Numerical investigation of pure mixed convection in a ferrofluid-filled lid-driven cavity for different heater configurations

Rabbi, Khan Md.; Saha, Sourav; Mojumder, Satyajit; Rahman, M. M.; Saidur, R.; Ibrahim, Talaat A.

doi:10.1016/j.aej.2015.12.021

Cited by 56 publications

(14 citation statements)

References 43 publications

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“…This model considers that the nanoparticles have a spherical configuration and all are similar, and their diameters have a normal distribution. 5,12,16,17,20,27,34,39,48,51,52 Cu nanoparticles have high thermal conductivity and moderate density as compared with another metallic nanoparticles such as Al 2 O 3 , Ag, and TiO 2 . The spherical shape offers a large surface area, which permits additional heat transfer.…”

Section: Geometry Description and The Mathematical Modelmentioning

confidence: 99%

“…They concluded that the average Nusselt number was observed to be increased with an increase in Richardson and Reynolds numbers. Rabbi et al 39 presented a numerical investigation of the MHD mixed convection in a square lid‐driven cavity filled with a ferrofluid for two different heater configurations. It was found that the heat transfer was enhanced for a high Richardson number.…”

Section: Introductionmentioning

confidence: 99%

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Mixed convection of nanofluid in a square enclosure with a hot bottom wall and a conductive half‐immersed rotating circular cylinder

et al. 2020

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In this study. The mixed convection in a square enclosure with a hot bottom wall and a conductive half-immersed rotating cylinder from its top wall is investigated numerically. The enclosure is filled with a copper-water nanofluid. The upper half of the cylinder is cooled by the surrounding air, whereas its solid lower half is exposed to the nanofluid. The two left and right sidewalls of the enclosure, together with

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Section: Geometry Description and The Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mixed convection of nanofluid in a square enclosure with a hot bottom wall and a conductive half‐immersed rotating circular cylinder

et al. 2020

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“…Lavrora [24] presented numerical methods for predicting static axisymmetric shapes of ferro uids. Rabbia et al [25] also numerically studied the heat transfer of ferro uids in a lid-driven cavity.…”

Section: Introductionmentioning

confidence: 99%

Ferrofluid appendages: Ferrofluid vortex container - A numerical investigation of free surface shape and vortex flow in ferrofluids for different relative densities

Chekab

Ghadimi

2017

Scientia Iranica

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Abstract. The use of ferro uids as shapeable external appendage to a submerged body and as a mean of vortex ow induction is studied in this paper. Ansys-CFX numerical results are validated against analytical problems and used to analyze the ferro uid free surface shape a ected by gravity, di erent magnets, and di erent densities of the surrounding non-magnetic uids. It is demonstrated that the height, width, and curvature of ferro uid can be controlled by magnet size and strength. It is also observed that ferro uid mass loss may occur due to gravity, which should be addressed in designing a uid appendage. Subsequently, vortex production inside the ferro uid is investigated via a shear ow on the magnet. It is shown that ferro uid can contain complex vortices while being shaped by the magnetic eld, gravity, and the vortices. It is also observed that vortices inside the ferro uid a ect the ow of the surrounding uid. Additionally, the e ects of surface tension and viscosity are brie y analyzed to roughly show the importance of these parameters for further works. Overall, it is concluded that using ferro uids as appendages for shaping and controlling uid ow around submerged bodies seems to be practical and calls for more attention.

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“…Different aspects of ferrofluid flows were analytically and numerically investigated by Shliomis et al (1988) and Shliomis (2001a, b) who focused on improving the equations of ferrohydrodynamics and ferrofluids magnetization and relaxation behavior, Lavrora (2006) who presented numerical methods for predicting static axisymmetric shapes of ferrofluids and Rabbi et al (2016) who numerically studied the heat transfer of ferrofluids in a lid-driven cavity, among many others.…”

Section: Introductionmentioning

confidence: 99%

Ferrofluid Appendages: Fluid Fins, a Numerical Investigation on the Feasibility of using Fluids as Shapeable Propulsive Appendages

Chekab

Ghadimi

2017

JAFM

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The present study focuses on the feasibility of using fluids, and in particular magnetic fluids, as "Fluid Structures" in designing external appendages for the submerged bodies and propulsive fins as a practical example. After reviewing the literature of the mathematical simulation of magnetic fluids and their applications, the concept of "Fluid Structures" and "Fluid Fins" are briefly introduced. The validation of the numerical solver against analytical solutions is presented and acceptable error of 1.21% up to 2.29% is estimated. Subsequently, the initial shaping of the ferrofluid as an external fluid fin, using three combinations of internal magnetic actuators, is presented which makes the way to the oscillating motion of the obtained fin, by producing a periodically changing magnetic field. It is demonstrated that the shape of the fluid fin is almost the replica of the magnetic field. On the other hand, it is illustrated that a fluid fin with a size under 0.005 m on a circular submerged body of 1cm diameter could produce 0.0158 N force which is a high thrust force relative to the size of the body and the fin. Based on the obtained results, one may conclude that, when a "Fluid Fin" is capable of producing this amount of thrust, other fluid appendages could be scientifically contemplated and practically designed.

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Numerical investigation of pure mixed convection in a ferrofluid-filled lid-driven cavity for different heater configurations

Cited by 56 publications

References 43 publications

Mixed convection of nanofluid in a square enclosure with a hot bottom wall and a conductive half‐immersed rotating circular cylinder

Mixed convection of nanofluid in a square enclosure with a hot bottom wall and a conductive half‐immersed rotating circular cylinder

Ferrofluid appendages: Ferrofluid vortex container - A numerical investigation of free surface shape and vortex flow in ferrofluids for different relative densities

Ferrofluid Appendages: Fluid Fins, a Numerical Investigation on the Feasibility of using Fluids as Shapeable Propulsive Appendages

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