Question 3:

An experiment is to be conducted to determine the heat transfer coefficient on the surface of a tomato that is placed in cold water at 7°C. The tomato (k = 0.59 W/m·K, α = 0.141 × 10−6 m2 /s, ρ = 999 kg/m3 , cp = 3.99 kJ/kg·K) with an initial uniform temperature of 30°C can be assumed spherical with a diameter of 8 cm. After 2 h, the temperatures at the center and the surface of the tomato are measured to be 10.0°C and 7.1°C, respectively. Can the Heisler’s Charts be used to address this problem! Using the Heisler’s Charts below, determine the heat transfer coefficient and the net amount of heat transfer (Q) during this period for such a tomato in water. Show the points in the Heisler’s Charts below that you used to solve this problem.