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Friday, August 7, 2020 | History

2 edition of Heat transfer in magnetic fluids at low Reynolds number found in the catalog.

Heat transfer in magnetic fluids at low Reynolds number

Sang Hyouk Choi

Heat transfer in magnetic fluids at low Reynolds number

by Sang Hyouk Choi

  • 371 Want to read
  • 11 Currently reading

Published .
Written in English

    Subjects:
  • Magnetic fluids.,
  • Reynolds number.

  • Edition Notes

    Statementby Sang Hyouk Choi.
    The Physical Object
    Pagination[15] 159 leaves, bound :
    Number of Pages159
    ID Numbers
    Open LibraryOL15066080M

    Magnetohydrodynamics (MHD; also magneto-fluid dynamics or hydro­magnetics) is the study of the magnetic properties and behaviour of electrically conducting es of such magneto­fluids include plasmas, liquid metals, salt water, and word "magneto­hydro­dynamics" is derived from magneto-meaning magnetic field, hydro-meaning water, and dynamics meaning movement. American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA

    Heat is defined in physics as the transfer of thermal energy across a well-defined boundary around a thermodynamic thermodynamic free energy is the amount of work that a thermodynamic system can perform. Enthalpy is a thermodynamic potential, designated by the letter "H", that is the sum of the internal energy of the system (U) plus the product of pressure (P) and volume (V). Electromagnetic (EM) flow meters are used to measure volume flow rates of electrically conductive fluids (e.g., low magnetic Reynolds number flows of seawater, milk, etc.) in pipe flows. The possibility of using a modified form of EM flow meter to nonobtrusively measure boundary-layer flow characteristics is analytically investigated in this paper.

    Effect of magnetic field on near-wall coherent structures and heat transfer in magnetohydrodynamic turbulent channel flow of low Prandtl number fluids. International Journal of Heat and Mass Transfer, Vol. 54, Issue. , p. R.K. Shah, A.L. London, in Laminar Flow Forced Convection in Ducts, 3 APPLICATION TO COMPACT HEAT EXCHANGERS. A typical value for the Grashof number in a compact heat exchanger, such as the air flow side of an automobile radiator, is 60– With Pr/(L/D) of the order of 10 −2, the abscissa magnitude in Fig. is of the order of one, and is off the scale; Fig. is based on the.


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Heat transfer in magnetic fluids at low Reynolds number by Sang Hyouk Choi Download PDF EPUB FB2

The Reynolds number (Re) helps predict flow patterns in different fluid flow low Reynolds numbers, flows tend to be dominated by laminar (sheet-like) flow, while at high Reynolds numbers flows tend to be turbulence results from differences in the fluid's speed and direction, which may sometimes intersect or even move counter to the overall direction of the flow.

Heat transfer in magnetic fluids at low Reynolds number magnetic Rayleigh number.\ud The second part of the study consisted of an experimental investigation\ud at the thermal entry region of flow caused by a change in\ud tube wall heat flux and a numerical solution to the governing equations\ud for the same problem.

Because of the low. Brunn [26] studied heat or mass transfer from a sphere in a low-Reynoldsnumber flow. Feng and Michaelides [27] reported on mass and heat transfer from spheres at low Reynolds.

Numerical investigation of heat transfer phenomena of low Reynolds number nano-fluid flow over an isothermal cylinder is presented in this paper. Steady state governing equations (continuity, N–S and energy equations) have been solved using finite volume : Yacine Khelili, Abderrazak Allali, Rafik Bouakkaz.

On averaging the heat flux at all points on the surface of the sphere we get the mean Nusselt number, given by the Eq.(19).As N increases the degradation of heat transfer is found up to a critical value of N, beyond which there is an increase of heat tions for liquid lithium with P r = for R e = 5 and 40 are made and plotted in Fig.

(12).Cited by: 7. Heat transfer enhances with an increase in the Reynolds number and the magnetic number; while the opposite trend is observed with the Hartmann number. Figure Effects of magnetic number, Hartmann number, and Reynolds number on local Nusselt number N. We investigated the influence of heat and mass transfer on the peristaltic flow of magnetohydrodynamic Eyring-Powell fluid under low Reynolds number and long-wavelength approximation.

