Wave instability of nautral convection boundary layer flow adjacent to inclined surfaces is analyzed by a linear theory. The effects of the nonparallelism of the main flow and thermal fields are taken into account in the analysis. Neutral stability results for Prandtl numbers of 0.7 and 7.0 are presented for upward-facing heated surfaces, for angles of inclination ranging from 0 to 90 deg. These results are compared with available analytical wave instability results for small angles of inclination. They are also compared with analytical vortex instability results and with available experimental data.

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