Air flowing through a duct is heated through contact with a heat exchanger through which steam is flowing. Dry air enters one inlet of the heat exchanger at 70 F and 13.7 psia with a volume flow rate of 2000ft^3 /min. Saturated steam at 15 psig enters the other heat exchanger inlet and exits with 15% quality.
a. Determine the heat transfer rate (Btu/hr) and mass flow rate of steam (lbm/hr) necessary to provide an air outlet temperature of 140 F.

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.