Q.6. A plate 450 mm x 150 mm has been placed longitudinally in a stream of crude oil (Sp. gravity 0.925 and kinematic viscosity of 0.9 stoke) which flows with velocity of 6 m/s. Calculate: (i) The friction drag on the plate (ii) Thickness of boundary layer at trailing edge. (iii) Shear stress at the trailing edge.

Q.6. A plate 450 mm x 150 mm has been placed longitudinally in a stream of crude oil (Sp. gravity 0.925 and kinematic viscosity of 0.9 stoke) which flows with velocity of 6 m/s. Calculate: (i) The friction drag on the plate (ii) Thickness of boundary layer at trailing edge. (iii) Shear stress at the trailing edge.

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

Q. 6 A 4.5-cm wide space between two plates is filled with SAE 30W lubricating oil at 26.7°C (Hoil = 0.301645 N.S/m2 ). What is the area of a very thin plate which is dragged by a force of 18 N through the oil at velocity of 16 m/min if the plate is 1.5 cm away from one of the fixed surfaces?
When immersed in a uniform stream V, a heavy rod hingedat A will hang at Pode’s angle θ, after an analysis by L.Pode in 1951 (Fig.). Assume that the cylinder hasnormal drag coefficient CDN and tangential coefficient CDTthat relate the drag forces to VN and VT, respectively. Derivean expression for Pode’s angle as a function of the flow androd parameters. Find θ for a steel rod, L = 40 cm, D = 1 cm,hanging in sea-level air at V =35 m/s.
An aluminum cylinder weighing 30 N, 6 cm in diameterand 40 cm long, is falling concentrically through a longvertical sleeve of diameter 6.04 cm. The clearance is fi lledwith SAE 50 oil at 20 ° C. Estimate the terminal (zeroacceleration) fall velocity. Neglect air drag and assume alinear velocity distribution in the oil. Hint: You are givendiameters, not radii.
7.27 A thin smooth disk of diametd, D is immersed parallel to a uniform stream of velocity U. Assuming laminar flow and using flat-plate theory as a guide, develop an approximate formula for the drag of the disk.
In the flow of air at 20°C and 1 atm past a flat plate inFig. , the wall shear is to be determined at position x bya floating element (a small area connected to a strain-gageforce measurement). At x = 2 m, the element indicates ashear stress of 2.1 Pa. Assuming turbulent flow from the leadingedge, estimate (a) the stream velocity U, (b) the boundarylayer thickness δ at the element, and (c) the boundary layervelocity u, in m/s, at 5 mm above the element.
Icebergs can be driven at substantial speeds by the wind.Let the iceberg be idealized as a large, flat cylinder, D >> L,with one-eighth of its bulk exposed, as in Fig.. Letthe seawater be at rest. If the upper and lower drag forcesdepend on relative velocities between the iceberg and thefluid, derive an approximate expression for the steady icebergspeed V when driven by wind velocity U.
The Cessna Citation executive jet weighs 67 kN and has awing area of 32 m2. It cruises at 10 km standard altitudewith a lift coeffi cient of 0.21 and a drag coeffi cient of0.015. Estimate (a) the cruise speed in mi/h and (b) thehorsepower required to maintain cruise velocity.
Q.1 The velocity distribution in a turbulent boundary layer is given by 1/7 %3D What is the displacement thickness 8*?
A heavy sphere attached to a string should hang at an angleθ when immersed in a stream of velocity U, as in Fig. Derive an expression for θ as a function of thesphere and flow properties. What is θ if the sphere is steel(SG = 7.86) of diameter 3 cm and the flow is sea-levelstandard air at U =40 m/s? Neglect the string drag.
A liquid flows tangentially past a flat plate. Given: u=10 Ns/m², p=1.5kg/m', L= 2m,approach velocity U = 20 m/s. The %3D boundary layer thickness is equal to a. 8 = 0.34 cm b. 8 = 3.4 cm С. 8 = 0.034 cm %3D d. 8 = 34 cm
Air at 20 °C flows at V = 10 m/s over a flat plate of length L= 1.52 m and width W = 2 m.Calculate the boundary layer thickness at the trailing edge of plate and drag force on one sideof plate if:a. Surface of plate is smooth.b. Surface of plate is rough.The air properties at 20 °C are: Density, ? = 1.2 kg/m3and dynamic viscosity, ? = 1.8x 10-5kg/m·s and kinematic viscosity, ν = 1.516×10-5m2/s
Air at 20 °C flows at V = 10 m/s over a flat plate of length L= 1.52 m and width W = 2 m.Calculate the boundary layer thickness at the trailing edge of plate and drag force on one sideof plate if:a. Surface of plate is smooth.b. Surface of plate is rough.The air properties at 20 °C are: Density, ? = 1.2 kg/m3and dynamic viscosity, ? = 1.8x 10-5kg/m·s and kinematic viscosity, ν = 1.516×10-5m2/s. I got the first solution which was wrong kindly solve it correctly