A high density polyetheylene (HDPE) film that is 100 micron thick and 13 cm wide is extruded at a rate of 1.6 m/sec. The temperature of the foil as it comes
out of the die is 230 °C and the surrounding air is at a temperature of 25°C. The convection heat transfer coefficient is 70 W/(m² °C). For HDPE
kg
$\rho = 960 \frac{kg}{m^3}$, $\lambda = 0.48 \frac{W}{m \cdot oC}$, $C = 1855 \frac{J}{kg \cdot oC}$
a) Find the temperature of the HDPE film at a distance of 10 cm from the die (in °C with 3 significant digits).
Number
b) Find the temperature of the HDPE film 1 m from the die (in °C with 3 significant digits).
Number
c) Use MATLAB to write a program to plot the temperature of the HDPE film as a function of the distance from the die. Please publish MATLAB script in MS
Word format, add to the MS Word document for this assignment, and select yes below. This part will be manually graded.
Yes No
d) Using your program from Part c, plot the temperature of the HDPE film as a function of the distance from the die when the heat transfer coefficient is
increased to twice the value above. Then plot the temperature when both the heat transfer coefficient and velcoity are increased to twice the value above.
Don't forget to copy and paste these two plots into the MS Word document for this assignment and select yes below. This part will be manually graded.
