A simple homogeneous numerical solution for nanofluid natural convection in an enclosure with disconnected and conducting solid blocks

Nascimento, Gustavo; Lugarini, Alan; Germer, Eduardo Matos; Franco, A.

doi:10.1007/s40430-019-1764-1

Cited by 4 publications

(2 citation statements)

References 40 publications

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“…Three-dimensional numerical studies reported multiple states and bifurcations on natural convection in a rectangular cavity with partially heated vertical walls (Gelfgat, 2017). The study of natural convection has been extended to nanofluids (Nascimento et al, 2019). Correlation equations for the Nusselt number in terms of the Rayleigh number, heated length, and volume fraction were reported in partially heated cylindrical enclosures (Guestal et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Natural convection in a partially heated cylinder: A numerical study

Núñez¹,

Beltrán²,

Rivero³

2021

Journal of Theoretical and Applied Mechanics

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This work presents a numerical study on a natural convective flow in a cylindrical container heated from below, cooled from above, and partially heated from the lateral wall. Mass, momentum and energy equations were solved with a developed hybrid Fourier-finite volume code and validated with the commercial software COMSOL Multiphysics for steady-state solutions. The primary solutions correspond to steady-states C m with azimuthal wavenumbers m. The results show mode competition between different states leading to many flow solutions including steady axisymmetric, steady non-axisymmetric, time-dependent pulsating wave solutions, and other flow states with a variety of spatiotemporal symmetries.

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Section: Introductionmentioning

confidence: 99%

Natural convection in a partially heated cylinder: A numerical study

Núñez¹,

Beltrán²,

Rivero³

2021

Journal of Theoretical and Applied Mechanics

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“…This can be mainly attributed to the lack of proper knowledge regarding the thermophysical properties of nanofluids such as thermal conductivity and viscosity. A broad range of studies pertaining to nanofluid flow phenomena is available in the open literature [16][17][18][19][20]. Iqbal et al [21] investigated the effect of Brownian motion and thermophoresis on the thin film flow of Carreau nanofluid and observed that the Brownian motion increases the randomness of liquid particles leading to higher heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of Al2O3–R718 nanorefrigerant turbulent flow through a flooded chiller tube: a numerical investigation

Nair

Parekh

Tailor

2020

J Braz. Soc. Mech. Sci. Eng.

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The current study presents a numerical analysis of the heat transfer and the pressure drop quantification of Al 2 O 3-R718-based nanorefrigerant flow through a circular tube of a flooded evaporator chiller. R718 (water) is one of the most widely used secondary refrigerants in HVAC applications. The flow Reynolds number through a chiller tube of a typical 325 TR capacity water chiller is between 13,000 and 33,000. Therefore, the nanorefrigerant flow was simulated at Reynolds number (Re) varying between 13,000 and 33,000 for three distinct particle volume fractions (ϕ): 0.25%, 0.5% and 1.0%. The temperature variation in the computational domain was between 278 and 288 K. Therefore, temperature-dependent thermophysical property values were utilised in the present study in order to get more reliable results. It was found that the surface heat flux is higher for Al 2 O 3-R718 nanorefrigerants in comparison with that of water. The average surface heat flux increases with increase in particle volume fraction, but the pumping power also elevates with particle volume fraction. The turbulence in the nanorefrigerant flow was also analysed and discussed. Furthermore, the entropy generation analysis revealed that the entropy generation rate for Al 2 O 3-R718 nanorefrigerants was lower in comparison with that of pure R718. The overall performance of the nanorefrigerant was analysed using two different thermal performance parameters, and it was found that the thermal performance parameter was higher than 1 for all the flow scenarios investigated in the current simulation.

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