Engineering, 08.11.2019 05:31 door9817
Arow of rectangular baffle blocks (0.4m high, 0.6m wide and 1.0m long) are to be installed in a 12m wide stilling basin to aid energy dissipation after a dam spillway. the blocks are spaced uniformly 0.4m apart across the spillway exit. the drag force d in each block is given by d = 0.5cd\small \rhov 2afb, with afb as the frontal area of the block and cd as the effective drag coefficient = 0.25 and v as the upstream velocity. if the flow rate is 150m3 /s and the upstream depth is 2m, determine the downstream water depth and energy loss for the two cases;
(a) blocks not installed (energy dissipated as a hydraulic jump downstream)
(b) blocks installed (momentum theory, considering drag forces)
(c) summarize a comparison between both scenarios
Answers: 3
Engineering, 04.07.2019 18:10
Aflywheel accelerates for 5 seconds at 2 rad/s2 from a speed of 20 rpm. determine the total number of revolutions of the flywheel during the period of its acceleration. a.5.65 b.8.43 c. 723 d.6.86
Answers: 2
Engineering, 04.07.2019 18:20
Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.
Answers: 1
Engineering, 05.07.2019 19:10
Tech a says never use a water hose to clean up dust after a repair. tech b says never use a floor scrubber to clean up dust after repairs. who is correct?
Answers: 1
Engineering, 06.07.2019 02:30
Plot schematically the tensile stress versus strain curves for a typical thermoplastic material at a temperature below its glass transition temperature (tg and at a temperature above its tg, respectively. do the same for a typical thermosetting material. list in a table any differences or similarities between the two materials at t> tg and t < tg, respectively, and relate them to the structures of the two types of polymers
Answers: 3
Arow of rectangular baffle blocks (0.4m high, 0.6m wide and 1.0m long) are to be installed in a 12m...
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