(a) Use the data in Example 8-6 and calculate the values of P for the given temperature range for values of r/c of 600,800,1200, and 1400. Calculations for r/c of 1000 have already been made in Example 8-6. Plot the curves for P versus film temperature.
(b) From the curves, read and tabulate the temperature values for loads P of 80, 200, and 220 psi of projected area for each of the values above r/c. Plot the curve for film temperature versus r/c for P = 180 psi. Do the same for P = 200 psi and for P = 220 psi. Note that there is an optimum value for r/c at which the film temperature is a minimum.
(c) Plot the ε values versus P for the above r/c ratios. From the curves, read and tabulate the ε values for loads P of 180,200, and 220 psi for each r/c curve. Calculate the corresponding ho values and plot versus r/c for P = 180 psi. Do the same for P = 200 psi and for P = 220 psi. Note that there is an optimum r/c at which ho is a maximum for any given pressure P.
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