Geometrical and coil revolution effects on the performance enhancement of a helical heat exchanger using nanofluids

Hasan, Md. Jahid; Ahmed, Shams Forruque; Bhuiyan, Arafat A.

doi:10.1016/j.csite.2022.102106

Cited by 39 publications

(16 citation statements)

References 30 publications

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“…The authors mentioned that the combined variations of coil pitch and nanoparticles volume fraction can be used to optimize the heat transfer. Similar conclusions on the enhancement of the heat transfer in coiled heat exchangers by using nanofluids were presented in the recently published works of Singh et al [34], Hasan et al [35], and Tuncer et al [36].…”

Section: Introductionsupporting

confidence: 86%

Experimental Analysis of the Thermal Performance Enhancement of a Vertical Helical Coil Heat Exchanger Using Copper Oxide-Graphene (80-20%) Hybrid Nanofluid

et al. 2022

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The thermal performance enhancement of a vertical helical coil heat exchanger using distilled water-based copper oxide-graphene hybrid nanofluid has been analyzed experimentally. Accordingly, the focus of this study is the preparation of CuO-Gp (80-20%) hybrid nanoparticles-based suspensions with various mass fractions (0% ≤ wt ≤ 1%). The volume flow rate is ranged from 0.5 L·min−1 to 1.5 L·min−1 to keep the laminar flow regime (768 ≤ Re ≤ 1843) and the supplied hot fluid’s temperature was chosen to equal 50 °C. To ensure the dispersion and avoid agglomeration an ultrasound sonicator is used and the thermal conductivity is evaluated via KD2 Pro Thermal Properties Analyzer. It has been found that the increment in nanoparticles mass fraction enhances considerably the thermal conductivity and the thermal energy exchange rate. In fact, an enhancement of 23.65% in the heat transfer coefficient is obtained with wt = 0.2%, while it is as high as 79.68% for wt = 1%. Moreover, increasing Reynolds number results in a considerable augmentation of the heat transfer coefficient.

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Section: Introductionsupporting

confidence: 86%

Experimental Analysis of the Thermal Performance Enhancement of a Vertical Helical Coil Heat Exchanger Using Copper Oxide-Graphene (80-20%) Hybrid Nanofluid

et al. 2022

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“…Investigating the impact of flow rates on smooth and corrugated double-tube heat exchangers, Zheng et al 24 found that the use of nanofluids and thread structures can enhance their thermal performance. Similarly, a study by Hasan et al 25 analyzed the heat transfer performance of a helical heat exchanger with different water-based nanofluids, and found that Al 2 O 3 exhibited the highest heat transfer rate while SiO 2 performed the least efficiently. Another study by Gugulothu et al 26 focused on shell-and-tube heat exchangers and found that using Al 2 O 3 nanofluid as the working fluid resulted in superior heat transfer rates compared to other nanofluids and base fluid.…”

Section: Introductionmentioning

confidence: 98%

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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“…According to observations, at a Reynolds number of 2702 and a volume fraction of 1%, h and Nu are enhanced by 36.05 and 27.47 %, respectively, and the TPF is enhanced by 1.2094 compared to the base fluid. Hasan et al [15] studied numerically the heat transfer performance of an HCT heat exchanger using various nanofluids, taking into account diverse head-ribbed geometries with varied coil revolutions. The HTR was increased by 20% to 80% using a 2-rib head geometry and by 17% to 66% using a 30-turn coil.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the thermal-hydraulic performance of conically coiled tubes using Al2O3/water nanofluid

Abdel‐Ghany

Sharafeldin²,

Abdellatif³

et al. 2023

Journal of Engineering Research

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The thermal-hydraulic performance of conically coiled tubes (CCTs) was investigated experimentally under constant heat flux boundary conditions in this study. The effect of several factors, such as the flow Dean number, coil torsion, and varied nanoparticle weight concentrations, on the flow's heat transfer coefficient and pressure drop was studied. Thermo-hydraulic performance was studied at 0.3%, 0.6%, and 0.9% volume concentrations (ϕ) of Al2O3/water nanofluid, a Dean number (De) of 1148-2983, and coil torsions (λ) ranging from 0.02 to 0.052. Results indicated that the heat transfer rates (HTRs) of CCTs increased when the coil torsion was decreased. According to the findings, the average heat transfer coefficient (havg) rises as De increases, while friction factor (ƒ) tends to decrease. The average increase in havg is 32% at lower De values and 26% at higher De values as the nanofluid concentration increased from 0.3% to 0.9%. The thermal performance factor (TPF) improved when λ lowered from 0.052 to 0.02.

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Geometrical and coil revolution effects on the performance enhancement of a helical heat exchanger using nanofluids

Cited by 39 publications

References 30 publications

Experimental Analysis of the Thermal Performance Enhancement of a Vertical Helical Coil Heat Exchanger Using Copper Oxide-Graphene (80-20%) Hybrid Nanofluid

Experimental Analysis of the Thermal Performance Enhancement of a Vertical Helical Coil Heat Exchanger Using Copper Oxide-Graphene (80-20%) Hybrid Nanofluid

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

Experimental investigation of the thermal-hydraulic performance of conically coiled tubes using Al2O3/water nanofluid

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Geometrical and coil revolution effects on the performance enhancement of a helical heat exchanger using nanofluids

Cited by 39 publications

References 30 publications

Experimental Analysis of the Thermal Performance Enhancement of a Vertical Helical Coil Heat Exchanger Using Copper Oxide-Graphene (80-20%) Hybrid Nanofluid

Experimental Analysis of the Thermal Performance Enhancement of a Vertical Helical Coil Heat Exchanger Using Copper Oxide-Graphene (80-20%) Hybrid Nanofluid

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

Experimental investigation of the thermal-hydraulic performance of conically coiled tubes using Al2O3/water nanofluid

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