Convective Heat Transfer in Heat Exchangers Using Nanofluids: A Review

Reddy, Goda Sreenivasulu; Kalaivanan, Ramasamy; Kumar, Rampelli Uday; Varma, K.P.V. Krishna

doi:10.12912/27197050/147679

Ecol. Eng. Environ. Technol.

2022

DOI: 10.12912/27197050/147679

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Convective Heat Transfer in Heat Exchangers Using Nanofluids: A Review

Goda Sreenivasulu Reddy¹,

Ramasamy Kalaivanan²,

Rampelli Uday Kumar³

et al.

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Thermophysical properties of TiO ₂ /CuO hybrid nanofluids for heat transfer applications

Mande,

Rama Raju,

Varma

2023

Materials Research Innovations

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Thermophysical properties of TiO ₂ /CuO hybrid nanofluids for heat transfer applications

Mande,

Rama Raju,

Varma

2023

Materials Research Innovations

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Influence of MWCNT/ZnO hybrid nanofluids’ thermo-physical characteristics for heat transfer applications

Maheshbabu,

Ramkrishnan,

Krishna Varma

2024

Proceedings of the Institution of Mechanical Engineers, Part N:

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Hybrid nanofluids (HNF’s) can perform as promising heat transfer fluids because of their enhanced thermo-physical characteristics. However, there are certain limitations of using them at higher concentrations. Moreover, lot of works on hybrid nanofluids focussed greatly on assessing thermal conductivity and viscosity. But the other parameters like specific heat and density also play an important role in heat transfer applications in addition to the volume concentration. Also, the effect of the combination of different nano particles on heat transfer is also a crucial area. Hence in this work, it is aimed to determine the thermo-physical characteristics of MWCNT/ZnO hybrid nanofluids (70:30) at varied loading and temperatures. Two step strategy was employed to prepare the (HNF’s) at distinct loadings varying in the range of 0.01%–0.05% and at a range of temperatures of 30°C–70°C with base fluid as water. The mixture’s ratios were 30:70 of MWCNT and ZnO, respectively. HNF’s exhibited an improved thermal conductivity in comparison to the original fluid, which was 80% more than the base fluid. With the rise in the temperature, the density, viscosity and specific heat all trended downward. There is an increase in the density and viscosity with the increase in the volume concentration of the hybrid nano particles. This work suggested that the MWCNT and ZnO hybrid nanofluids are better heat transfer fluids for enhancing the heat transfer and can emerge as efficient coolants for the applications of heat transfer.

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Effects of cadmium doping on thermo-physical properties of ZnO nanoparticles and nanofluids for heat transfer applications

Siva Krishna,

Prasad,

Krishna Varma

2024

Proceedings of the Institution of Mechanical Engineers, Part N:

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The most common method of improving the thermal performance of the conventional fluids is adding the solid particles to the base fluid. This even though increases the thermal conductivity, but in turn increases the viscosity and the risk of sedimentation. Hence alternative methods are required to enhance the thermal performance of the base fluids. One such promising method is doping. In this regard, in this work it is aimed to study the effects of cadmium doping ZnO nanoparticles, which were then analyzed using X-ray Diffraction (XRD), Energy Dispersive X-ray (EDX), and Scanning Electron Microscopy (SEM). Their elemental composition was determined using SEM. XRD was utilized to ascertain the average size of the crystallite. All particles were found to be spherical and the average particle size ranged from 17 to 20 nm. Their thermal features were determined for various temperatures (20°C–60°C) and concentrations (0.1%–0.3%). Outcomes depict that at the highest concentration of the doped ZnO NPs, the thermal conductivity (TC) of the cadmium doped ZnO NFs for the concentration of 0.05% has enhanced by 42% than the base fluid. The TC of the Cadmium doped NFs was also found to be 7% higher than the TC of pure ZnO NFs. Density and viscosity has showed an increasing trend with the rise in the loading of the nanoparticles(NPs) whereas the specific heat has decreased. Doped nanofluids outperformed the ZnO nanofluids in their properties.

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Convective Heat Transfer in Heat Exchangers Using Nanofluids: A Review

Cited by 3 publications

References 0 publications

Thermophysical properties of TiO ₂ /CuO hybrid nanofluids for heat transfer applications

Thermophysical properties of TiO ₂ /CuO hybrid nanofluids for heat transfer applications

Influence of MWCNT/ZnO hybrid nanofluids’ thermo-physical characteristics for heat transfer applications

Effects of cadmium doping on thermo-physical properties of ZnO nanoparticles and nanofluids for heat transfer applications

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Convective Heat Transfer in Heat Exchangers Using Nanofluids: A Review

Cited by 3 publications

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Thermophysical properties of TiO 2 /CuO hybrid nanofluids for heat transfer applications

Thermophysical properties of TiO 2 /CuO hybrid nanofluids for heat transfer applications

Influence of MWCNT/ZnO hybrid nanofluids’ thermo-physical characteristics for heat transfer applications

Effects of cadmium doping on thermo-physical properties of ZnO nanoparticles and nanofluids for heat transfer applications

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Thermophysical properties of TiO ₂ /CuO hybrid nanofluids for heat transfer applications

Thermophysical properties of TiO ₂ /CuO hybrid nanofluids for heat transfer applications