Convective heat transfer in laminar conditions is studied numerically for a Prandtl number Pr = 0.025,representative of liquid lead–bismuth eutectic (LBE). The geometry investigated is a channel with a periodicseries of shallow cavities. Finite-volume simulations are carried out on structured orthogonal curvilineargrids, for ten values of the Reynolds number based on the hydraulic diameter between Rem = 24.9and Rem = 2260. Flow separation and reattachment are observed also at very low Reynolds numbers andwall friction is found to be remarkably unequal at the two walls. In almost all cases investigated, heattransfer rates are smaller than the corresponding flat channel values. Low-Prandtl number heat transferrates, investigated by comparison with Pr = 0.71 results, are large only for uniform wall temperature andvery low Re. Influence of flow separation on local heat transfer rates is discussed, together with the effectof different thermal boundary conditions. Dependency of heat transfer performance on the cavity geometryis also considered.

Numerical simulation of forced convection over a periodic series of rectangular cavities at low Prandtl number / Stalio, Enrico; Angeli, Diego; Barozzi, Giovanni Sebastiano. - In: INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW. - ISSN 0142-727X. - STAMPA. - 32(2011), pp. 1014-1023.

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