The boeing 787 dreamliner is designed to be 20% more fuel efficient than the comparable boeing 767 and flies at an average cruise speed of mach 0.85. the midsize boeing 767 has a range of 12,000 km, a fuel capacity of 90,000 l, and flies at mach 0.80. assume the speed of sound is 700 mph, and calculate the projected volumetric flow rate of fuel for each of the two dreamliner engines in m3/s. (25 pts)
(a) assume that the fuel lines for each engine in the boeing dreamliner are 7/8 inches in diameter and that the density and viscosity of jet fuel are 800 kg/m3 and 8.0 ∗ 10−3 kg/(m · s), respectively. calculate the average velocity of the fuel in m/s and the reynolds number of this flow. state if the flow is laminar or turbulent.

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w