Question

⦁ Two hundred cubic centimeters per hour of Methane
, flows through a pipe at 30 bar and 30 oC. Estimate the mass flow
rate of methane in kg/h. (Use z = 0.8)

Molecular weights are: C = 12 and H = 1

Answer #1

A flow of methane is 8,000 scfm (standard cubic feet per
minute). What is the mass flow rate in lbm/hour? What is the actual
volumetric flow if the actual conditions are 112°F and 0.8 atm?
Standard conditions are 1 atm and 59°F. Please report your answer
to 4 significant digits. Assume the ideal gas law applies. The
molecular weight of methane to 5 significant digits is 16.042
g/mol.

A natural gas contains 80.0 wt% CH4 and the balance C2H6. Five
hundred cubic meters per hour of this gas at 40.0°C and 1.30 bar is
to be burned with 25.0% excess air. The air flowmeter is calibrated
to read the volumetric flow rate at standard temperature and
pressure. What should the meter read (in SCMH — standard cubic
meters per hour) when the flow rate is set to the desired
value?

Water flows through a circular pipe with a radius of 10 cm at 12
m/s. (a) If the radius of the pipe increases to 20 cm, what is the
new speed of the water in the pipe? (b) Does the volume flow rate
or the mass flow rate change in the pipe? (c) Calculate both the
volume flow rate and mass flow rate in the pipe?

Assume that water flowing through a pipe with a circular cross
section flows most rapidly at the center of the pipe and least
rapidly near the pipe walls (this might be reasonable because of
friction between the water and the pipe walls). Assume that the
water speed at the walls is half as great as the speed at the
center, and assume that the decrease is linear (i.e. the graph of
water speed versus radius is a straight line). If...

Water at 10 oC flows at a mass flow rate of 15 kg/s through a
nozzle that converges from a 10 cm diameter to 2 cm diameter. If
the outlet pressure is 1 bar, calculate the inlet pressure (Answer:
12.4 bar).

Fluid with specific weight 9.6 kN/m3 flows through a
pipe with diameter 1.04 cm at an average velocity 19.1 km/hr.
Calculate the mass flow rate in kg/s.

A fuel gas containing 74.0% methane, 12.0% ethane, and 14.0%
propane by volume flows to a furnace at a rate of 1450 m3/h at
15.0°C and 180.0 kPa (gauge), where it is burned with 16.0% excess
air.
Calculate the required flow rate of air in SCMH (standard cubic
meters per hour).
You may take the composition of air to be 21.0 mol% O2 and the
balance N2.

Water flows upward and then is discharged to the right through a
3.00 inch diameter pipe elbow, at a steady flow rate of 1.00 cubic
foot per second, and the gage pressure at the entrance to the elbow
is 30.0 psi. What vertical and horizontal force is necessary to
hold the elbow stationary, neglecting any required torque.

A liquid of density 860 kg/m3 flows through a
horizontal pipe that has a cross-sectional area of 1.40 x
10-2 m2 in region A and a
cross-sectional area of 9.40 x 10-2 m2 in
region B. The pressure difference between the two regions
is 6.10 x 103 Pa. What are (a) the
volume flow rate and (b) the mass flow rate?
p.s. please box the final answers.

Steam at 350°F flows through a 3-in (ID) copper pipe having a
thickness of 0.22 in. The outside surface of the pipe is insulated
with 1-in-thick layer of fiberglass and 0.008-in-thick layer of
aluminum. The outside surface of the insulation is exposed to air
at 130°F. The convection coefficients for steam and air are 25 and
12 Btu/h-ft2 -°F, respectively. The thermal conductivity of
fiberglass is 0.022 Btu/h-ft-°F.
a. Calculate the rate of heat transfer for 30-ft length of the...

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