Question

During air cooling of oranges, grapefruit, and tangelos, the heat transfer coefficient for combined convection, radiation, and evaporation for air velocities of 0.11<V< 0.33 m/s is determined experimentally and is expressed as h = 5.05 KairRe131D, where the diameter Dis 0.1 m. Oranges are cooled by refrigerated air at 5°C and 1 atm at a velocity of 0.3 m/s. Given: The thermal conductivity of the orange is given to be k = 0.50 W/m°C. The thermal conductivity and the kinematic viscosity of air at the film temperature of (T. + T.)/2) = (15+5)/2 = 10°C are k= 0.02439 W/m°C, v =1.426 x 10-5 m2/s. 3. value: 3.00 points Required information You received credit for this question in a previous attempt Determine the initial rate of heat transfer from the orange that is initially at 15°C with a thermal conductivity of 0.50 W/m.K. (Round the final answer to two decimal places.) The initial rate of heat transfer from the orange is 4.958 W.

Answer 1

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