Abstract

The natural convection of water in vertical narrow annural gaps is visualized by using polystirene particles and temperature distributions of a inner wall are measured. The present study shows mainly flow patterns during unsteady state. Several local circulating flows occur near the high temperature surface after a few minutes of heat beginning and that flows combine and large circulating flow occurs. The two pair of circulating flows are formed along the circumferential and vertical direction with the passage of time and change one pair after the long time.

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