On the theory of external heat transfer in a fluidization bed

The fundamental equations of the packet theory are transformed and critically analyzed, whereupon the concepts pertaining to the mechanism of external heat transfer in a fluid ization bed are further refined on the basis of new test data.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 25, No. 4, pp. 589–593, October, 1973.     

Interphase heat transfer in a fluidization bed

Results are shown of an experimental and analytical study concerning the heat transfer from an anisothermal jet to a fluidization bed, and a model is proposed to describe this heat transfer.Translated from Inzhenerno-FizLcheskii Zhurnal, Vol. 25, No. 4, pp. 581–588, October, 1973.     

A study of the heat transfer in a moderated fluidization bed

Measurements were made to determine the coefficient of heat transfer between a vertical cylindrical surface and a fluidization bed with eight different kinds of fixed packing. The data for the maximum heat transfer coefficient have been generalized into design formulas.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 25, No. 1, pp. 50–55, July, 1973.     

Experimental study of the heat transfer pattern in a diluted fluidization bed

An experiment was performed to establish a relation between the heightwise distribution of porosity and the heat-transfer coefficient in a diluted fluidization bed.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 22, No. 5, pp. 783–788, May, 1972.     

Some problems of heat transfer and hydrodynamics in a fluidization bed with small-volume packing

A study was made concerning the effect of four kinds of small-volume packing on the expansion of a fluidization bed, on its effective thermal diffusivity, and on the heat transfer between the bed and an immersed surface. The test results for two materials have been generalized in terms of empirical formulas.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 23, No. 4, pp. 635–640, October, 1972.     

A study of the heat transfer between a liquid fluidization bed and a surface

An experimental study was made concerning the heat transfer between a cylinder and a liquid fluidization bed inside an annular channel. This study included the effect of the charge material and its fractional composition, also of the filtration rate and of the thermo-properties of the fluidizing agent.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 24, No. 2, pp. 201–204, February, 1973.     

Packet model of external heat transfer for a fluidized bed

A modification is proposed for the packet model of external heat transfer of a fluidized bed. The modified model considers heat exchange between the particles and the gas flowing through the packet formed by the particles.Translated from Inzhnerno-Fizicheskii Zhurnal, Vol. 47, No. 5, pp. 789–796, November, 1984.     

The mechanism of heat transfer of particles in a fluidized bed

The relationship between the contact and convective-conductive components of the heat flux in the heating of particles in a fluidized bed is examined.     

Radiation of a bed of coarse alumina particles

Spectral and integral emissivity is calculated of a semiinfinite bed of alumina particles with diameters up to 1 mm which are at high temperatures.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 31, No. 6, pp. 996–999, December, 1976.     

Some problems of desiccation in a fluidization bed with heat cycling

Several variants of the desiccation process in a fluidization bed with heat cycling are considered, and a method is developed for determining the desiccation factor during the periods of heating and cooling; relations are also derived for the design of the desiccation process in various modes of operation.Translated from Ihzhenerno-Fizicheskii Zhurnal, Vol. 25, No. 4, pp. 607–615, October, 1973.     

Particle transfer and external heat exchange in the space above a polydisperse fluidized bed

The entrainment of particles from a polydisperse fluidized bed in a column 0.7 m in diameter with a bubble-cap gas distributor is investigated. Test data on external heat exchange in the space above the bed are obtained and generalized.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 53, No. 3, pp. 383–388, September, 1987.     

Investigating the fluidization of disk-like particles in a fluidized bed using CFD-DEM simulation

Fluidization of monodispersed disk-like particles with different aspect ratios in the fluidized bed is simulated by CFD-DEM, with disk-like particles being modeled by the super-ellipsoids. The relatively comprehensive investigations are performed in order to understand the fluidization behaviors of disk-like particles and to evaluate how the aspect ratio influences the fluidization. The results obtained demonstrate that disk-like particles with a larger aspect ratio possess stronger particle movement and more apparent fluidization. Comparisons between spherical particles and disk-like particles elucidate their differences in the fluidization behavior. Particle orientation is also investigated in this paper due to its important influence on the fluidization. Particles possess different preferred orientations in the static bed and in the fluidization state, and a reduced aspect ratio can drive particles to be in the preferred orientation. The existence of the walls will prompt particles to align their cross sections to be parallel to the plane of the walls.     

Influence of aerodynamics of a circulation fluidized bed on intensity of external heat transfer

The authors present results of an experimental investigation of external heat transfer over the height of a circulation fluidized bed.Translated from Inzhenerno-fizicheskii Zhurnal, Vol. 61, No. 5, pp. 778–781, November, 1991.     

Characteristics of heat transfer from a surface to a fluidized bed under pressure

The effect of pressure within the 0–30 atm g range on the heat transfer from a surface to a fluidized bed has been studied at temperatures within the 150–1000°C range and with a gas of various compositions.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 22, No. 5, pp. 789–794, May, 1972.     

Mass transfer at a moving particle in a fluidized bed of coarse material

An experimental study has been made of mass transfer to a moving particle in the fluidized bed of coarse inert material. The experimental results are presented in terms of dimensionless relationships.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 47, No. 2, pp. 235–242, August, 1984.     

Radiative heat transfer in a flat nonisothermal bed

A general formula is derived for the radiation flux impinging on the surface of the bed. The problem of self-radiation of a non-thick nonisothermal bed is solved, as well as the problem of self-radiation of a semi-infinite medium whose temperature remains constant everywhere except for a non-thick boundary layer.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 17, No. 5, pp. 836–840, November, 1969.     

Nonsteady-state heat transfer in a high-temperature granular bed

Specific features of heat transfer in a high-temperature granular bed are studied based on a two-region model which takes into account the existence of an elevated porosity area.Academic Scientific Complex A. V. Luikov Heat and Mass Transfer Institute of the Academy of Sciences of Belarus, Minsk. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 64, No. 4, pp. 421–425, April, 1993.     

Convective heat transfer in a dynamic two-phase bed

An electrochemical method is used to investigate the average mass transfer coefficients and it is shown that the experimental data are correlated very satisfactorily by a relationship [4, 5] obtained on the assumption of no evaporation at the surface of the liquid film.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 20, No. 6, pp. 1060–1065, June, 1971.     

Mathematical modeling of convective heat and mass transfer in the drying of solid particles in a bed

A closed system of equations is proposed for calculating convective heat and mass transfer in the drying of solid particles by a gaseous heat transfer agent in a moving bed. As an example, the operation of a belt-type dryer with crossed interaction of a drying agent and a bed of fruit cut into circular slices is considered. Results of a numerical solution of the problem are presented in figures.Institute of Engineering Thermophysics, Academy of Sciences of Ukraine, Kiev. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 67, Nos. 1–2, pp. 48–53, July–August, 1994.     

Mechanism of external heat exchange in a nonuniform fluidized bed

The results of an experimental study of the porosity fluctuations in the boundary zone of a nonuniform fluidized bed are presented.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 29, No. 2, pp. 220–224, August, 1975.