Heat transfer and fluid flow characteristics of the passive method in double tube heat exchangers: A critical review

Tavousi, Ebrahim; Perera, Noel; Flynn, Damian; Hasan, Reaz

doi:10.1016/j.ijft.2023.100282

Cited by 53 publications

(9 citation statements)

References 190 publications

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“…Heat exchanger design often employs turbulent flow configurations as turbulent flow regimes are typically associated with increased heat transfer and thus reduced area of heat exchange. 120 Figure 16a illustrates the percent overprediction of the area of heat exchange resulting from the use of a simple weighted-average linear mixing rule of the pure component thermal conductivities, viscosities, and densities in a heat exchanger operating in the fully developed turbulent flow regime with a constant flow velocity and hydraulic diameter. Figure 16b illustrates the percent overprediction in the laminar flow regime with a constant surface heat flux.…”

Section: Pumping Power Andmentioning

confidence: 99%

Phase Equilibrium and Transport Properties of the Ionic Liquid 1-Ethyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)amide and Compressed Difluoromethane and Pentafluoroethane

Al-Barghouti,

Baca,

Shiflett

et al. 2024

Ind. Eng. Chem. Res.

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Global phase behavior, high-pressure vapor−liquid equilibrium (VLE), density, viscosity, and thermal conductivity have been measured for binary mixtures of the ionic liquid (IL) 1-ethyl-3-methylimidazolium bis-(trifluoromethylsulfonyl)amide ([EMIm][Tf 2 N]) with either of the hydrofluorocarbon (HFC) gases, pentafluoroethane (R-125) or difluoromethane (R-32), at temperatures from 298.15 to 398.15 K and pressures to 4 MPa. At all VLE conditions investigated, R-32 is more soluble than R-125 at a given temperature and pressure. These systems are modeled with the NRTL activity coefficient model and Peng− Robinson equation of state. The mixture liquid viscosity decreases drastically with increasing compositions of dissolved gas. The thermal conductivity of both systems remains dominated by that of the IL until very high compositions of dissolved solute are achieved (>80% mol HFC). Simple mixing rules between the pure component properties can cause large, and potentially costly, errors in engineering design, as illustrated for examples in required pumping power and necessary surface area in a heat exchanger.

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Section: Pumping Power Andmentioning

confidence: 99%

Phase Equilibrium and Transport Properties of the Ionic Liquid 1-Ethyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)amide and Compressed Difluoromethane and Pentafluoroethane

Al-Barghouti,

Baca,

Shiflett

et al. 2024

Ind. Eng. Chem. Res.

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“…1 However, their limited thermal conductivity prompts the use of methods like fin insertion, geometry alteration, and enhanced thermophysical characteristics in working fluids to improve performance. 2 To address this, nanofluids, consisting of nanometer-sized particles suspended in base fluids like water or oil, are employed due to their excellent physical properties. 3 Nanoparticles, typically metals, oxides, or carbides, enhance thermal conductivity, positively impacting the heat transfer coefficient between surfaces and the working fluid.…”

Section: Introductionmentioning

confidence: 99%

“…Heat exchanger is employed to transfer heat from one variable‐temperature fluid to another in a variety of industries, including petroleum, gasoline, chemical industries, power generation, heating, air conditioning, heat recovery, and chemical processes 1 . However, their limited thermal conductivity prompts the use of methods like fin insertion, geometry alteration, and enhanced thermophysical characteristics in working fluids to improve performance 2 . To address this, nanofluids, consisting of nanometer‐sized particles suspended in base fluids like water or oil, are employed due to their excellent physical properties 3 .…”

Section: Introductionmentioning

confidence: 99%

Thermal performance investigation of N‐shape double‐pipe heat exchanger using Al₂O₃, TiO₂, and Fe₃O₄‐based nanofluids

Salim,

Jihan,

Das

et al. 2024

Energy Science & Engineering

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Researchers and engineers are actively working on enhancing the efficiency of heat exchangers in engineering applications by developing novel designs, exploring new materials, and utilizing nanofluids. Three kinds of nanofluids with varying concentrations are investigated in this paper. The objective is to assess the performance of N‐shaped double‐pipe heat exchanger used in thermoelectric power plants. The performance has been evaluated using COMSOL Multiphysics software. The findings show that higher nanofluid concentrations resulted in elevated heat transfer coefficients and improved efficiency of N‐shape double pipe heat exchanger. The analysis revealed that a mere 1% rise in the volume fraction of nanofluids enhanced the efficiency of the heat exchanger on average 23% when compared to the base fluid (water). In comparison to the N‐shape double pipe (Inconel 625) heat exchangers, the N‐shape double pipe (copper) heat exchangers appear to be more efficient. The introduction of nanoparticles has a notable impact on the heat transfer coefficients. Specifically, within an N‐shaped double pipe (copper) heat exchanger, the inclusion of a 1% volume fraction results in a 2.09% enhancement in the heat transfer coefficient for Al2O3/water, a 1.3% improvement for Fe3O4/water, and a 1.15% increase for TiO2/water. It also exposed that adding 1% Al2O3/water led to a significant 0.623% increase in effectiveness, while TiO2/water showed a 0.259% rise, and Fe3O4/water exhibited a 0.375% improvement. Moreover, increasing the Reynolds number enhances the Nusselt number for Al2O3/water and Fe3O4/water nanofluids by 55.22%, and for TiO2/water by 54.60% at a 6% volume concentration, leading to additional increases in exchanger efficiency. Therefore, the augmentation in nanofluid concentration leads to a reduction in the temperature pinch points both at the intake and outflow. This observation suggests that nanofluids exhibit a superior ability compared to conventional fluids when it comes to effectively lowering temperatures.

