In a fruit exporting company, a cold blow is given to The fruit by placing them on a flat tray on which air flows at -20

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In A Fruit Exporting Company A Cold Blow Is Given To The Fruit By Placing Them On A Flat Tray On Which Air Flows At 20 1 (71.91 KiB) Viewed 43 times

In a fruit exporting company, a cold blow is given to The fruit by placing them on a flat tray on which air flows at -20°C And at a speed of 1 m/s. For a 10 m long tray, A) Calculate the time it takes for a cranberry to reach a temperature of 10°C, considering that the fruits are received at Tamb= 20°C. Consider a Diameter of 12 mm. B) Can the same calculation be made for a strawberry (30 mm in diameter)? And an apple (80 mm in diameter)? Prove your answer, and if you are Yes, calculate that time. C) Will there be differences in the cooling times of blueberries? In If so, calculate the maximum and minimum temperatures expected For the blueberries on the tray, considering the time of residence In point (a). Help: Consider fruit as spheres. When they are in the tray, they They only exchange heat with the air flow through the surface exposed to it. Airflow (i.e. by half of its surface). Due to the superficial roughness of the tray, turbulent conditions are reached quickly, so Recommends using the following correlations for the Nusselt number: NuL = 0,037 Re/Pr¹/3 Nu, -0,0296 Re/Pr¹/3 Thermophysic properties of the fruit Arándano Frutilla Manzana airuta. k (W/mK) p (kg/m³) c (kJ/kgK) 0,310 640 1,1 800 0,418 840 3,83 4,00 3,81