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Consider the in-line tube bank of Problem 7.90 (D = 10 mm, L = 1 m, and ST = SL = 15 mm), with condensing steam used to heat atmospheric air entering the tube bank at Ti = 25°C and V = 5 m/s. In this case, however, the desired outlet temperature, not the number of tube rows, is known. What is the minimum value of NL needed to achieve an outlet temperature of To > 75°C? What is the corresponding pressure drop across the tube bank?
Distillation column control can be difficult because of all the following, except
The frequency of resonance vibrations in graphene changed upon the addition of a mass by: Shifting to higher frequency Can shift to higher or lower frequency depending on initial conditions
a 65 wt ni-35cu alloy is heated to temperature within the apha liqquid-phase region. if the compostiong of the alpha
A system consists of liquid nitrogen in equilibrium with nitrogen vapor. How many phases are present? The system undergoes a process during which all of the liquid is vaporized. Can the system be viewed as a pure substance during the process? Explain..
a paper plant replaces an aged and worn 150 ho engine with an efficiency of 90 with an updated model with an efficiency
Air undergoes an isentropic process from P_1 = 100 kPA and T_1 = 300 K to a final state where the temperature is 700 K. Assuming an ideal gas, find P_2 using both the ideal gas tables and assuming a constant specific heat ratio at the average tempera..
A multiple disc clutch employs 3 steel and 2 bronze discs having outer diameter 300 mm and inner diameter 200 mm. For a coefficient of friction of 0.22 find the axial pressure and the power transmitted at 750 r.pm if the normal until pressure is 0.13..
an ideal gas carnot cycle with air in a piston cylinder has a high temperature of 1200 k and a heat rejection at 400 k.
if the density of air is 1.2 kgm3 at the inlet and 1.05 kgm3 at the exit determine the percent increase in the velocity
calculate the force supported by the pin at A.
What is the average coefficient of friction between the two surfaces if the original amplitude was 150 mm? How much time has elapsed during the four cycles?
In the branched pipe system shown in Fig. 12.8, 850 L/min of water at 10°C is flowing in a DN 100 Schedule 40 pipe at A. The flow splits into two DN 50 Schedule 40 pipes as shown and then rejoins at B.
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