Diclofenac Patches are considered one of the
major transdermal patches
used as a pain killer. If the
patch was of circular shape
with radius of 2cm and the
thickness of the patch was
100 micro meter. The
release of diclofenac from
this dosage form showed a
lag time of 8.5 min.
calculate the total amount
of Diclofenac (mg) released
from the patch after 6hours,
if the concentration inside
the patch was 12.5mg/ml,
knowing that the partition
coefficient of the drug at
25°C is 10.5.
Select one:
a 326 mg
b. 112 58 mg
C. 107.56​

Asteel tube (k=50 w/mk) of inner and outer diameter di = 20mm and do=26mm, respectively, is used to transfer heat from hot gases flowing over the tube (h-hot = 200w/m2k) to cold water flowing through the tube (h-cold = 8000 w/m2k). what is the cold-side overall heat transfer coefficient uc? to enhance heat transfer 16 straight fins of rectangular profile are installed longitudinally along the outer surface of the tube. the fins are equally spaced around the circumference of the tube, each having a thickness of 2mm and a length of 15mm. what is the corresponding overall heat transfer coefficient uc? *solve for uc in both cases*