Performance Enhancement of Double Tube Heat Exchanger Using Coiled Fins

Khalil, A.; El-Agouz, S.A.; Zohir, A. E.; Farid, A.M.

doi:10.21608/erjeng.2019.125492

Cited by 1 publication

(1 citation statement)

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“…When a 0.5% volume concentration of MWCNT/water nanofluid was employed at a coil Re of 15,000, the maximum improvement in Nu, i.e., 31.5%, and the highest-pressure decrease, 47.35 %, were found under the same situations. Khalil et al [40] studied experimentally the impact of placing coil wire in the shell side of a doublepipe heat exchanger on pressure drop and heat transfer. As comparison to the smooth pipe, the heat transfer coefficient rose up to 1.59 while the pressure drop increased 10 times.…”

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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Section: Introductionmentioning

confidence: 99%