Question

3) Based on the example done in class for the annulus between rotation cylinders, consider the following. The angular velocity of the outer cylinder is 7908 rpm. The outer cylinder has a radius of 5.06 cm, and the clearance between the cylinders is 0.027 cm. The annulus is filled with oil. What is the maximum temperature in the oil if both wall temperatures are 158"C? The oil properties are: viscosity 92.3 cp, specific gravity 1.22, conductivity 0.0055 cal/(sec-cm-*C)

Answer 1

The maximum temperature occurs in the oil at the center of the both wall.
Sclution - 7908 5,06 Cm o.oos5cal/secーCrn _ .C.= 2.301 22, K: WImK. 2 12 8

60 60 욘ad/s .. C: 829.124 2.301