Thermal oscillations downstream of an elbow in stratified pipe flow
In previously published papers, the test geometry, test methodology and the scope of the thermal transient induced pipe stratification studies at Argonne National Laboratory (ANL) were explained. In these prior studies, limited fluid temperature data from elbow inlet and exit plane thermocouples indicated the presence of large-amplitude thermal fluctuations for conditions in which the horizontal pipe upstream of the elbow developed stratified flow induced by a pipe entrant thermal transient. Under severe transient conditions, thermal oscillations of amplitude of almost 70 percent of the pipe inlet transient temperature change were observed in the bulk flow. TC data and accompanying flow visualization test results showed that the largest near wall thermal oscillations were located within and immediately downstream of the elbow. The thermal oscillations if they are of large enough amplitude, of the appropriate frequency, and of sufficiently long duration can cause thermal stripping and thermal-fatigue stress cracking in the elbow region. A specially instrumented test section was fabricated to study these thermal fluctuations.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6837075
- Report Number(s):
- CONF-840614-27; ON: DE84006550
- Resource Relation:
- Conference: Annual meeting of the American Nuclear Society, New Orleans, LA, USA, 3 Jun 1984; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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PIPES
HEAT TRANSFER
HYDRAULICS
POWER REACTORS
PRIMARY COOLANT CIRCUITS
TRANSIENTS
OSCILLATIONS
REACTOR SAFETY
TEMPERATURE GRADIENTS
TEST FACILITIES
COOLING SYSTEMS
ENERGY SYSTEMS
ENERGY TRANSFER
FLUID MECHANICS
MECHANICS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
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220900* - Nuclear Reactor Technology- Reactor Safety