Effect of rotating cylinder on heat transfer in a square enclosure filled with nanofluids

Roslan, Rozaini; Saleh, Habibis; Hashim, Ishak

doi:10.1016/j.ijheatmasstransfer.2012.07.051

Cited by 124 publications

(51 citation statements)

References 27 publications

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“…3 between the results of present work and Roslan et al (2012) might be primarily attributed to the prediction of thermophysical properties of nanofluids using different models, in turn leading to deviations in determining the dimensionless rotation velocity and Rayleigh numbers. In this study, with the same condition (R=0.2, φ=0.05 for water-Cu), by employing the Maxwell (1904) and Brinkman (1952)'s models, the dimensionless angular velocity is calculated as 493.56, as against 500 in Roslan et al (2012). In general, good agreement is achieved and thus the numerical method described may be used for the present simulations.…”

Section: Code Validationmentioning

confidence: 61%

“…Therefore, the Richardson number (Ri) is simply dependent on the Rayleigh number and the dimensionless rotational velocity. According to Costa and Raimundo (2010) and Roslan et al (2012), it is assumed that in the case of Ω<0 the inner cylinder moves in the same direction as the flow induced by natural convection from the temperature differences between the hot and cold surfaces. On the contrary, the cylinder revolves against the natural convection induced flow for Ω>0.…”

Section: Governing Equationsmentioning

confidence: 99%

“…2 and with the numerical work of Roslan et al (2012) that considered mixed convection induced by a rotating cylinder in a square enclosure as listed and shown in Table 2 and Fig. 3 in terms of mean Nusselt number and streamlines, respectively.…”

Section: Code Validationmentioning

confidence: 99%

“…8. Namely, there should be an optimum cylinder radius R, i.e., an optimum space between the cylinder and the walls, for a particular nanofluid to transfer heat and mass effectively as mentioned by Roslan et al (2012). This is because moderate R increased the disturbance of natural convection but did not block it.…”

Section: Heat Transfermentioning

confidence: 99%

“…Recently, Roslan et al (2012) studied the effects on heat transfer of a rotating circular cylinder in a square enclosure filled with different kinds of nanofluids. They drew the conclusion that the strength of flow circulation and heat transfer was much stronger for a higher nanoparticle concentration with better conductivity.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Laminar mixed convection heat transfer of SiC-EG nanofluids in a triangular enclosure with a rotating inner cylinder: simulations based on the measured thermal conductivity and viscosity

Wang

Tian

et al. 2015

J. Zhejiang Univ. Sci. A

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A numerical study has been carried out for a laminar steady mixed convection flow in a 2D triangular enclosure with an inner rotating coaxial cylinder, with the enclosure filled with ethylene glycol-silicon carbide (SiC-EG). The thermal conductivity and viscosity of the SiC-EG nanofluids were experimentally determined by using a Decagon Devices KD2 Pro thermal property meter and a rotational Brookfield viscometer, respectively. Various pertinent parameters, such as the dimensionless rotation velocity, solid volume fraction, dimensionless radius of the inner cylinder, and Rayleigh numbers, were analyzed to determine their influences on heat transfer and fluid flow. Results clearly show how the direction of rotation of the cylinder affects the thermal performance in a triangular enclosure. It is found that the average Nusselt number increases with rise in the Rayleigh number or as more nanoparticles are added to the base liquid. It was also observed that at constant Rayleigh number, different rotational conditions have remarkable effects on the flow and heat transfer characteristics.

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Section: Code Validationmentioning

confidence: 61%

Section: Governing Equationsmentioning

confidence: 99%

Section: Code Validationmentioning

confidence: 99%

Section: Heat Transfermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Laminar mixed convection heat transfer of SiC-EG nanofluids in a triangular enclosure with a rotating inner cylinder: simulations based on the measured thermal conductivity and viscosity

Wang

Tian

et al. 2015

J. Zhejiang Univ. Sci. A

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Numerical study of mixed convection nanofluid in an annulus enclosure between outer rotating cylinder and inner corrugation cylinder

Ali

Hamzah

Abdulkadhim³

2018

Heat Trans. Asian Res.

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Numerical investigations are presented for mixed convection problems in a concentric inner sinusoidal cylinder and an outer rotating circular cylinder, which were kept at constant hot and cold temperatures, respectively. The free space between the cylinders and the enclosure walls was filled with a water‐Cu nanofluid. The governing equations are formulated for velocity, pressure, and temperature formulation and are modeled in COMSOL5.2a, a partial differential equation solver based on the Galerkin finite element method. The governing parameters considered are the solid volume fraction, [0, 0.02, 0.04, and 0.06], Re (1, 25, 100, 200, and 300), and Ra (less than 104), and the inner cylinder corrugation frequencies varied from (N = 3, 6, and 9). According to the calculations, the Reynolds number, the Rayleigh number, the nanoparticle volume fraction, and the number of corrugations play an important role of forming the stream and isothermal lines, the local and the average Nusselt number inside the annulus enclosure. The average Nusselt number decreases with increasing Reynolds number and the number of corrugations, while it increases as the Rayleigh number and the volume fraction increase.

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Impact of local elasticity and inner rotating circular cylinder on the magneto‐hydrodynamics forced convection and entropy generation of nanofluid in a U‐shaped vented cavity

Selimefendigil

Öztop

Sheikholeslami

2020

Math Methods in App Sciences

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This study analyzes the effects of a partial elastic wall and rotating circular cylinder on the convective heat transfer of carbon nanotube (CNT)–water nanofluid filled U‐shaped cavity with entropy generation by considering inclined magnetic field effects. Numerical simulation is performed by using ALE with finite element method (FEM). Impacts of various important parameters such as Re number, Ha number, magnetic field orientation, elastic wall size and modulus, angular velocity, and horizontal position of the rotating cylinder on the forced convection are analyzed. When the values of Re number, strength of magnetic field (up to Ha number of 50), and orientation angle are increased, the average Nu value rises while the impact is opposite for higher elastic wall size and horizontal position of the cylinder above 0.4H. When the rotational cylinder effects are considered, enhancement up to 60% is obtained at the highest speed as compared to motionless cylinder case. The average Nu variation is in the range of 9%–10.45% at the highest value when varying the size and modulus of the elastic wall. Flexible wall effects on the average Nu number variation becomes more pronounced when the angular rotational velocity is highest at the clockwise rotation and for the highest Re number. The average Nu number enhancements are 13%–14% at the highest Ha number. The entropy generation rates with varying Ha number, rotational velocity, and location of the cylinder are different for the left and right parts of the domains while impacts of elastic wall properties on the entropy generation rate are slight.

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Effect of rotating cylinder on heat transfer in a square enclosure filled with nanofluids

Cited by 124 publications

References 27 publications

Laminar mixed convection heat transfer of SiC-EG nanofluids in a triangular enclosure with a rotating inner cylinder: simulations based on the measured thermal conductivity and viscosity

Laminar mixed convection heat transfer of SiC-EG nanofluids in a triangular enclosure with a rotating inner cylinder: simulations based on the measured thermal conductivity and viscosity

Numerical study of mixed convection nanofluid in an annulus enclosure between outer rotating cylinder and inner corrugation cylinder

Impact of local elasticity and inner rotating circular cylinder on the magneto‐hydrodynamics forced convection and entropy generation of nanofluid in a U‐shaped vented cavity

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