Analytical studies on the impact of using repeated-rib roughness in LMR (Liquid Metal Reactor) decay heat removal systems

Conference · Fri Jan 01 00:00:00 EST 1988

OSTI ID:6752150

Obot, N T; Tessier, J H; Pedersen, D R

A numerical study was carried out to determine the effects of roughness on the thermal performance of Liquid Metal Reactor (LMR) decay heat removal systems for a range of possible design configurations and operating conditions. The ranges covered for relative rib height (e/D/sub h/), relative pitch (p/e) and flow attack angle were 0.026--0.103, 5--20 and 0--90 degrees, successively. The heat flux was varied between 1.1 and 21.5 kW/m/sup 2/ (0.1 and 2.0 kW/ft/sup 2/). Calculations were made for three cases: smooth duct with no ribs, ribs on both the guard vessel and collector wall, and ribs on the collector wall only. The results indicate that significant benefits, amounting to nearly two-fold reductions in guard vessel and collector wall temperatures, can be realized by placing repeated ribs on both the guard vessel and the collector wall. The magnitudes of the reduction in the reactor vessel temperature are considerably smaller. In general, the level of improvement, be it with respect to temperature or heat flux, is only mildly affected by changes in rib height or pitch but exhibits greater sensitivity to the assumed value for the system form loss. When the ribs are placed only on the collector wall, the heat removal capability is substantially reduced.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6752150
• Report Number(s): CONF-881120-1; ON: DE88010051; TRN: 88-035561
• Resource Relation: Conference: ASME winter annual meeting, Chicago, IL, USA, 28 Nov 1988; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

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