THERMAL SCIENCE

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Jordan Y. Hristov

FRICTION FACTORS AND INTERNAL FLOW LENGTH SCALES OF GAS-SOLID MAGNETICALLY STABILIZED BEDS IN AXIAL FIELDS: SCALING AND APPLICATIONS TO BED-TO-SURFACE HEAT TRANSFER

ABSTRACT
Friction factors and internal flow length scales of gas-solid magnetically stabilized beds are discussed. Pressure drop and expansion data of beds stabilized by axial magnetic fields are used. The concept of a variable friction factor of fluid-driven deformable packed bed is discussed. Scaling relationships of the internal flow length scale and the bed overall porosity are developed through three approaches: (1) fluidization approach concerning a length scale proportional to the particle size, (2) packed bed approach based on a hydraulic diameters as a length scale, and (3) porous media approach based on the Forchheimer equation. The main result is that the bed length scale ~e", irrespective of the model used, where n is the exponent of the Richardson-Zaki scaling law. These scaling estimates are used to explain the magnetic field effects on bed-to-surface heat transfer coefficients.
KEYWORDS
fluidization, magnetic field stabilized bed, friction factor, scaling, Richardson-Zaki law, bed-to surface heat transfer
PAPER SUBMITTED: 2004-03-29
PAPER REVISED: 2005-01-11
PAPER ACCEPTED: 2005-02-15
DOI REFERENCE: https://doi.org/10.2298/TSCI0501073H
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2005, VOLUME 9, ISSUE Issue 1, PAGES [73 - 98]
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Friction factors and internal flow length scales of gas-solid magnetically stabilized beds in axial fields: Scaling and applications to bed-to-surface heat transfer

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