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Unsteady two-dimentional natural convection of air is studied, which is caused in a holizontal circular cylinder when the pressure in it is decreased stepwis The air velocity at the center of the cylinder is measured by laser Doppler velocimeter and the flow pattern on a cross section perpendicular to the cylinder axis is visualized by tracer method. The natural convection flow has been known to grow at first and then die down gradually for low Gr number, but to oscilate two or three times for high Gr. In the Gr range of 10 3-8×10 5 the flow pattern is symmetric and no turbulent flow appears.

Unsteasy two-dimentional natural convection of air in a holizontal circular cylinder.