Mention the name of a technique which can be used to control the boundary layer
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A: we know that in boundary layer, turbulent zone comes after transition zone.
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Q: The viscous laminar flow of air over a flat plate results in the formation of a boundary layer. The…
A: Given data The boundary layer thickness at the end of the plate of length L is δL.
Mention the name of a technique which can be used to control the boundary layer
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- Explain boundary layer thickness?Q1) Briefly explain laminar, transition and turbulent flow based on boundary layer separation.Discuss the following exchange processes between the earth and the atmosphere and the importance of boundary layer turbulence on them:(a) sensible heat;(b) water vapor;(c) momentum
- The Blasius boundary layer profile is an exact solution of the boundary layer equations for flow over a flat plate. However, the results are somewhat cumbersome to use, since the data appear in tabular form (the solution is numerical). Thus, a simple sine wave approximation. is often used in place of the Blasius solution, namely, u(y) ≅ U sin (?/2 y/?) for y < ?, and u = U for y ≪ ?, where ? is the boundary layer thickness. Plot the Blasius profile and the sine wave approximation on the same plot, in nondimensional form (u/U versus y/?), and compare. Is the sine wave profile a reasonable approximation?Which one of the following is not a flow region where the boundary layer approximation may be appropriate? (a) Jet (b) Inviscid region (c) Wake (d ) Mixing layer (e) Thin region near a solid wallTwo definitions of displacement thickness are given in this chapter. Write both definitions in your own words. For the laminar boundary layer growing on a flat plate, which is larger—boundary layer thickness ? or displacement thickness ?*? Discuss.
- On a hot day (T = 30°C), a truck moves along the highway at 29.1 m/s. The flat side of the truck is treated as a simple, smooth flat–plate boundary layer, to first approximation. Estimate the x-location along the plate where the boundary layer begins to transition to turbulence. How far downstream from the beginning of the plate do you expect the boundary layer to become fully turbulent? Give both answers to one significant digit.In your own words, list at least three “red flags” to look out for when performing laminar boundary layer calculations.An aluminum canoe moves horizontally along the surface of a lake at 3.5 mi/h. The temperature of the lake water is 50°F. The bottom of the canoe is 20 ft long and is flat. Is the boundary layer on the canoe bottom laminar or turbulent?
- A gas at 20°C and 1 atm flow at 6 ft/s past a thin flat plate.At x = 3 ft, the boundary layer thickness is 0.052 ft.Assuming laminar flow, which of the gases in Table A.4 isthis likely to be?7. A flat plate has a length of 40 cm and width of 1 m. Air, at pressure of 2 atm,temperature of 57 C, and velocity of 3 m/s flows over the plate. Find the thicknessof the boundary layer at x = L.For flow along a flat plate with x being the distance from the leading edge, the boundary layer thickness grows like (a) x (b) √x (c) x2 (d ) 1/x (e) 1/x2