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

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...

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Bibliographic Details
Published in:Journal of the Brazilian Society of Mechanical Sciences and Engineering 2021-03, Vol.43 (3), Article 122
Main Authors: Sica, Luiz Umberto Rodrigues, Vasconcelos, Adriano Akel, Parise, José Alberto Reis, Gómez, Abdul Orlando Cárdenas, Filho, Enio Pedone Bandarra
Format: Article
Language:English
Subjects:
Attenuation
Coils
Cold flow
Engineering
Fluid dynamics
Fluid flow
Heat exchangers
Inlet temperature
Low temperature
Mass flow rate
Mechanical Engineering
Nanofluids
Nanoparticles
Nanoparticles and Passive-Enhancement Methods in Energy
Reynolds number
Single wall carbon nanotubes
Technical Paper
Thermal conductivity
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Summary: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.
ISSN:1678-5878
1806-3691
DOI:10.1007/s40430-021-02833-9