Effect of γ-Al2O3/water nanofluid on the thermal performance of shell and coil heat exchanger with different coil torsions

Elshazly, K. M.; Sakr, R. Y.; Ali, Rashed; Salem, Mohamed

doi:10.1007/s00231-016-1949-4

Cited by 24 publications

(10 citation statements)

References 26 publications

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“…Moreover, notwithstanding the stability and homogeneity achieved with nanofluid samples, traditional single-phase flow Nusselt number correlations were occasionally found unsuitable for nanofluids of different particle concentrations, for example [24]. These convection heat transfer studies were soon followed by actual tests of nanofluids in heat exchangers, the actual channels of which acted as the heat transfer test sections, e.g., [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…These works provided, instead, a real estimate of the heat exchanger performance parameters when operating with nanofluids . In respect to heat exchanger type, works were divided into: (i) shell and tube [26,[28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][76][77][78][79][80]; (ii) double tube [25,[72][73][74][75][76]; and (iii) shell and coil [27,[67][68][69][70][71]. Studies on tubular heat exchangers using nanoparticles of the same nature, graphene and MWCNT, were found [67, [72][73][74][75][76][77][78][79][80], respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the articles cited above, no studies on tubular heat exchangers with SWCNT nanoparticles were found. Furthermore, this shortage of studies of nanofluids in shell and coil heat exchangers extends to all other nanoparticle materials [27,[67][68][69][70][71], reviewed next.…”

Section: Introductionmentioning

confidence: 99%

“…In a further work, Elshazly et al [27] investigated the thermal performance of five HCTs with 0-2 vol% γ-Al 2 O 3 (40 nm)/water nanofluid, under turbulent flow and coil torsions ranging from 0.0442 to 0.1348. Authors defined the thermal performance index that rises with nanoparticle concentration, coil torsion, helically coiled tube side inlet temperature, and flow rate.…”

Section: Introductionmentioning

confidence: 99%

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Thermal performance analysis of a 1–5 TEMA E shell and coil heat exchanger operating with SWCNT–water nanofluid with varied nanoparticle concentration

Sica

Vasconcelos

Parise

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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Single-walled carbon nanotube-water nanofluids were tested in a 1-5 TEMA E shell and coil heat exchanger. Cold nanofluid, flowing inside the coil, was heated by hot water flowing in the shell side. Volumetric fraction of nanoparticles, inlet temperature of nanofluid, and mass flow rate of nanofluids ranged from 0 to 0.21%, 2.3 to 23.4 °C, and 40 to 90 g/s, respectively. For a given Reynolds number, at the coil side, pure base fluid (φ = 0%) performed better than low-concentration nanofluid samples (φ = 0.035% and 0.053%) and was nearly equivalent to the nanofluid of highest concentration, φ = 0.21%. The thermal conductivity enhancement factor of the nanofluid ranged from 0 to 0.2 and to 0.45, at inlet temperatures of 30 °C and 50 °C, respectively. It is believed to work in favor of a better performance of the nanofluid samples. On the other hand, the unusual (literature-wise) low temperature of the nanofluid further amplified the enhancement of the nanofluid viscosity, with a reduction effect on the Reynolds number. Besides, other thermal resistances of the heat exchanger work toward an attenuation of the enhancement effect that nanoparticles may have in the heat exchanger performance. KeywordsSWCNT-water nanofluids • 1-5 TEMA E • Shell and coil heat exchanger • Helically coiled tube heat exchanger • Thermal performance • Volumetric concentration effects This article has been selected for a Topical Issue of this journal on Nanoparticles and Passive-Enhancement Methods in Energy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal performance analysis of a 1–5 TEMA E shell and coil heat exchanger operating with SWCNT–water nanofluid with varied nanoparticle concentration

Sica

Vasconcelos

Parise

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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“…It is clear most of the works concentrated on applying fins/vortex generators. Here, it is aimed to test another approach of passive techniques which do not consume any direct power during life [34][35][36][37][38][39][40]. The existing study experimentally judges the heat load/flow resistance associated with an airflow crossing staggered pairs of CCTs/SCTs at different airflow rates.…”

Section: Introductionmentioning

confidence: 99%

Experimental study and thermal performance evaluation of staggered cross flow heat exchangers of semi-circular tubes: I- Effect of pitch ratio and space between bases

A.Alghrubah,

.A. Abd Elrahman,

.R. Salem

et al. 2021

Engineering Research Journal - Faculty of Engineering (Shoubra)

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Staggered cross flow heat exchangers are commonly employed as air coolers and steam generators. This study aims to boost their thermal performance by proposing a modification to the tube geometry; semicircular tube (SCT) instead of complete circular tube (CCT). Through the runs, numerous gaps between SCTs-bases with different pitches in both longitudinal/transversal directions are tested. The runs are performed with moving cooling water through the tubes while heating air flows across the tube bundles. The results state that the SCT can be used as a passive approach for augmenting the heat exchange rates. As geometry, increasing the gap between their bases increases both the heat exchange rate and fluid pressure loss at the same time. Additionally, reducing the longitudinal and/or transversal pitch ratios leads to enlarging these increases. In addition, the thermal performance index (TPI) is slightly augmented by extending the distance between the SCTs' bases or reducing the transversal and/or longitudinal spacings. Also, an increase in the TPI is resulted by raising the airflow rate. Moreover, the extreme determined TPI is 1.98.

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Nanoparticle shape effects on thermal-hydraulic performance of boehmite alumina nanofluid in a horizontal double-pipe minichannel heat exchanger

2019

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Effect of γ-Al2O3/water nanofluid on the thermal performance of shell and coil heat exchanger with different coil torsions

Cited by 24 publications

References 26 publications

Thermal performance analysis of a 1–5 TEMA E shell and coil heat exchanger operating with SWCNT–water nanofluid with varied nanoparticle concentration

Thermal performance analysis of a 1–5 TEMA E shell and coil heat exchanger operating with SWCNT–water nanofluid with varied nanoparticle concentration

Experimental study and thermal performance evaluation of staggered cross flow heat exchangers of semi-circular tubes: I- Effect of pitch ratio and space between bases

Nanoparticle shape effects on thermal-hydraulic performance of boehmite alumina nanofluid in a horizontal double-pipe minichannel heat exchanger

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