Experimental research on the performance of nanofluid flow through conically coiled tubes

Heyhat, Mohammad Mahdi; Jafarzad, Ali; Changizi, P.; Asgari, Hesam; Valizade, M.

doi:10.1016/j.powtec.2020.05.058

Cited by 16 publications

(6 citation statements)

References 20 publications

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“…The average heat transfer coefficient for the considered heated tube with various working fluids is calculated using Equation ( 17) [12].…”

Section: Data Reductionmentioning

confidence: 99%

“…Mukherjee et al have presented 94% enhancement in forced convective flow boiling heat transfer of Al 2 O 3 /water nanofluid flowing through a horizontal tube compared to water [11]. Heyhat et al have analyzed the heat transfer and pressure drop characteristics of SiO 2 /water nanofluid flowing through a conically coiled tube considering the effects of volume concentrations, cone angle and cone pitch [12]. Ho et al have experimentally and numerically explored the cooling performance characteristics of Al 2 O 3 /water nanofluid flowing through a copper tube under constant heat flux condition [13].…”

Section: Introductionmentioning

confidence: 99%

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

Garud

Lee

2021

Symmetry

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In the present study, the heat transfer characteristics, namely, heat transfer coefficient, Nusselt number, pressure drop, friction factor and performance evaluation criteria are evaluated for water, Al2O3 and Al2O3/Cu nanofluids. The effects of Reynolds number, volume fraction and composition of nanoparticles in hybrid nanofluid are analyzed for all heat transfer characteristics. The single particle and hybrid nanofluids are flowing through a plain straight tube which is symmetrically heated under uniform heat flux condition. The numerical model is validated for Nusselt number within 7.66% error and friction factor within 8.83% error with corresponding experimental results from the previous literature study. The thermophysical properties of hybrid nanofluid are superior to the single particle nanofluid and water. The heat transfer coefficient, Nusselt number and pressure drop show increasing trend with increase in the Reynolds number and volume fraction. The friction factor shows the parabolic trend, and the performance evaluation criteria shows small variations with change in Reynolds number. However, both friction factor and performance evaluation criteria have increased with increase in the volume fraction. The 2.0% Al2O3/Cu with equal composition of both nanoparticles (50/50%) have presented superior heat transfer characteristics among all working fluids. Further, the heat transfer characteristics of 2.0% Al2O3/Cu hybrid nanofluid are enhanced by changing the nanoparticle compositions. The performance evaluation criteria for 2.0% Al2O3, 2.0% Al2O3/Cu (50/50%), 2.0% Al2O3/Cu (75/25%) and 2.0% Al2O3/Cu (25/75%) are evaluated as 1.08, 1.11, 1.10 and 1.12, respectively.

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“…The average heat transfer coefficient for the considered heated tube with various working fluids is calculated using Equation ( 17) [12].…”

Section: Data Reductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Garud

Lee

2021

Symmetry

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“…It was predicted that, as cone angle at apex varied from 0°to 65° coefficient of exergy performance and exergy efficiency decreased by 11.1% and 32.56% respectively. Heyhat et al, [42] experimentally studied conical tubes under usage of Sio2/water nanofluids. Constant heat flux was provided at the outer surface.…”

Section: Introductionmentioning

confidence: 99%

Suggestion of Correlations to Obtain Shell and Tube Side Nusselt Numbers in Coiled Heat Exchangers

Magar Susheel Madhavrao,

Gugliani Gaurav Kumar,

Navthar Ravindra Rambhau

2024

ARFMTS

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In coiled tube heat exchangers increase in curvature ratio and effective contact of shell fluid with coil surface led to better thermal characteristics. This work addresses study of thermal performance, shell and tube heat transfer coefficients (ho and hi). Also, mathematical correlations are predicted to obtain shell and tube Nusselt numbers (Nuo and Nui). In the designing of compact coiled heat exchangers consisting of straight helical coil (SHC), conical coil (CC) and spiral coil knowledge of Nuo and Nui is necessary whereas mathematical correlation to calculate Nuo considering variations in shell geometry is not found. Five heat exchangers consisting of three cone coils (angle, ϴ = 30°, 50° and 70°), spiral coil (ϴ = 0°) and SHC (ϴ = 90°) are tested. Using Wilson plot method ho and hi are obtained for wide range of tube side Reynolds numbers (Rei = 3700 - 21000). It is observed that, highest ho is obtained for ϴ = 30°CC with better thermal performance. Lowest ho is obtained for ϴ = 90°SHC. Ratio of height of shell, Hs and diameter of shell, Dso is considered in prediction of single correlation as: Nuo = 16.55.Reo0.55.Pro0.4 *(Hs/Dso)0.096. Comparison with experimental findings shows variation of 0-14%. Similarly two correlations are proposed as: Nui = 0.0512.Rei0.80.Pri0.4.CRave0.18 and Nui = 0.0365.Dei0.815.Pri0.4.CRave-0.3. A fair agreement is found with existing researchers.

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“…Heyhat et al [10] examined the effect of nanofluids and CCT geometrical variables on pressure drop and heat transfer. With studies performed under laminar conditions, various SiO2/water concentrations were utilised.…”

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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Experimental research on the performance of nanofluid flow through conically coiled tubes

Cited by 16 publications

References 20 publications

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

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

Suggestion of Correlations to Obtain Shell and Tube Side Nusselt Numbers in Coiled Heat Exchangers

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

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