THE TURBULENT GAS FLOW IN REACTORS OF THE TYPE OF THE PEBBLE-BED REACTORS

Journal Article · Sun Apr 01 04:00:00 EST 1962 · Atomkernenergie (West Germany) Merged with Kerntechnik to form Atomkernenerg./Kerntech. Acta Radiol. Changed to Acta Radiol.: Oncol., Radiat. Phys.

OSTI ID:4839637

Kern, E

In the case of gas-cooled reactors, in which the cooling gas is led through channels within the core the flow distribution of the gas plays an important part to attain an optimal cooling effect anwd an even distribution of temperature. Regarding pebble-bed reactors there is no or only a very limited possibility to favorably influence the gas flow. In the central zone of the core the temperature of the gas rises due to the irregular generation of heat by the reactor and due to the existence of a radial flow component. The equations for a turbulent gas flow within a pebble-bed reactor can, based on general considerations, be obtained out of the known relations achieved by experiments for the pressure drop and the heat conductivity in pebble-beds. A non-linear system of partial differential equations was obtained representing a boundary value problem. This system describes the gas flow in pebble-beds in general, with a given distribution of heat sources, that occurs in many physical-chemical experiments, particularly in the field of process engineering. The speed of the gas flow appears in the equations with a fractional power exponent. The heat conductivity of the gas is increased by a factor of 100 to 1000 by the influence of the pebble-bed. An effective heat conductivity of the gas can be defined, being within the range of the heat conductivity of metal. Considering the convective part of the heat transfer, the effective heat conductivity can, however, be neglected. The equations applied to turbulent gas flow in pebble-bed reactors are compared with the assumption given by L. S. Dzung for the case of a laminary gas flow through a pebble-bed. Subject boundary value problem can in general only be solved by means of an electronic computer. The special case of a turbulent gas flow without a radial component can be solved. The results are applied to the gas flow in a pebble-bed reactor. (auth)

• Research Organization: Brown Boveri/Krupp Reaktorbau GmbH, Mannheim , Ger.
• NSA Number: NSA-16-020006
• OSTI ID: 4839637
• Journal Information: Atomkernenergie (West Germany) Merged with Kerntechnik to form Atomkernenerg./Kerntech. Acta Radiol. Changed to Acta Radiol.: Oncol., Radiat. Phys., Journal Name: Atomkernenergie (West Germany) Merged with Kerntechnik to form Atomkernenerg./Kerntech. Acta Radiol. Changed to Acta Radiol.: Oncol., Radiat. Phys. Vol. Vol: 7; ISSN ATKEA
• Country of Publication: Country unknown/Code not available
• Language: German

Related Subjects

COMPUTERS
DISTRIBUTION
EQUATIONS
FUELS
GAS COOLANT
GAS FLOW
HEAT TRANSFER
PBR
PEBBLE BED
PELLETS
POWER PLANTS
PRESSURE
PROGRAMMING
REACTOR CORE
REACTOR TECHNOLOGY
REACTORS
SPHERES
TEMPERATURE
THERMAL CONDUCTIVITY
TURBULENCE