Derive an expression for the total solidification time. Apply the result to the following cases: Ra=10cm, Rb=25cm, To=-2

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Derive An Expression For The Total Solidification Time Apply The Result To The Following Cases Ra 10cm Rb 25cm To 2 1 (211.75 KiB) Viewed 15 times

Derive an expression for the total solidification time. Apply the result to the following cases: Ra=10cm, Rb=25cm, To=-20°C. This is little bit different question but the figure is similar to another question. Please carefully help me to solve this one. 6.5 An old fashioned ice cream kit consists of two concentric cylinders of radii R, and R. The inner cylinder is filled with milk and ice cream ingredients while the space between the two cylinders is filled with an ice-brine mixture. To expedite the process, the inner cylinder is manually rotated. Assume that the surface of the cylinder is at the brine temperature T, and that Ste <0.1, derive an expression for the total solidification time. Apply the result to the following case: R₁ =10cm, R₂ = 25cm, T = -20°C. Assume that ice cream has the same properties as ice. = 2093 J/kg-°C, k= 2.21 W/m-°C, L=333730J/kg and p=916.8 kg/m³ milk ice cream ico-brine R R₂