing the progress made in the area of nanofluids preparation and the applications of nanofluids in various heat transfer devices such as solar collectors, heat exchangers, refrigeration systems, radiators, thermal storage systems and electronic cooling This review aims to update readers on recent progress while also highlighting the challenges and future of nanofluids as the next-generation heat transfer fluids Finally, a conclusion on the merits and demerits of nanofluids is presented along with recommendations for future studies that would mobilise the rapid commercialisation of nanofluids

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An updated review of nanofluids in various heat transfer devices

Applications of nanofluids containing carbon nanotubes in solar energy systems: A review

Recent advances on the fundamental physical phenomena behind stability, dynamic motion, thermophysical properties, heat transport, applications, and challenges of nanofluids

Experimental investigation on convective heat transfer and pressure drop of cone helically coiled tube heat exchanger using carbon nanotubes/water nanofluids

In this experimental investigation, the heat transfer and pressure drop analysis of a shell and helically coiled tube heat exchanger by using Al2O3 / water nanofluids have been carried out under turbulent flow condition. The Al2O3/ water nanofluids of 0.1%, 0.4%, and 0.8% particle volume concentration have been prepared by using two step method. The tube side experimental Nusselt number of 0.1%, 0.4% and 0.8% nanofluids were found to be 28%, 36% and 56%, respectively higher than water. These enhancements are due to higher thermal conductivity of nanofluid, better fluid mixing and strong secondary flow formation in coiled tube. The pressure drop of 0.1%, 0.4% and 0.8% were found to be 4%, 6%, and 9%, respectively higher than water. The increase in pressure drop is due to increase in nanofluid viscosity while adding nanoparticles. The measurement of nanofluid thermal performance factor is found to be greater than unity. It is concluded that the Al2O3 nanofluid can be applied as a coolant in helically coiled tube heat exchanger to enhance heat transfer with negligible pressure drop.

Heat transfer enhancement and pressure drop analysis in a helically coiled tube using Al2O3 / water nanofluid

CFD analysis on heat and flow characteristics of double helically coiled tube heat exchanger handling MWCNT/water nanofluids

Numerical study on heat transfer performance using Al2O3/water nanofluids in six circular channel heat sink for electronic chip

In this investigation, the heat transfer coefficient and pressure drop of a helically coiled tube heat exchanger handling Al2O3/ water nanofluids is made by using computational fluid dynamics fluent (CFD) software package. This was done under laminar flow condition in the Dean number (De) range of 1650–2650 and the nanoparticles volume concentration of 0.1%, 0.4% and 0.8%. The effect of some important parameters such as nanoparticle volume concentration and Dean number (De) on heat transfer and pressure drop is studied. The coiled tube side Nusselt number (Nu) is found to be 30% higher than water at maximum De. The maximum pressure drop is found to be 9% higher than water. It is also found that the Nu and pressure drop significantly increase with increasing particle volume concentration and De. It is also found that the experimental friction factor increases with increasing the particle volume concentration and De. The CFD Nu and pressure drop results have been compared with the experimental and theoretical results. On comparison, it is found that the CFD simulation results show good agreement with the experimental and theoretical results. It is concluded that the CFD approach gives good prediction for heat transfer coefficient and pressure drop in a shell and helically coiled tube heat exchanger using Al2O3/ water nanofluids. The average relative error between experimental Nu, pressure drop results and CFD results are found to be 8.5% and 9.5% respectively.

P.C. Mukesh Kumar

Papers

Experimental investigation on convective heat transfer and pressure drop of cone helically coiled tube heat exchanger using carbon nanotubes/water nanofluids

Heat transfer enhancement and pressure drop analysis in a helically coiled tube using Al2O3 / water nanofluid

CFD analysis on heat and flow characteristics of double helically coiled tube heat exchanger handling MWCNT/water nanofluids

Numerical study on heat transfer performance using Al2O3/water nanofluids in six circular channel heat sink for electronic chip

CFD analysis of heat transfer and pressure drop in helically coiled heat exchangers using Al2O3 / water nanofluid