Small potato balls of 0.5 cm radius (can be approximated as a sphere) baked in the oven and initially at a uniform temperature of 170°C. Assume, potatoes have a density of 650 kg/m³, specific heat of 3400 J/kgK and conductivity of 1 W/mK. You want to eat potatoes quickly without burning your tongue so that you have decided to cool them down with forced convection. Air h, Te hot potato initially @ T; Air temperature is 20°C and the convective heat transfer coefficient is 80 W/m?K. Calculate the time (in seconds) required for its surface temperature to drop 130°C. Round the value you calculated and write it as an integer!!! For example, if you find 8.2, write is as 8. Answer:

Small potato balls of 0.5 cm radius (can be approximated as a sphere) baked in the oven and initially at a uniform temperature of 170°C. Assume, potatoes have a density of 650 kg/m³, specific heat of 3400 J/kgK and conductivity of 1 W/mK. You want to eat potatoes quickly without burning your tongue so that you have decided to cool them down with forced convection. Air h, Te hot potato initially @ T; Air temperature is 20°C and the convective heat transfer coefficient is 80 W/m?K. Calculate the time (in seconds) required for its surface temperature to drop 130°C. Round the value you calculated and write it as an integer!!! For example, if you find 8.2, write is as 8. Answer:

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.18P

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