FORCED-CONVECTION FREEZING CHARACTERISTICS ALONG THE CONVEX WALL OF ARETURN BEND WITH RECTANGULAR CROSS-SECTION

An experimental study was made of the forced convection freezing chara cteristics on the convex wall of a return bend with a rectangular cros s section. Observations were carried out for duct heights of 17 and 30 mm, a duct width of 300 mm, and a radius of curvature of 159 mm. The convex wall temperature was uniformly maintained below the freezing te mperature of water, and the concave wall was insulated. It was found t hat a stepwise ice layer forms on the convex wall of a return bend and that the step position at the steady-state condition is closely depen dent on both the water flow velocity and the cooling temperature ratio .