The filter cake of Exercise 18.28 is extruded into cylindrical-shaped pieces measuring 114 in. in diameter 318 in. long that are placed in trays that are 6 cm high x 1 m long x 0.5 m wide and through which the air passes. The external porosity is 50%. If the superficial velocity of the air, which is at the same conditions as in Exercise 18.28, is 1.75 m/s, determine:

(a) The drying time for the constant-rate period.

(b) The drying time for the falling-rate period.