Heat transfer in a gas fluidized bed assisted by an alternating electric field

1977 ◽  
Vol 32 (10) ◽  
pp. 1147-1153 ◽  
Author(s):  
R. Elsdon ◽  
C.J. Shearer
Keyword(s):  
Heat Transfer ◽  
Electric Field ◽  
Fluidized Bed ◽  
Alternating Electric Field

Alternating electric field fluidized bed disinfection performance with different types of granular activated carbon

2014 ◽  
Vol 132 ◽  
pp. 70-76 ◽  
Author(s):  
Justina Racyte ◽  
Doekle R. Yntema ◽  
Laura Kazlauskaite ◽  
Anne-Claire Dubois ◽  
Harry Bruning ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Electric Field ◽  
Fluidized Bed ◽  
Granular Activated Carbon ◽  
Alternating Electric Field ◽  
Different Types

Condensation of Freon-114 in the Presence of a Strong Nonuniform, Alternating Electric Field

1970 ◽  
Vol 92 (4) ◽  
pp. 616-620 ◽  
Author(s):  
R. E. Holmes ◽  
A. J. Chapman
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Heat Transfer Coefficient ◽  
Electric Field ◽  
Transfer Coefficient ◽  
Flat Plate ◽  
Transfer Rate ◽  
Reasonable Agreement ◽  
Alternating Electric Field ◽  
The Heat Transfer Coefficient

The condensation of Freon-114 in the presence of a nonuniform, alternating, 60-cycle, electric field was examined experimentally. The condensing surface was a grounded, cooled flat plate, and the electric field was produced by applying a voltage to a second plate placed above the first. Voltages up to 60 kv were imposed, and nonuniformities in the field were created by varying the angle between the plates. Analytical predictions were made of the expected heat-transfer rate, and reasonable agreement with the experimental data was obtained for voltages less than 40 kv. Above 40 kv the results were unpredictable, but increases in the heat-transfer coefficient as high as ten times that for no field were obtained.

Effect of a non-uniform alternating electric field on the thermal boundary layer near a heated vertical plate

1971 ◽  
Vol 49 (4) ◽  
pp. 693-703 ◽  
Author(s):  
Robert J. Turnbull
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Electric Field ◽  
Thermal Boundary Layer ◽  
Vertical Plate ◽  
Uniform Electric Field ◽  
Heated Plate ◽  
Uniform Field ◽  
Nusselt Numbers ◽  
Alternating Electric Field

A thermal boundary layer is established by heating a vertical plate in a dielectric liquid. An alternating voltage is applied between the heated plate and another plate which is not parallel to the heated plate. This voltage produces a non-uni- form electric field which in turn produces electrical forces acting on the gradients in dielectric permittivity which result from the temperature gradients. These electrical forces alter the boundary layer. In this paper approximate equations are developed which allow one to calculate the boundary-layer,thickness, velocity, and Nusselt numbers for the boundary layer in the presence of the non-uniform electric field. Numerical calculations show that the heat-transfer coefficient can be either increased or decreased by the non-uniform field, depending on whether the field is strongest at the top or bottom of the plates and also on the field strength. Experiments were performed which demonstrate the change in heat transfer caused by the non-uniform field.

RAPID HEAT TRANSFER MANIPULATION OF FINE POWDER BY USE OF A FLUIDIZED BED

1994 ◽  
Author(s):  
Shoichiro Fukusako ◽  
Masahiko Yamada ◽  
Akihiko Horibe ◽  
T. Ohmichi
Keyword(s):  
Heat Transfer ◽  
Fluidized Bed ◽  
Fine Powder

INTENSIFICATION OF SURFACE TO BED HEAT TRANSFER IN A FLUIDIZED BED AT CONTROLLED GAS DISTRIBUTION

1978 ◽  
Author(s):  
L.I. Frenkel ◽  
N. B. Kondukov ◽  
B. V. Pankov ◽  
N.Ya. Romanenko ◽  
V.P. Tarov
Keyword(s):  
Heat Transfer ◽  
Fluidized Bed ◽  
Gas Distribution

Formation of Regular Domain Structures in Quenched Ferroelectrics Under the Influence of an External High-frequency Electric Field

2019 ◽  
Vol 9 (3) ◽  
pp. 344-352 ◽  
Author(s):  
L.I. Stefanovich ◽  
O.Y. Mazur ◽  
V.V. Sobolev
Keyword(s):  
Lithium Niobate ◽  
Electric Field ◽  
Domain Structure ◽  
High Frequency ◽  
Evolution Equations ◽  
Regular Domain ◽  
Field Frequency ◽  
Domain Structures ◽  
Alternating Electric Field ◽  
Lithium Niobate Crystals

Introduction: Within the framework of the phenomenological theory of phase transitions of the second kind of Ginzburg-Landau, the kinetics of ordering of a rapidly quenched highly nonequilibrium domain structure is considered using the lithium tantalate and lithium niobate crystals as an example. Experimental: Using the statistical approach, evolution equations describing the formation of the domain structure under the influence of a high-frequency alternating electric field in the form of a standing wave were obtained. Numerical analysis has shown the possibility of forming thermodynamically stable mono- and polydomain structures. It turned out that the process of relaxation of the system to the state of thermodynamic equilibrium can proceed directly or with the formation of intermediate quasi-stationary polydomain asymmetric phases. Results: It is shown that the formation of Regular Domain Structures (RDS) is of a threshold character and occurs under the influence of an alternating electric field with an amplitude less than the critical value, whose value depends on the field frequency. The conditions for the formation of RDSs with a micrometer spatial scale were determined. Conclusion: As shown by numerical studies, the RDSs obtained retain their stability, i.e. do not disappear even after turning off the external electric field. Qualitative analysis using lithium niobate crystals as an example has shown the possibility of RDSs formation in high-frequency fields with small amplitude under resonance conditions

Sign in / Sign up

Export Citation Format

Share Document