Natural convection heat transfer in a nanofluid-filled trapezoidal enclosure

Saleh, Habibis; Roslan, Rozaini; Hashim, Ishak

doi:10.1016/j.ijheatmasstransfer.2010.09.053

Cited by 176 publications

(61 citation statements)

References 32 publications

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“…They demonstrated that usage of different models for viscosity and thermal conductivity has a major impact on heat transfer and flow characteristics. Heat transfer enhancement utilizing water-Cu and water-Al 2 O 3 nanofluids in a trapezoidal enclosure was studied by numerical means in the work of Saleh et al [8] with a focus on the effects of Grashof number, inclination angle of the sloping wall, volume fraction of nanoparticles on flow and temperature patterns as well as the heat transfer rate within the enclosure. They report that acute sloping wall and Cu nanoparticles with high concentration are effective to enhance the rate of heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement for natural convection flow of water-based nanofluids in a square enclosure

Ternik¹,

Rudolf²

2012

Int. j. simul. model.

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Numerical analysis is performed to examine the heat transfer enhancement of Au, Al 2 O 3 , Cu and TiO 2 water-based nanofluids. The analysis uses a two-dimensional enclosure under natural convection heat transfer conditions and has been carried out for the Rayleigh number range 10 3 ≤ Ra ≤ 10 5 , and for the nanoparticles' volume fraction range 0 ≤ φ ≤ 0,10. The governing equations were solved with the standard finite-volume method and the hydrodynamic and thermal fields were coupled together using the Boussinesq approximation. Highly accurate numerical results are presented in the form of average Nusselt number and heat transfer enhancement. The results indicate clearly that the average Nusselt number is an increasing function of both, Rayleigh number and volume fraction of nanoparticles. The results also indicate that heat transfer enhancement is possible using nanofluids in comparison to conventional fluids, resulting in the compactness of many industrial devices. However, low Rayleigh numbers show more enhancement compared to high Rayleigh numbers.

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Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement for natural convection flow of water-based nanofluids in a square enclosure

Ternik¹,

Rudolf²

2012

Int. j. simul. model.

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“…They found that maximum average Nusselt number for high Rayleigh numbers occurred when the hot and cold parts were located in the bottom and middle region of the vertical walls respectively. Saleh et al (2011) investigated numerically free convection of nanofluid in a trapezoidal enclosure numerically and developed a correlation for the average Nusselt number as a function of the angle of the sloping wall, effective thermal conductivity and viscosity as well as Grashof number. conducted a numerical simulation to investigate the problem of free convection of the TiO2 water nanofluid in rectangular cavities differentially-heated on adjacent walls.…”

Section: Introductionmentioning

confidence: 99%

Natural Convection in a Square Cavity Containing a Nanofluid and a Partially-heated Square Block at the Centre

Bouchta¹,

Feddaoui²,

Ihssini³

2017

AJHMT

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This work focuses on the numerical study of natural convection fluid flow and heat transfer of (Cu, Al2O3 and TiO2)-water nanofluids in the annuli of two partially-heated square ducts. The left and right vertical walls of the outer duct have constant but different temperatures Th and Tc respectively, while the inner duct is maintained at the same and opposite temperatures. The ducts top and bottom walls are kept insulated. The governing equations are solved numerically using the finite-volume method. The SIMPLEC algorithm was employed to couple velocity and pressure fields. Using the developed in house code, the effects of pertinent parameters such as the Rayleigh number, volume fraction of nanoparticles and aspect ratio on the fluid flow and heat transfer inside the cavity were investigated. It is observed from the results that the average Nusselt number increases when both the Rayleigh number and the volume fraction of the nanoparticles increase. Moreover, heat transfer in nanofluid with Cu nanoparticles is much better than Al2O3 and TiO2 nanoparticles.

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“…Many researches on natural convection in conventional configurations of square, rectangular and another configurations enclosure are done, as evidenced by [1][2][3][4]. [5] Investigated numerically the transient laminar natural convection regimes occurring in a thermal convection loop heated from below and cooled from above for a wide range of Rayleigh numbers.…”

Section: Introductionmentioning

confidence: 99%

3-D Air Flow in a Toroidal Natural Convection Loop

Saleh¹

2015

IJCA

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Heat transfer characteristics of air flows in concentric toroidal annular tubes filled with porous media were numerically investigated. The toroidal annulus is constant walls temperature where the outer wall temperature is lower than the inlet temperature. The numerical methodology was based on the finite difference approximation method. The computations were performed for vertical and horizontal toroidal ring, four toroidal length and four radius ratios cases for a modified Rayleigh number range (10 ≤ Ra ≤ 5000). The inner tube radius ranged from 0.15 to 0.4 m with the radius ratios Rr 0.333, 0.555, 0.777 and 0.888 and a length of 0.05, 0.1, 0.15 and 0.2m. The local Nusselt number in the angular direction for both walls and the average Nusselt number in concentric toroidal annular tubes were obtained. In addition the isothermal lines and the streamlines were investigated. The results show that The vertical toroidal loop is more suitable than the horizontal one because the heat transfer is less so the temperature values will be higher and remain high for a longer time which is required in such devices The best design of such devices is to take L=0.05 with inner radius of 0.15 m and to use it at δ =0 (vertical)

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Natural convection heat transfer in a nanofluid-filled trapezoidal enclosure

Cited by 176 publications

References 32 publications

Heat transfer enhancement for natural convection flow of water-based nanofluids in a square enclosure

Heat transfer enhancement for natural convection flow of water-based nanofluids in a square enclosure

Natural Convection in a Square Cavity Containing a Nanofluid and a Partially-heated Square Block at the Centre

3-D Air Flow in a Toroidal Natural Convection Loop

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