Optimization of heat transfer properties on ferrofluid flow over a stretching sheet in the presence of static magnetic field

Bhandari, Anupam; Husain, Akmal

doi:10.1007/s10973-020-09636-5

Cited by 18 publications

(6 citation statements)

References 35 publications

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“…When a static magnetic field is present, the properties of magnetic body force and rotational viscosity in ferrofluid flow across a stretched sheet were investigated 53 . Maxwell nanofluid flow across a spinning disc with a chemical reaction was investigated 54 . The properties of heat mass transport processes have been examined using thin film deposition of nanofluid over an uneven stretched surface 55 .…”

Section: List Of Symbols ρ Nmentioning

confidence: 99%

Heat transfer and hybrid ferrofluid flow over a nonlinearly stretchable rotating disk under the influence of an alternating magnetic field

Rauf

Mushtaq

Botmart

2022

Sci Rep

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Under the influence of an alternating magnetic field, flow and heat transfer of a ferrofluid flow over a flexible revolving disc are examined. The flow is hampered by the external magnetic field, which is dependent on the alternating magnetic field's frequency. The current work examines the heat transfer and three-dimensional flow of fluid with high viscosity on a spinning disc that is stretched in a radial direction. The governing equations' symmetries are computed using Lie group theory. In the problem, there is a resemblance that can accomplish with radially stretching velocities divided into two categories, specifically, linear and power-law, by imposing limits from the boundary conditions. The literature has already covered linear stretching, but this is the first discussion of power-law stretching. The governing partial differential is turned into an ordinary differential equations system using additional similarity transformations, which are then numerically handled. The results are presented for hybrid alumina–copper/ethylene glycol ($${\text{Al}}_{2} {\text{O}}_{3} - {\text{Cu}}/{\text{EG}}$$ Al 2 O 3 - Cu / EG ) nanofluid. The calculated findings are novel, and it has been seen that they accord quite well with those of the earlier extended literature. It has been found that hybrid nanofluid flow outperforms nanofluid flow in terms of Nusselt number or heat transfer rate. The heat transmission in the fluid is reduced as the Prandtl number is increased. The heat transfer increases as dimensionless magnetic field intensity $$\xi$$ ξ increases. Also, axial velocity and radial velocity decrease as magnetic field intensity increases. As the ferromagnetic interaction parameter is raised, the efficiency of heat transmission decreased. For non-linear stretching with stretching parameter 0 < m < 1, the velocity decreases with the increase in m.

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Section: List Of Symbols ρ Nmentioning

confidence: 99%

Heat transfer and hybrid ferrofluid flow over a nonlinearly stretchable rotating disk under the influence of an alternating magnetic field

Rauf

Mushtaq

Botmart

2022

Sci Rep

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“…A magnetic fluid (MF), a stable colloidal solution, is usually formed by ferromagnetic nanoparticles that are uniformly suspended in a nonmagnetic carrier fluid, utilizing a surfactant [ 1 , 2 ]. It can exhibit fluidity like any other traditional fluids and magnetic properties that are similar to other solid magnetic materials, in the presence of magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Calculation of the Maximum Temperature of Diester-Based Magnetic Fluid Layers in High-Speed Seals

Zhou

Liu

et al. 2023

Nanomaterials

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Magnetic fluids, as smart nanomaterials, have been successfully used in sealing applications and other fields. However, the temperature of magnetic fluids in the sealing gap is a key factor affecting sealing performances, limiting their application in high-speed sealing fields. Since obtaining a direct measurement of the magnetic fluid’s temperature is difficult, due to the small clearance, accurately calculating the maximum temperature of the magnetic fluid layer in high-speed seals is crucial. Herein, a mathematical model for calculating the maximum temperature of the magnetic fluid layer was established, by using a reasonable simplification of high-speed sealing conditions, and the calculation formula was modified by studying the rheological properties of the diester-based magnetic fluid. The results suggest that the calculation of the maximum temperature is influenced by viscous dissipation, and both are related to the rheological characteristics of magnetic fluids. When the influence of rheological properties is ignored, the calculation results are not accurate for higher-velocity seals, but the calculation model applies to lower-velocity seals. When the influence of rheological properties is considered, the calculation results obtained by the corrected formula are more accurate, and they are applicable to both lower- and higher-velocity seals. This work can help us more accurately and conveniently estimate the maximum temperature of magnetic fluids in high-speed seal applications, which is of theoretical and practical research significance for determining sealing performances and thermal designs.

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“…21 For more practical applications, the researchers have studied the flow over rotational geometries for the specific types of nanofluids [22][23][24] 25,26 The researchers have investigated some specific types of ferrofluid flow with heat transfer analysis. [27][28][29][30] Khan et al analyzed the flow of magnetic fluid by a variable thicked surface with entropy generation analysis. 31 Jamil et al investigated the impact of temperature-dependent viscosity and thermal conductivity for heat transfer enhancement for the flow over the rotating cone.…”

Section: Introductionmentioning

confidence: 99%

Entropy generation and heat transfer analysis for ferrofluid flow between two rotating disks with variable conductivity

Bhandari

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Present model analyze the flow and heat transfer of water-based carbon nanotubes (CNTs) [Formula: see text] ferrofluid flow between two radially stretchable rotating disks in the presence of a uniform magnetic field. A study for entropy generation analysis is carried out to measure the irreversibility of the system. Using similarity transformation, the governing equations in the model are transformed into a set of nonlinear coupled differential equations in non-dimensional form. The nonlinear coupled differential equations are solved numerically through the finite element method. Variable viscosity, variable thermal conductivity, thermal radiation, and volume concentration have a crucial role in heat transfer enhancement. The results for the entropy generation rate, velocity distributions, and temperature distribution are graphically presented in the presence of physical and geometrical parameters of the flow. Increasing the values of ferromagnetic interaction number, Reynolds number, and temperature-dependent viscosity enhances the skin friction coefficients on the surface and wall of the lower disk. The local heat transfer rate near the lower disk is reduced in the presence of Harman number, Reynolds number, and Prandtl number. The ferrohydrodynamic flow between two rotating disks might be useful to optimize the use of hybrid nanofluid for liquid seals in rotating machinery.

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Optimization of heat transfer properties on ferrofluid flow over a stretching sheet in the presence of static magnetic field

Cited by 18 publications

References 35 publications

Heat transfer and hybrid ferrofluid flow over a nonlinearly stretchable rotating disk under the influence of an alternating magnetic field

Heat transfer and hybrid ferrofluid flow over a nonlinearly stretchable rotating disk under the influence of an alternating magnetic field

Calculation of the Maximum Temperature of Diester-Based Magnetic Fluid Layers in High-Speed Seals

Entropy generation and heat transfer analysis for ferrofluid flow between two rotating disks with variable conductivity

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