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TitleEfficient heat transfer augmentation in channels with semicircle ribs and hybrid Al2O3-Cu/water nanofluids
 
AuthorTogun, H; Homod, R Z; Yaseen, Z M; Abed, A M; Dhabab, J M; Ibrahem, R K; Dhahbi, S; Rashidi, M M; Ahmadi, G; Yaïci, WORCID logo; Mahdi, J M
SourceNanomaterials vol. 12, 15, 2720, 2022 p. 1-15, https://doi.org/10.3390/nano12152720 Open Access logo Open Access
Image
Year2022
Alt SeriesNatural Resources Canada, Contribution Series 20220291
PublisherMDPI
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
SubjectsEconomics and Industry; Science and Technology; fluid mechanics; thermal analyses; thermal power; fluid flow; Heating; Performance assessment; Energy; Energy conservation
Illustrationsschematic diagrams; tables; profiles
ProgramCanmetENERGY - Ottawa Buildings and Renewables Group - Hybrid Energy Systems
Released2022 08 07
AbstractGlobal technological advancements drive daily energy consumption, generating additional carbon-induced climate challenges. Modifying process parameters, optimizing design, and employing high-performance working fluids are among the techniques offered by researchers for improving the thermal efficiency of heating and cooling systems. This study investigates the heat transfer enhancement of hybrid Al2O3-Cu/water nanofluids flowing in a two-dimensional channel with semicircle ribs. The novelty of this research is in employing semicircle ribs combined with hybrid nanofluids in turbulent flow regimes. A computer modeling approach using a finite volume approach with k-? shear stress transport turbulence model was used in these simulations. Six cases with varying rib step heights and pitch gaps, with Re numbers ranging from 10,000 to 25,000, were explored for various volume concentrations of hybrid nanofluids Al2O3-Cu/water (0.33%, 0.75%, 1%, and 2%). The simulation results showed that the presence of ribs enhanced the heat transfer in the passage. The Nusselt number increased when the solid volume fraction of Al2O3-Cu/water hybrid nanofluids and the Re number increased. The Nu number reached its maximum value at a 2 percent solid volume fraction for a Reynolds number of 25,000. The local pressure coefficient also improved as the Re number and volume concentration of Al2O3-Cu/water hybrid nanofluids increased. The creation of recirculation zones after and before each rib was observed in the velocity and temperature contours. A higher number of ribs was also shown to result in a larger number of recirculation zones, increasing the thermal performance.
Summary(Plain Language Summary, not published)
Global technological advancements drive daily energy consumption, generating additional carbon-induced climate challenges. Modifying process parameters, optimizing design, and employing high-performance working fluids are among the techniques offered by researchers for improving the thermal efficiency of heating and cooling systems. This study investigates the heat transfer enhancement of hybrid "Al2O3-Cu/water" nanofluids flowing in a two-dimensional channel with semicircle ribs. The novelty of this research is in employing semicircle ribs combined with hybrid nanofluids in turbulent flow regimes. A computer modelling approach using a finite volume approach with k-? shear stress transport turbulence model was used in these simulations. Six cases with varying rib step heights and pitch gaps, with Reynolds numbers ranging from 10,000 to 25,000, were explored for various volume concentrations of hybrid nanofluids Al2O3-Cu/water (0.33%, 0.75%, 1%, and 2%). The simulation results showed that the presence of ribs enhanced the heat transfer in the passage. The Nusselt number increased when the solid volume fraction of "Al2O3-Cu/water" hybrid nanofluids and the Re number increased. The Nu number reached its maximum value at a 2 percent solid volume fraction for a Reynolds number of 25,000. The local pressure coefficient also improved as the Re number and volume concentration of "Al2O3-Cu/water" hybrid nanofluids increased. The creation of recirculation zones after and before each rib was observed in the velocity and temperature contours. A higher number of ribs was also shown to result in a larger number of recirculation zones, increasing the thermal performance.
GEOSCAN ID330763

 
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