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“…Passive methods use different types of extended surfaces, and elements are used instead of external power (Bhattacharyya et al , 2022; Thapa et al , 2021). Some of the main techniques in passive method are turbulator insertion (Wijayanta et al , 2019; Khoshvaght-Aliabadi et al , 2016b), using nanofluids (Duangthongsuk and Wongwises, 2010), geometry changes (Wang et al , 2019; Farnam et al , 2018), extended surface area (fins) (Ravikumar and Raj, 2021; Tavousi et al , 2023) and a combination of these techniques, such as a combination of vortex-generator and geometry change with nanofluids (Khoshvaght-Aliabadi et al , 2018b; Khoshvaght-Aliabadi et al , 2016a; Khoshvaght-Aliabadi et al , 2018a). The combined method uses the effects of the active and passive methods in combination (Alam and Kim, 2018).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of laminar heat transfer and fluid flow characteristics of Al₂O₃nanofluid in a double tube heat exchanger

Tavousi,

Perera,

Flynn

et al. 2023

HFF

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Purpose The purpose of the study is to numerically investigate the characteristics of laminar heat transfer and fluid flow in a double tube heat exchanger (DTHE) using water-aluminum oxide (Al2O3) nanofluid. The study examines the effects of nanofluid in both counter and parallel flow configurations. Furthermore, an exergy analysis is conducted to assess the impact of nanofluid on exergy destruction. Design/methodology/approach The single-phase method has been used for Al2O3 nanoparticles in water as base fluid in a laminar regime for Reynolds numbers from 400 to 2,000. The effects of nanoparticle volume fractions (0 to 0.1), Nusselt number, Reynolds number, heat transfer coefficient, pressure drop, performance evaluation criteria (PEC) and the impact of counter and parallel flow direction have been studied. Findings The findings indicate that the incorporation of nanoparticles into the water enhances the heat transfer rate of DTHE. This enhancement is attributed to the improved thermal properties of the working fluid and its impact on the thermal boundary layer. Nusselt number, heat transfer coefficient, and PEC increase by approximately 19.5%, 58% and 1.2, respectively, in comparison to pure water. Conversely, the pressure drop experiences a 5.3 times increase relative to pure water. Exergy analysis reveals that nanofluids exhibit lower exergy destruction compared to pure water. The single-phase method showed better agreement with the experimental results compared to the two-phase method. Originality/value Dimensionless correlations were derived and validated with experimental and numerical results for the Nusselt number and PEC for both counter and parallel flow configurations based on the Reynolds number and nanoparticles volume fraction with high accuracy to predict the performance of DTHE without performing time-consuming simulations. Also, an exergy analysis was performed to compare the exergy destruction between nanofluid and pure water.

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Heat transfer and fluid flow characteristics of the passive method in double tube heat exchangers: A critical review

Cited by 53 publications

References 190 publications

Phase Equilibrium and Transport Properties of the Ionic Liquid 1-Ethyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)amide and Compressed Difluoromethane and Pentafluoroethane

Phase Equilibrium and Transport Properties of the Ionic Liquid 1-Ethyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)amide and Compressed Difluoromethane and Pentafluoroethane

Thermal performance investigation of N‐shape double‐pipe heat exchanger using Al₂O₃, TiO₂, and Fe₃O₄‐based nanofluids

Numerical investigation of laminar heat transfer and fluid flow characteristics of Al₂O₃nanofluid in a double tube heat exchanger

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Heat transfer and fluid flow characteristics of the passive method in double tube heat exchangers: A critical review

Cited by 53 publications

References 190 publications

Phase Equilibrium and Transport Properties of the Ionic Liquid 1-Ethyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)amide and Compressed Difluoromethane and Pentafluoroethane

Phase Equilibrium and Transport Properties of the Ionic Liquid 1-Ethyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)amide and Compressed Difluoromethane and Pentafluoroethane

Thermal performance investigation of N‐shape double‐pipe heat exchanger using Al2O3, TiO2, and Fe3O4‐based nanofluids

Numerical investigation of laminar heat transfer and fluid flow characteristics of Al2O3nanofluid in a double tube heat exchanger

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Product

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Thermal performance investigation of N‐shape double‐pipe heat exchanger using Al₂O₃, TiO₂, and Fe₃O₄‐based nanofluids

Numerical investigation of laminar heat transfer and fluid flow characteristics of Al₂O₃nanofluid in a double tube heat exchanger