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The supercritical carbon dioxide flow under forced convection has been visualized by shadowgraph and Shrielen interferometer techniques. The fluid was heated from one wall of the vertical rectangular test section. Dark fluid masses of 1-2mm in width and height were observed when the bulk fluid temperature was near the pseudo-critical point and the heat flux exceeded a certain value. The mass was considered to be the high temperature (low density) fluid, showing the non-equilibrium. Because of the supercritical condition, the boundary of the mass was vague and transformable. The mass characteristics were quite different from that of vapor void under sub-critical conditions.

Visualization Study on Forced Convection Heat Transfer of Super Critical Carbon Dioxide