Abstract
The natural convective heat transfer across an annulus with irregular boundaries was studied using a Mach-Zehnder interferometer. The annulus was formed by an inner hexagonal cylinder and an outer concentric circular cylinder. This configuration models, in two dimensions, a liquid metal fast breeder reactor spent fuel subassembly inside a shipping container. During the test, the annulus was filled with a single gas, either neon, air, argon, krypton, or xenon, at a pressure of about 0.5 MPa. From temperature measurements, both local and mean Nusselt numbers (NuΔ) at the surface of the inner cylinder were evaluated as a function of the Rayleigh number (RaR) and angular location (Δ is the maximum gap width). The data correlation for the mean Nusselt and Rayleigh numbers is given by NuΔ = 0.794RaR0.25. The local heat transfer changes nonmonotonically from the bottom to the top of the hexagonal cylinder. For RaR ≥ 8.15 × 102 the flow in the upper half of the annulus was always unsteady while that in the lower half was steady.
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