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  3. a cereal flake is of thickness 2l122mm the density specific...

Question: a cereal flake is of thickness 2l122mm the density specific...

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  1. A cereal flake is of thickness 2L=1.22mm. The density specific heat, and thermal conductivityof the flake are: ρ=700 kg/m3, c=2400 J/(kg K), and k= 0.36 W/(m K). The product is to bebaked by increasing its temperature (Ti=20°C) to convection oven, through which the product is carried on a conveyor moving 0.130 m/s. The oven is L=3 m long and the convection heat transfer coefficient at the product surface and oven air temperature are h= 55 W/(m2 K) andT∞=300°C, respectively.

    (a) Is the flake fully cooked after leaving the conveyer? Assume it needs to be greater than 210°C.

    (b) Management wants to decrease the cereal to 2L=0.8mm to save money. What is the required speed for the conveyer to reach the temperature you got in part (a)?

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