Enhancement of Heat Transfer Using Fe3O4 / Water Nanofluid with Varying Cut-Radius Twisted Tape Inserts

Varma, K. P. V. Krishna; Kishore, P.S.; Prasad, P.V. Durga

doi:10.37622/ijaer/12.18.2017.7088-7095

Cited by 28 publications

(6 citation statements)

References 12 publications

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“…The rate of heat transfer was found to be enhanced by 22-25% at 0.1% volume concentration and by 25-30% at 0.2% volume concentration. By employing a nanofluid of Fe 3 O 4 , Krishna et al [69], using Fe 3 O 4 water-based nanofluid, conducted an experimental examination of twisted tape inserts with different cut-radii in hairpin heat exchangers. Data from experiments were produced at mass flow rates between 0.05 kg/s to 0.25 kg/s and at Reynolds numbers within 3,000 to 25,000, wherein the hot fluid in the annulus was kept moving at a constant pace of 0.1 For several particle volume concentrations between 0.011% and 0.031%, performance analysis required calculating the heat transfer coefficient and related friction factors.…”

Section: Experimental Studies On Used Nanofluidsmentioning

confidence: 99%

Impact of Nano Additives in Heat Exchangers with Twisted Tapes and Rings to Increase Efficiency: A Review

Assaf,

Akroot,

Abdul Wahhab

et al. 2023

Sustainability

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The heat exchanger is crucial to all systems and applications that use it. Researchers are primarily focused on improving this component’s thermal conductivity to improve its efficiency. This was achieved by using one or more of the following strategies: inserting tapes with various shapes and numbers, inserting rings of various shapes and spacing between each, and transforming a basic liquid into a nanoliquid by adding nanomaterials with high conductivity and ultra-small particle sizes. Different types of nanomaterials were added in varying concentrations. In earlier studies, it was found that every increase in heat transfer was accompanied by a pressure drop at both ends of the exchanger. The amount of heat transferred and the pressure drop are affected by many factors, such as the torsion tape ratio, the pitch of the ring, and whether the pitch faces the direction of flow or not. Heat transfer rates can also be impacted by factors such as the length and angle of the wings, how many rings and tapes there are, and whether the rings and tapes contain holes or wings. In addition, the Reynolds number, the type, conductivity, and size of nanomaterials, and the base fluid used in the nanofluid affect this. It is possible for the shape of the exchanger tube, as well as varying rates of rise, to introduce such impacts. In this study, the factors, costs, and benefits of using any technology to increase the efficiency of the heat exchanger are reviewed so that the user can make an informed decision about the technology to use.

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Section: Experimental Studies On Used Nanofluidsmentioning

confidence: 99%

Impact of Nano Additives in Heat Exchangers with Twisted Tapes and Rings to Increase Efficiency: A Review

Assaf,

Akroot,

Abdul Wahhab

et al. 2023

Sustainability

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“…The density and specific heat of the Fe 3 O 4 nanofluid used in this study can be expressed by Equations ( 1) and ( 2) [49].…”

Section: Data Reductionmentioning

confidence: 99%

Effect of Magnetic Field on the Forced Convective Heat Transfer of Water–Ethylene Glycol-Based Fe3O4 and Fe3O4–MWCNT Nanofluids

2021

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This paper discusses the forced convective heat transfer characteristics of water–ethylene glycol (EG)-based Fe3O4 nanofluid and Fe3O4–MWCNT hybrid nanofluid under the effect of a magnetic field. The results indicated that the convective heat transfer coefficient of magnetic nanofluids increased with an increase in the strength of the magnetic field. When the magnetic field strength was varied from 0 to 750 G, the maximum convective heat transfer coefficients were observed for the 0.2 wt% Fe3O4 and 0.1 wt% Fe3O4–MWNCT nanofluids, and the improvements were approximately 2.78% and 3.23%, respectively. The average pressure drops for 0.2 wt% Fe3O4 and 0.2 wt% Fe3O4–MWNCT nanofluids increased by about 4.73% and 5.23%, respectively. Owing to the extensive aggregation of nanoparticles by the external magnetic field, the heat transfer coefficient of the 0.1 wt% Fe3O4–MWNCT hybrid nanofluid was 5% higher than that of the 0.2 wt% Fe3O4 nanofluid. Therefore, the convective heat transfer can be enhanced by the dispersion stability of the nanoparticles and optimization of the magnetic field strength.

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“…Out of the listed 31 studies in Table 3, twelve studies are related to heat transfer augmentation techniques involving Nanofluids. 70,72,75,76,78,83,86,88–92 Researchers used nano materials like Al 2 O 3 , Fe 3 O 4 , Ag, TiO 2, PG -CuO etc., in small volume concentrations to disperse in base fluids and to prepare the nanofluids. Nanofluids, colloidal suspension of nano-particles in base fluids, possess high level of energy transmission potential due to their enhanced thermo-physical properties and Brownian motion of nanoparticles within the fluid.…”

Section: Review Of Energy-efficient Heat Exchangers and Test Fluidsmentioning

confidence: 99%

Design and testing of energy-efficient heat exchangers for Newtonian and non-Newtonian fluids – A review

Jayesh

Mukkamala

John

2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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Heat transfer enhancement, pumping power and weight minimization in enhanced heat exchangers has long been achieved by deploying tubes with internal surface modifications like microgrooves, ribs, fins, knurls, and dimples with and without tube inserts. This article presents a very extensive review of experimental and computational studies on heat transfer enhancement, which covers convectional and unconventional working fluids under different fluid flow conditions. Compound augmentation with tube surface modifications and inserts has yielded enhancements in the overall heat transfer coefficient of over 116% in the fully developed turbulent flow regime. Exotic fluids like nano-coolants deployed in spiral grooved mircofin tubes yielded 196% enhancement in tube side heat transfer rate for concentrations as low as 0.5% by volume, while the thermal efficiency index measuring the overall enhancement in relation to the pumping power was 75%. However, reviews that address the combined effect of unconventional fluids, surface modifications and tube inserts on the overall thermo-hydraulic performance of annular heat exchangers seem to be limited. Further, nano-coolants aren’t frequently used in the process industry. The goal of this study is to document and evaluate the impact of cost-effective and energy-saving passive enhancement techniques such as tube surface modifications, tube inserts, and annular enhancement techniques on annular heat exchangers used in the process industries with Newtonian and non-Newtonian fluids. This review should be useful to engineers, academics and medical professionals working with non-Newtonian fluids and enhanced heat exchangers.

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Enhancement of Heat Transfer Using Fe3O4 / Water Nanofluid with Varying Cut-Radius Twisted Tape Inserts

Cited by 28 publications

References 12 publications

Impact of Nano Additives in Heat Exchangers with Twisted Tapes and Rings to Increase Efficiency: A Review

Impact of Nano Additives in Heat Exchangers with Twisted Tapes and Rings to Increase Efficiency: A Review

Effect of Magnetic Field on the Forced Convective Heat Transfer of Water–Ethylene Glycol-Based Fe3O4 and Fe3O4–MWCNT Nanofluids

Design and testing of energy-efficient heat exchangers for Newtonian and non-Newtonian fluids – A review

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