Published April 1981 | Version v1
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Velocity and temperature profiles in rough annuli

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Description

Velocity and temperature profiles were measured in an annular flow cross section. Three different rough rods in two outer tubes each were investigated. The slopes of the nondimensional logarithmic velocity profile in both the inner rough zone and the outer smooth zone vary with the Reynolds number. The slopes of the nondimensional temperature profile deviate from a logarithmic line in a large portion of the flow cross section. The turbulent Prandtl number is smaller than one and varies with the distance from the wall. (orig.)

Availability note (English)

MF available from INIS under the Report Number.

Abstract (German)

In einem Ringspalt wurden Geschwindigkeits- und Temperaturprofile gemessen. Dabei wurden drei verschiedene rauhe Staebe jeweils in zwei glatten Aussenrohren untersucht. Die Steigung des logarithmischen Geschwindigkeitsprofils aendert sich sowohl in der glatten Aussen- als auch in der rauhen Innenzone mit der Reynoldszahl. Die Steigung des logarithmischen Temperaturprofils weicht im groessten Teil des Stroemungsquerschnittes von einer logarithmischen Geraden ab. Die turbulente Prandtlzahl ist kleiner als eins und aendert sich mit dem Wandabstand. (orig.)

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Additional details

Publishing Information

Imprint Pagination
92 p.
Report number
KFK--3163

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
12619208
Subject category
S42: ENGINEERING;
Descriptors DEI
ANNULAR SPACE; FLUID FLOW; HEAT TRANSFER; MEASURING METHODS; PRANDTL NUMBER; PRESSURE DROP; REYNOLDS NUMBER; ROUGHNESS; TEMPERATURE DEPENDENCE; TURBULENCE; VELOCITY; VISCOSITY
Descriptors DEC
CONFIGURATION; ENERGY TRANSFER; SURFACE PROPERTIES