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.     

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.     

A study of the possibilities of controlling the hydrodynamics of a fluidized bed to intensify external heat exchange

The influence of various inserts, controlling the motion of gas bubbles in the fluidized bed, on external heat transfer from the walls of the apparatus and from cylinders submerged in the bed is studied experimentally.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 34, No. 4, pp. 600–603, April, 1978.     

Experimental investigation of the radiant and conductive-convective components of external heat exchange in a high-temperature fluidized bed

The results of the experimental investigation of the components of complex external heat exchange in a high-temperature fluidized bed, by means of a radiometer and two calorimeters with a different degree of surface blackness, are given.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 36, No. 3, pp. 409–415, March, 1979.     

Heat exchange and hydrodynamics during boiling on a horizontal tube bundle in a fluidized bed of solid particles

The results are given on the experimental study of heat transfer and hydrodynamics with boiling on a horizontal tube bundle located in a dispersed bed of solid particles and of this process hydrodynamics simulation by gas bubbling within the fluid filtration rate variation via the bed (0–3.5)v_zi.f. An analysis and correlation of experimental results are presented.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 43, No. 5, pp. 718–727, November, 1982.     

Study of heat exchange in a bed fluidized with steam

Experimental data is presented on heat exchange between a water-cooled coil and a bed fluidized with steam.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 42, No. 6, pp. 898–902, June, 1982.     

Mechanism of heat exchange between surfaces and a fluidized bed

Heat exchange between surfaces and fluidized beds is analyzed in terms of a solution for a problem with boundary conditions of the 1-st and 4-th kinds.     

Circulation model for describing mixing of solid particles in a fluidized bed

We present experimental response curves for the pulsed introduction of labeled (heated) particles into a fluidized system with a noncireulating solid phase, and compare these curves with those calculated by using the circulation and diffusion models.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 46, No. 5, pp. 820–824, May, 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.     

Model for heat exchange between a well-developed fluidized bed and a surface within the bed

A physical model for heat exchange between a fluidized bed and a surface in contact with it is proposed and discussed. The heat exchange is due to heat transfer by oscillating particles.     

Hydrodynamics and external heat exchange of a spouting flowing bed

Results of investigation of the hydrodynamics and the external heat exchange of a spouting flowing bed in a continuous-action apparatus are presented. The phase diagrams, heat-exchange characteristics, and rational arrangement of the heat exchangers in this apparatus were determined. The results obtained have been brought up to the level of new technical solutions and tested in the industry.     

Determination of heat transfer coefficients in a fluidized bed at variable flow velocity

On the basis of an empirical expression for calculating the local heat transfer coefficients the authors obtain an equation for the average heat transfer coefficients over the height of a fluidized bed.     

Choice of optimum particle diameter for heat exchange in a fluidized bed

It was shown experimentally and by calculation that in heat transfer between an isothermal wall and a fluidized bed with all the heat removed by the fluidizing agent, the assumed transfer coefficientas and the maximum flux Q vary widely with increase in particle size of fine grained materials.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 25, No. 5, pp. 800–806, November, 1973.     

Study of heat exchange between a model particle and a fluidized bed

An experimental study is made of heat exchange between an unsecured model particle and a fluidized bed. The test data is generalized with a dimensionless relation.     

Investigation of heat exchange in a countercurrent apparatus with fluidized bed of intermediate heat carrier

Heat exchange between two oppositely flowing heat carriers was experimentally ' investigated. The obtained data agree with the results of theoretical investigation [1].Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 38, No. 6, pp. 972–975, June, 1980.     

Analysis of the horizontal effective thermal conductivity of a fluidized alumina bed under steady-state conditions

A critical relation is derived for calculating the thermal conductivity of a fluidized alumina bed. Based on the solution to the equation, formulas are then derived for evaluting the nonuniformity factor of the temperature field in a fluidization chamber which is heated around its walls.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 21, No. 2, pp. 301–308, August, 1971.     

Macroscopic pattern of mixing of solid particles in columns of units with a fluidized bed

The circulation model is used to analyze the effect of the scale factor on the laws governing the mixing of solid particles.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 56, No. 6, pp. 948–953, June, 1989.     

Characteristics of external heat transfer in a fluidization bed of coarse particles

Results are shown of an experimental study concerning the heat transfer in a fluidization bed (2–13 mm) of particles, with a cylindrical thermoprobe used for measurements. A predominance of the convective component in the heat-transfer coefficient has been confirmed in the case of coarse particles. Acriterial formula is proposed for calculating the coefficient of external heat transfer in a fluidization bed with the Archimedes number Ar=1.4·10⁵–3.0·10⁸.Translated from Inzhenemo-Fizicheskii Zhurnal, Vol. 24, No. 4, pp. 589–593, April, 1973.     

Investigation of heat transfer in the space above an inhomogeneous fluidized bed

Heat transfer from the rarefied to the dense phase of a fluidized bed by feeding a stream of hot air to the rarefied phase (space above the bed) was investigated.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 30, No. 1, pp. 14–17, January, 1976.