A product containing 20% solids of molecular weight 75 g is placed in a cylindri

Question

A product containing 20% solids of molecular weight 75 g is placed in a cylindrical container (height = 60 cm, radius = 6 cm) and is being frozen in a blast freezer that operates at -40 Celsius. The convective heat transfer coefficient between the product and the air in the freezer is 400 W/m^2*K. If the density and thermal conductivity of the product are 1000 kg/m^3 and 0.6 W/m*K respectively, determine the time taken to freeze the product if the product is placed in the freezer when it is at its initial freezing point.

Explanation / Answer

Now, all of the heat removed at the freezing boundary must be transmitted to the surface through the frozen layer; if the frozen layer is in the steady-state condition we have:

                                        q = (T

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