For eutectoid steel:

b) Sketch the thermal history (i.e., path) and calculate the final microstructure when the steel has the following heat treatment sequence : i) instantaneously quenched from 850 C to 300 C, ii) held at 300 C for 1 hour, and iii) air cool to 20 C. (Materials science)

A packed bed reactor is filled with catalyst material with a diameter of 1.5 mm. The length of the reactor is 80 cm and the catalyst has a porosity of 0.45. The superficial mass velocity of the inlet gas is 7.5 kg/m2-s with a viscosity of 1.55x10-5 kg/m-s and a density of 2.8 kg/m3. The inlet pressure is 300 kPa. Find the pressure, P, at the end (the exit) of the PBR.

A tank containing air at atmospheric pressure must be purged with pure nitrogen until the oxygen concentration is 5 ppm. The tank can withstand a vacuum, so vacuum purging is considered. The vacuum line used produces an absolute pressure of 6 mmHg. How many vacuum cycles are necessary?

A high grade fuel oil which consists of only hydrocarbon, CxHy is burnt in a combustion chamber at 25 °C. The standard heat of combustion is -43,515 J/g with CO2 (g) and H2O (l) as products. The temperature of the fuel and air entering the combustion chamber is 25 °C. The air is assumed dry. The flue gases leave at 300 °C and their average composition is 11.2 % CO2, 0.4 % CO, 6.2 % O2 and 82.2 % N2 based on dry basis.
Solve the following problems using a basis of 100 mol dry flue gases.

(a) Determine the molecular composition and mass of the fuel oil, CxHy.

(b) Determine the heat of combustion that is absorbed/released from the combustion chamber.

Steam at 4 MPa and 350°C is expanded in an adiabatic turbine to 120 kPa. What is the isentropic efficiency of this turbine if the steam is exhausted as a saturated vapor?

A CMFR is operating at steady state with a second order decay reaction of rate constant k2=0.5 L/mg/d. It is exactly meeting its goal of 99.9% removal efficiency and the allowed maximum effluent concentration of 0.05 mg/L. The volumetric flow rate is 450 m3Id.

a. What is the influent concentration in mg/L?

b. What is the reactor volume in m3? What volume would be required if the removal efficiency goal were 99.0%? c(5). If the CMFR is replaced with a PFR, what reactor volume is needed (in m3)?

In microfiltration what is Dependence of the TMP on the permeate flow, liquid viscosity, membrane resistance, and cake resistance.

With the aid of a diagram explain how a thermal desorption-gas chromatography-mass spectrometer functions for the analysis of VOCs.

True or False

The change in enthalpy of a hypotehtical reversible process and the change in enthalpy of it's representative actual processes are equal?

Entropy production is greater for an irreversible process than a reversible process?

Discuss why cathode flow channel design is less important for SOFCs than for PEMFCs. Hint: Consider the typical operating temperature of a SOFC and its effect on jL.

A double pipe heat exchanger is to be designed to cool 5 gal/min of hot oil from 250°F to 120°F using 10 gal/min of cooling water available at 70°F. The heat exchanger is to consist of sections of 0.75 inch 16 BWG copper tubing inside 1.5 inch 16 BWG tubing; the water flows in the annular space. The shell-side heat transfer coefficient for this system is known to be 737 Btu/hr×ft²×°F.

a) Estimate the required length of the countercurrent exchanger, neglecting the resistance of the tube wall in your calculations.

b) Estimate the required lengthof the exchanger if operated co-currently

The following data are available:

Wall thickness for 16 BWG = 0.065 in.

What are the major pollutants emitted from the tailpipe of an automobile? Why is each pollutant important? Name one control method or device used on present-day automobiles to control each pollutant?

a. What are the two main hazards associated with chemical plants and list three examples of each?

What are Material Safety Data Sheets (MSDSs) and the role of MSDS in Process Design?