Dust particles of diameter 0.06 mm and density 1.6 g/cm are unsettled during high winds and rise to a height of 350 m by the time things calm down. Estimate how long will it take for the dust particles to fall back to the ground in still air at 1 atm and 15°C, and their velocity. Disregard the initial transient period during which the dust particles accelerate their terminal velocity, and assume Stokes law to be applicable. Pe =1.225kg /m', µ =1.802 x 10 kg/m.s

Dust particles of diameter 0.06 mm and density 1.6 g/cm are unsettled during high winds and rise to a height of 350 m by the time things calm down. Estimate how long will it take for the dust particles to fall back to the ground in still air at 1 atm and 15°C, and their velocity. Disregard the initial transient period during which the dust particles accelerate their terminal velocity, and assume Stokes law to be applicable. Pe =1.225kg /m', µ =1.802 x 10 kg/m.s

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Engine oil at 40°C flows over a 20-m-long & 3-m-wide smooth flat plate with a free-stream velocity of 50 m/s. Determine the drag force acting on upper side of the plate when:a) Flow is parallel to plate length.b) Flow is parallel to plate width.
None
A 1.5-m-long and 0.5 m wide flat plate is immersed in water flow with velocity of kg 5 m/s. (F = 1000 =1.02 x10- m Determine; (a) The boundary layer thickness at leading edge of the plate, (b) The drag coefficient and the drag force, (c) the drag coefficient and force, if the flow is laminar at the entrance (Rex, ait= 106), (d) the drag force, if the roughness height & is 0.2 mm on the plate.
A person is driving his motorcycle at a speed of 90 km/h in air at 20°C. The frontal area of the motorcycle and driver is 0.75 m2. If the drag coefficient under these conditions is estimated to be 0.90, the drag force acting on the car in the flow direction is (a) 379 N (b) 204 N (c) 254 N (d ) 328 N (e) 420 N
(B) Air at 27 C flows over a flat plate with a velocity of 3 m/s. Calculate the boundary layer thickness (8) at a distance 25 cm from the leading edge of the plate. The physical properties of air are: p=1.17 kg/m² and 1.85x10 m/s. 8 4.64 X Re 1/2
From Table the drag coefficient of a wide plate normalto a stream is approximately 2.0. Let the stream conditionsbe U∞ and p∞. If the average pressure on the front of theplate is approximately equal to the free-stream stagnationpressure, what is the average pressure on the rear?
Calculate the heat transfer from a 60 cm x 60 cm plate on which air flows at 40⁰C and. The plate temperature is 100⁰ C while the air speed is 5 m/s.Find the thickness of the boundary layer at a distance of x = 20 cm, for the same data in problem "number 1 In the picture below"