Methane is burned with air and the exhaust products are measured (on a dry, volumetric basis) to be 4.8% CO2, 0.12% CO, 12.25% O2, and balance N2. Determine (a) the air-tofuel ratio (mass based) (5 points), (b) equivalence ratio (5 points) (c) the percent theoretical air (%) (5 points), (d) the percent excess air (%) (5 points), and (e) exhaust dew point (°C) if the exhaust is at 1 atm (5 points). (25 points)

Methane is burned with air and the exhaust products are measured (on a dry, volumetric basis) to be 4.8% CO2, 0.12% CO, 12.25% O2, and balance N2. Determine (a) the air-tofuel ratio (mass based) (5 points), (b) equivalence ratio (5 points) (c) the percent theoretical air (%) (5 points), (d) the percent excess air (%) (5 points), and (e) exhaust dew point (°C) if the exhaust is at 1 atm (5 points). (25 points)

What are main differences between the Finite Difference Method and Finite Elements Method?

How are the boundary and interior values of the finite element solution obtained?

What are the principal polymers used in fiber-reinforced polymers?

what are the main trends in power and wing loading for climb, stall, landing distance, and cruise speed?

Consider a surface that has N sites each of which can adsorb one gas molecule. suppose that it is in contact with a gas with the chemical potential u. Assume that an adsorbed molecule has energy -e0 compared to one in the gas phase. Show that the surface coverage T (the ratio of adsorbed molecules to adsorbing sites) is given as

T=1/(exp(-(u+e0)/kT)+1). (Hint: You can ignore the volume change upon adsorption, which means that the Gibbs free energy is equal to the Helmholtz free enrgy in this system.)

Fluid Mechanics Pipe Problem

Type 2 EXAMPLE. Water at 20°C (r=1000 kg/m3 , µ= 0.001 Ns/m2 ) is flowing through 100 m 3/8" steel Sch 80 pipe. Inlet pressure is 11 kPa and outlet pressure is 10 kPa. Z1 = 10 m and Z2 = 2 m.

Find Q.

R22 is compressed adiabatically and reversibly from saturated vapor at -20 deg F to 200 psia. Find the final temperature and the specific work done.

A counterflow, concentric tube heat exchanger used for engine cooling has been in service for an extended period of time. The heat transfer surface area of the exchanger is 5 m², and the design value of the overall convection coefficient (without any fouling) is 38 W/m²K. During a test run, engine oil flowing at 0.1 kg/s is cooled from 110^oC to 66^oC by water supplied at a temperature of 25^oC and a flow rate of 0.18 kg/s. Determine whether fouling has occurred during the service period. If so, calculate the fouling factor, R^”_f (m²K/W). Specific heat of engine oil is 2166 J/kgK, and water is 4178 J/kgK.

What is R^”_f = x 10^-3 m²K/W?

A water turbine is placed at the bottom of a hill. It receives Q = 30 m³/s of water from a large lake at the top of the hill. The elevation difference between the turbine and the free surface of the lake is h = 100 m. Water leaves turbine with the speed V₂ = 2 m/s. Head loss in the water supply pipe connecting turbine and the lake is 20 m. Calculate power (in MW) transferred from the water to the turbine.

a.Consider a component (you decide) in an aircraft that is subjected to creep. What standard creep reduction techniques would be best suited?

b.How does temperature affect creep rates and why?

c.Is there a difference between metals and plastics with creep failure?

d.Use the Hunt Library or a preferred one to explain constant stress or constant strain testing for plastics. What time scales are reasonable to test and determine with confidence?

Q.8. Super-heated steam at 875 K is flowing through a thick walled tube of stainless tube with inside diameter 40mm and outside diameter50mm such that its inner wall is heated to a uniform temperature of 875K.To reduce heat loss, the tube is lagged with 30mm layer of asbestos insulation k=0.2 W/m.K. Calculate the heat loss using the electrical analogy per metre length if the outer surface temperature of the insulated tube is 350K.Thermal conductivity of steel=19 W/m.k.

0.2 kg/s of moist air at 45oC (DBT) and Humidity ratio 0.006 kgw/kgda (dry air) is mixed with 0.3 kg/s of moist air at 250C (DBT) and a humidity ratio of 0.018 kgw/kg da in an adiabatic mixing chamber. After mixing, the mixed air is heated to a final temperature of 40o C using a heater. Assume the barometric pressure to be 1 atm. Find

Enthalpies of both fluids

Temperature and humidity ratio of air after mixing.

Heat transfer rate in the heater.