Numerical Investigations on Heat Transfer Characteristics of Single Particle and Hybrid Nanofluids in Uniformly Heated Tube

Garud, Kunal Sandip; Lee, Moo‐Yeon

doi:10.3390/sym13050876

Cited by 37 publications

(6 citation statements)

References 44 publications

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“…Commonly-used models from published research literature have been utilised to estimate the thermophysical characteristics of single-particle and hybrid nanofluids [8,9]. The volume fraction is expressed as follows [8,10]:…”

Section: Properties Of Single Particle Nanofluidmentioning

confidence: 99%

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Numerical Study of Heat Transfer Enhancement with Nanofluid in Rectangular Duct.

Ray

2023

Preprint

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In order to reduce heat losses and enhance heat transfer efficiency, energy conservation and management in thermal systems has attracted interest on a global scale. Due to limitations on continuous improvement in thermophysical characteristics of traditional working fluids, R&D trends have shifted towards nanofluids applications in heat transfer systems. Literature review substantiates that single-particle nano fluids are wellsuited for heat transfer applications. Employing hybrid nanofluids to improve heat transfer rates is a comparably new field of research and application.. In the present numerical study, enhancement of heat transfer rates is observed for flows of single-particle and hybrid nanofluids through a rectangular, straight duct of uniform crosssection, subjected to symmetrical and uniform wall heat flux conditions. The present work is carried out to investigate heat transfer augmentation characteristics of hybrid nanofluids and single-particle nanofluids, for different nanoparticle mixture ratios dispersed in water. The simulations are performed with 0.5%, 1.0% and 2.0% volume fractions of nano particles. The Reynolds number of flow is varied from 2000 to 12000. The uniform heat flux applied along the tube length is ≈ 7955 W/m 2 . The effects of Reynolds number, volume fraction, and composition of nanoparticles are analysed from the perspective of fluid and thermal analysis. The validation of the results obtained from present study has been performed with experimental and published data available in open literature. The wall-averaged Nusselt number and the pressure drop rise as the Reynolds number and the volume fraction is increased. This warrants a trade-off between heat transfer enhancement on one hand, and mechanical head losses on the other. The heat transfer characteristics of the chosen water-dispersed, hybrid nanofluid is also observed to be superior as compared to the single-particle nanofluid medium.

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Section: Properties Of Single Particle Nanofluidmentioning

confidence: 99%

“…( 11)-( 14) is the pressure field and the specific enthalpy. The turbulence model has also been incorporated in the numerical analysis in line with [8]. Here are the turbulent kinetic energy and turbulent dissipation rates respectively.…”

Section: Problem Description and Mathematical Modelmentioning

confidence: 99%

Numerical Study of Heat Transfer Enhancement with Nanofluid in Rectangular Duct.

Ray

2023

Preprint

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“…The equations of the specific heat capacity, density, thermal conductivity, thermal expansion, and electrical conductivity of Cu and TiO 2 nanoparticles, respectively, were obtained from [63,64] and can be calculated as follows:…”

Section: Properties Of the Hybrid Nano-fluidmentioning

confidence: 99%

MHD Flow of a Hybrid Nano-Fluid in a Triangular Enclosure with Zigzags and an Elliptic Obstacle

2022

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The current study uses the multi-physics COMSOL software and the Darcy–Brinkman–Forchheimer model with a porosity of ε = 0.4 to conduct a numerical study on heat transfer by Cu-TiO2/EG hybrid nano-fluid inside a porous annulus between a zigzagged triangle and different cylinders and under the influence of an inclined magnetic field. The effect of numerous factors is detailed, including Rayleigh number (103 ≤ Ra ≤ 106), Hartmann number (0 ≤ Ha ≤ 100), volume percent of the nano-fluid (0.02 ≤ ϕ ≤ 0.08), and the rotating speed of the cylinder (−4000 ≤ w ≤ 4000). Except for the Hartmann number, which decelerates the flow rate, each of these parameters has a positive impact on the thermal transmission rate.

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“…The thermal conductivities of different base fluids and nanoparticles are presented in Figure 4 [32]. The drawback of nanofluid is higher viscosity, which results in higher pumping power compared to conventional cooling fluids [34]. The nanofluids are prepared using single-step and two-step methods [35].…”

Section: Nanofluidmentioning

confidence: 99%

Review on Performance Enhancement of Photovoltaic/Thermal–Thermoelectric Generator Systems with Nanofluid Cooling

et al. 2021

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Photovoltaics (PVs) are an effective technology to harvest the solar energy and satisfy the increasing global electricity demand. The effectiveness and life span of PVs could be enhanced by enabling effective thermal management. The conversion efficiency and surface temperature of PVs have an inverse relationship, and hence the cooling of PVs as an emerging body of work needs to have attention paid to it. The integration of a thermoelectric generator (TEG) to PVs is one of the widely applied thermal management techniques to improve the performance of PVs as well as combined systems. The TEG utilizes the waste heat of PVs and generate the additional electric power output. The nanofluid enables superior thermal properties compared to that of conventional cooling fluids, and therefore the performance of photovoltaic/thermal–thermoelectric generator (PV/T-TEG) systems with nanofluid cooling is further enhanced compared to that of conventional cooling. The TEG enables a symmetrical temperature difference with a hot side due to the heat from PVs, and a cold side due to the nanofluid cooling. Therefore, the symmetrical thermal management system, by integrating the PV/T, TEG, and nanofluid cooling, has been widely adopted in recent times. The present review comprehensively summarizes various experimental, numerical, and theoretical research works conducted on PV/T-TEG systems with nanofluid cooling. The research studies on PV/T-TEG systems with nanofluid cooling were reviewed, focusing on the time span of 2015–2021. This review elaborates the various approaches and advancement in techniques adopted to enhance the performance of PV/T-TEG systems with nanofluid cooling. The application of TEG with nanofluid cooling in the thermal management of PVs is an emerging research area; therefore, this comprehensive review can be considered as a reference for future development and innovations.

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Numerical Investigations on Heat Transfer Characteristics of Single Particle and Hybrid Nanofluids in Uniformly Heated Tube

Cited by 37 publications

References 44 publications

Numerical Study of Heat Transfer Enhancement with Nanofluid in Rectangular Duct.

Numerical Study of Heat Transfer Enhancement with Nanofluid in Rectangular Duct.

MHD Flow of a Hybrid Nano-Fluid in a Triangular Enclosure with Zigzags and an Elliptic Obstacle

Review on Performance Enhancement of Photovoltaic/Thermal–Thermoelectric Generator Systems with Nanofluid Cooling

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