Consider the timed drug release pill shown in the figure below. The pill is ingested into the
Question:
a. Determine the total transfer rate of the drug from the whole pill (WA) to the body at when each 0.2 cm pore is filled to a depth of 0.12 cm with solid drug. You may assume that (1) the diffusion process is at a pseudo-steady-state, (2) the stomach fluid serves as an infinite sink for the drug so that cA, 0, and (3) the drug does not chemically degrade inside the pore. List all other assumptions you make as appropriate in the development of your mass-transfer model.
b. How long will it take (in hours) for all of the drug material in the reservoir to be released?
A = drug, B = water inside pore
T = 310 K
Lt = 0.2 cm, Lo = 0.12 cm, dpore = 0.04 cm, hpore = 0.20 cm
c. Propose adjustment of one of the variables in the process that will increase the required time in part (b) by a factor of 2.0.
Step by Step Answer:
Fundamentals Of Momentum Heat And Mass Transfer
ISBN: 9781118947463
6th Edition
Authors: James Welty, Gregory L. Rorrer, David G. Foster