The fluid flows between two infinite cylinders; the inner tube is uniform, rigid, and rest, while the outer flexible tube has a sinusoidal wave traveling down its wall.

The governing equations are solved. When a magnetic fluid is applied to heat transfer applications such as cooling system for a micromachine[1], it is necessary to perform detailed investigation on the properties of heat transfer of a magnetic fluid under magnetic * Corresponding author.

Tel.: + (ext) ; fax: +   The flow and heat transfer topology of an isothermal cylinder (diameter D) in the wake of another smaller (diameter d) cylinder is numerically investigated for a spacing ratio of L/d = and at a Reynolds number of The governing Navier-Stokes and.

However, at low Reynolds numbers, heat transfer may even be lessened compared to the flow without magnetic field. According to Asfer et al.

[ 20 ], a positive effect appears not before the Reynolds number exceeds a critical value of about for the single-sided magnet arrangement. Laminar and Turbulent Flow []. Laminar Flow: Smooth uninterrupted flow determined by a low Reynolds Reynolds number for a Newtonian fluid is defined as: = where D is a characteristic diameter (such as the diameter of a cylindrical pipe), v is the fluid velocity, is the density, and is the (dynamic) viscosity.

There are several other ways of writing it as well (based on volumetric. The flow around a heated circular cylinder and the wake behind it were studied in wind tunnel flow using two methods of anemometry, i.e., particle image velocimetry (PIV) and cons.

1 The Reynolds Analogy We describe the physical mechanism for the heat transfer coefficient in a turbulent boundary layer because most aerospace vehicle applications have turbulent boundary layers.

The treatment closely follows that in Eckert and Drake (). Very near the wall, the fluid motion is smooth and laminar, and molecular conduction and shear are important. Low Reynolds number heat transfer from a circular cylinder - Volume 32 Issue 1 - C.

Hieber, B. Gebhart. Where, ΔT 1 → the temperature difference between hot and cold fluids at one end of the heat exchanger ΔT 2 → the temperature difference between hot and cold fluids at the other end of the heat exchanger.

LMTD with the Correction factor. However the LMTD is valid only for heat exchanger with one shell pass and one tube pass. For multiple number of shell and tube passes the flow pattern. Dimensionless numbers in fluid mechanics are a set of dimensionless quantities that have an important role in analyzing the behavior of examples include the Reynolds or the Mach numbers, which describe as ratios the relative magnitude of fluid and physical system characteristics, such as density, viscosity, speed of sound, flow speed, etc.

Heat transfer in magnetic fluids at low Reynolds number Public Deposited. study consisted of an experimental investigation at the thermal entry region of flow caused by a change in tube wall heat flux and a numerical solution to the governing equations for the same problem. Because of the low pyromagnetic coefficient of the water-based.

The classical problem of heat and mass transfer from single spheres at low values of the Reynolds number, where the velocity field is given by Stokes' formula, is considered.

It is shown, by the use of a singular perturbation technique, how an expansion may be derived for the Nusselt number Nu in terms of the Péclet number Pe which yields an accurate expression for the rate of transfer of.

The magnetic Reynolds number (R m) is the magnetic analogue of the Reynolds number, a fundamental dimensionless group that occurs in gives an estimate of the relative effects of advection or induction of a magnetic field by the motion of a conducting medium, often a fluid, to magnetic is typically defined by: = ∼.

Heat Transfer (September ) Framing the Impacts of Highly Oscillating Magnetic Field on the Ferrofluid Flow Over a Spinning Disk Considering Nanoparticle Diameter and Solid–Liquid.

Magnetic Reynolds Number Approximation in MHD Natural-Convection Heat Transfer', Numerical Heat Transfer, Part B: Fundamentals,- To link to this article: DOI: /In a fixed or fluidized bed at low particle Reynolds numbers, the overall or effective Sherwood and Nusselt number has been found by many investigators to be much less than unity.

The limiting value of the particle Sherwood or Nusselt number based on local concentration or temperature differences is shown to be equal to or greater than unity.frequency increases the heat transfer up to of % in low Reynolds numbers [ 10 ]. Innocent Nkurikiyimfura had observed that magnetic nano fluids under the influence of magnetic field can transfer the heat through convection more efficiently when compared with the transfer of heat without magnetic field [ 11 ].