Engineering, 22.08.2020 17:01 shawnr6989
A fine wire of diameter D is positioned across a passage to determine flow velocity from heat transfer characteristics. The current is passed through the wire to heat it, and the heat is dissipated to the flowing fluid by convection. The resistance of the wire is determined from electrical measurements and the temperature is known from the resistance. For a fluid of arbitrary Prandtl number, develop an expression fro its velocity in terms of the difference between the temperature of the wire and free stream temperature of the fluid. What is the velocity of an airstream, in m/s at 1 atm and 25βC, if a wire of 0.5 mm diameter achieves a temperature of 40βC while dissipating 39 W/m?
Answers: 3
Another question on Engineering
Engineering, 04.07.2019 18:10
Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false
Answers: 3
Engineering, 04.07.2019 18:10
Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10
Answers: 1
Engineering, 04.07.2019 18:20
Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?
Answers: 3
Engineering, 04.07.2019 18:20
Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis
Answers: 1
You know the right answer?
A fine wire of diameter D is positioned across a passage to determine flow velocity from heat transf...
Questions
Mathematics, 05.07.2019 23:00
Chemistry, 05.07.2019 23:00
Spanish, 05.07.2019 23:00
Mathematics, 05.07.2019 23:00
Mathematics, 05.07.2019 23:00
History, 05.07.2019 23:00
Mathematics, 05.07.2019 23:00
