Thermal conductivity enhancement of SiO2–MWCNT (85:15 %)–EG hybrid nanofluids

Esfe, Mohammad Hemmat; Behbahani, Pouyan Mohseni; Arani, Ali Akbar Abbasian; Sarlak, Mohammad Reza

doi:10.1007/s10973-016-5893-9

Cited by 150 publications

(11 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the temperature was kept constant, the improvement in the thermal conductivity of MWCNT-CuO/water hybrid nanofluids varies from 9.61 to 30.38%. Similar trends were found in a study by Hemmat Esfe et al [113] for the thermal conductivity of SiO2-MWCNT/EG hybrid nanofluids. The thermal conductivity of the hybrid nanofluids increased with the concentrations.…”

Section: Effect Of Particle Concentrationssupporting

confidence: 90%

Recent Progress on Stability and Thermo-Physical Properties of Mono and Hybrid towards Green Nanofluids

Zainon

Azmi

2021

Micromachines

View full text Add to dashboard Cite

Many studies have shown the remarkable enhancement of thermo-physical properties with the addition of a small quantity of nanoparticles into conventional fluids. However, the long-term stability of the nanofluids, which plays a significant role in enhancing these properties, is hard to achieve, thus limiting the performance of the heat transfer fluids in practical applications. The present paper attempts to highlight various approaches used by researchers in improving and evaluating the stability of thermal fluids and thoroughly explores various factors that contribute to the enhancement of the thermo-physical properties of mono, hybrid, and green nanofluids. There are various methods to maintain the stability of nanofluids, but this paper particularly focuses on the sonication process, pH modification, and the use of surfactant. In addition, the common techniques to evaluate the stability of nanofluids are undertaken by using visual observation, TEM, FESEM, XRD, zeta potential analysis, and UV-Vis spectroscopy. Prior investigations revealed that the type of nanoparticle, particle volume concentration, size and shape of particles, temperature, and base fluids highly influence the thermo-physical properties of nanofluids. In conclusion, this paper summarized the findings and strategies to enhance the stability and factors affecting the thermal conductivity and dynamic viscosity of mono and hybrid of nanofluids towards green nanofluids.

show abstract

Section: Effect Of Particle Concentrationssupporting

confidence: 90%

Recent Progress on Stability and Thermo-Physical Properties of Mono and Hybrid towards Green Nanofluids

Zainon

Azmi

2021

Micromachines

View full text Add to dashboard Cite

show abstract

“…The readers can refer to several papers such as Refs. [93][94][95][96][97][98][99][100][101][102][103][104] on the thermal conductivity of EG-based nanofluids and Refs. [105][106][107][108][109][110][111][112][113] on the thermal conductivity of water based nanofluids, as well as comprehensive reviews such as Refs.…”

Section: Experimental Based Correlationsmentioning

confidence: 99%

Recent advances in modeling and simulation of nanofluid flows-Part I: Fundamentals and theory

et al. 2019

View full text Add to dashboard Cite

It has been more than two decades since the discovery of nanofluids-mixtures of common liquids and solid nanoparticles less than 100 nm in size. As a type of colloidal suspension, nanofluids are typically employed as heat transfer fluids due to their favorable thermal and fluid properties. There have been numerous numerical studies of nanofluids in recent years (more than 1000 in both 2016 and 2017, based on Scopus statistics). Due to the small size and large numbers of nanoparticles that interact with the surrounding fluid in nanofluid flows, it has been a major challenge to capture both the macro-scale and the nano-scale effects of these systems without incurring extraordinarily high computational costs.To help understand the state of the art in modeling nanofluids and to discuss the challenges that remain in this field, the present article reviews the latest developments in modeling of nanofluid flows and heat transfer with an emphasis on 3D simulations. In part I, a brief overview of nanofluids (fabrication, applications, and their achievable thermo-physical properties) will be presented first.Next, various forces that exist in particulate flows such as drag, lift (Magnus and Saffman), Brownian, thermophoretic, van der Waals, and electrostatic double layer forces and their significance in nanofluid flows are discussed. Afterwards, the main models used to calculate the thermophysical properties of nanofluids are reviewed. This will be followed with the description of the main physical models presented for nanofluid flows and heat transfer, from single-phase to Eulerian and Lagrangian two-phase models. In part II, various computational fluid dynamics (CFD) techniques will be presented. Next, the latest studies on 3D simulation of nanofluid flow in various regimes and configurations are reviewed. The present review is expected to be helpful for researchers working on numerical simulation of nanofluids and also for scholars who work on experimental aspects of nanofluids to understand the underlying physical phenomena occurring during their experiments.

show abstract

“…Research on increasing the thermal conductivity for MWCNT-SiO 2 nanoparticle hybrid with a volume percentage of 1.94 vol. % with ethylene glycol as a base fluid has been carried out by [18] increasing heat transfer by 22.2 %. While research on hybrid nanofluid used in radiators has been carried using aluminum oxide doped with silicon carbide (Al 2 O 3 -SiCM) at a percentage of 0.8 % using a mixed base fluid of distilled water (DW) and ethylene glycol (EG) (50:50) increased the heat transfer coefficient by 28.34 % [19].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

The effect of hybrid nanofluid CuO-TiO2 on radiator performance

Sudarmadji

Irawan

Susilo

2022

EEJET

View full text Add to dashboard Cite

This study aims to improve the performance of the vehicle's cooling system called the radiator, which is part of increasing energy efficiency. Research has been done to investigate the convective heat transfer of hybrid nanofluid, using CuO and TiO2 nanoparticles and water-ethylene glycol (RC) as base fluids on a radiator. The mass concentration of the hybrid nanoparticles varied from 0.25 %, 0.30 %, and 0.35 %. For the preparation of the hybrid nanofluid through a two-step method, by mixing dry samples of CuO and TiO2 nanoparticles (50:50) and then the mixture of radiator coolant, RC (60 % water and 40 % ethylene glycol). The fluid flow varies from 20 liters per minute to 28 liters per minute. Temperature variations range from 70 °C to 90 °C by using controlled heating. Four thermocouples measure the inlet and outlet hot fluid flow and the airflow before and after the radiator. The experiment showed that the overall heat transfer coefficient increases remarkably with the increase of the hybrid nanoparticle concentration under various flow rate values. The maximum overall heat transfer coefficient increases by about 83 % compared to pure radiator coolant under 0.35 % mass concentration at a flow rate of 22 liters per minute and a temperature of 70 °C. It has also been found that the heat transfer rate is highly dependent on the radiator's mass fraction and flow rate. Increasing the mass concentration shows maximum enhancement in heat transfer rate. Inlet temperature also enhances the heat transfer rate, but its effect is small compared to nanofluid's mass concentration and flow rate. This study reveals that hybrid nanofluids can be suitable as a working fluid, especially in small-scale heat transfer devices.

show abstract

Thermal conductivity enhancement of SiO2–MWCNT (85:15 %)–EG hybrid nanofluids

Cited by 150 publications

References 42 publications

Recent Progress on Stability and Thermo-Physical Properties of Mono and Hybrid towards Green Nanofluids

Recent Progress on Stability and Thermo-Physical Properties of Mono and Hybrid towards Green Nanofluids

Recent advances in modeling and simulation of nanofluid flows-Part I: Fundamentals and theory

The effect of hybrid nanofluid CuO-TiO2 on radiator performance

Contact Info

Product

Resources

About