A disk-shaped turbine rotor is heat-treated by quenching in water at \(p=1 \mathrm{~atm}\). Initially, the rotor is at a uniform temperature of \(T_{i}=1100^{\circ} \mathrm{C}\) and the water is at its boiling point as the rotor is lowered into the quenching bath by a harness.

(a) Assuming lumped-capacitance behavior and constant properties for the rotor, carefully plot the rotor temperature versus time, pointing out important features of your \(T(t)\) curve. The rotor is in Orientation A.

(b) If the rotor is reoriented so that its large surfaces are horizontal (Orientation B), would the rotor temperature decrease more rapidly or less rapidly relative to Orientation A?

Transcribed Image Text:

Orientation A Orientation B Turbine disk T;= 1100C Water bath 100C Tsat sat =