Consider a production method to produce a polymer cylinder that will subsequently be used for making medical devices. The polymer is extruded as a cylinder blank 10 cm in diameter and 45 cm long. When initially manufactured, the polymer contains 45 w% extrusion solvent, that must be "dried" so the maximum amount of solvent is 25 w% before the next step of the process. The polymer rod is placed in a convective air drier that maintains the polymer surface a 15 w% solvent. The diffusivity of solvent in the polymer is 1.04 x 10-5 cm2/s and the convective mass transfer coefficient is 2.31 x 10-6 cm/s. a. By simple calculation, demonstrate whether convective resistance is minimal or not. b. Based on your answer to a, how long (in hours) will it take to achieve the conditions. c. Compare to you answer from b the time to achieve the conditions if you had not done the calculation in a and assumed incorrectly about convective resistance.