Plank’s equation is being used to estimate the convective heat transfer coefficient in a food being frozen in an air-blast freezer. it took a product 20 minutes to freeze in the freezer. the product is in the shape of an infinite cylinder with a diameter of 2 cm. the properties of the product are as follows: thermal conductivity of frozen material = 1.8 w/(m °c), density = 890 (kg/m3), latent heat of fusion = 260 kj/kg, and initial freezing point = -1.9 °c. the initial temperature of the product is 25°c and the air temperature is -35°c. estimate the heat transfer coefficient of the food.
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