Calculate the cooking time (in mins) required to raise the temperature at 3/4 along the 8-cm length of thin flat "kutsinta" by 107K. The initial temperature of 20° is uniform. The "kutsinta" is heated with flowing steam at 750K and 0.1MPa and velocity of 155 cm/. The "Kutsinta's" heat capacity, density, and thermal conductivity are estimated to be 3,500 /.K;1,000/m³; and ), respectively. Calculate again the cooking time (in mins) by using the same information, except this time the velocity is 155 m/. Assume that the Nusselt correlation (Perry's Handbook) for the shape closest to "kutsinta" at isothermal surface conditions in this problem is valid (Note).
(Note: Consider the average temperature of the initial and final temperature of the surface as the constant surface temperature Ts for the Nusselt calculation.)
