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Drag on cylinders and spheres decreases when the Reynolds number is in the region of 2...
Drag on cylinders and spheres decreases when the Reynolds number is in the region of 2 x 10 since (a) Flow separation occurs due to transition to turbulence (b) Flow separation is delayed due to onset of turbulence (©) Flow separation is advanced due to transition to turbulence (d) Flow reattachment occurs
5) (1 point) Drag on cylinders and spheres decreases when the Reynolds number is in the region of 2 x 105 since (a) Flow separation occurs due to transition to turbulence (b) Flow separation is delayed due to onset of turbulence (C) Flow separation is advanced due to transition to turbulence (d) Flow reattachment occurs
5) (1 point) Drag on cylinders and spheres decreases when the Reynolds number is in the region of 2 x 105 since (a) Flow separation occurs due to transition to turbulence (b) Flow separation is delayed due to onset of turbulence (c) Flow separation is advanced due to transition to turbulence (d) Flow reattachment occurs
1. A very smooth flat plate of length L-1 m and width b 3 m is immersed parallel to a stream of velocity 2 m/s. For both air and water as the working fluids [5 marks] Show that the flow is completely laminar over the entire plate. a. b. Determine the drag force on one side of the plate. Determine the thicknesses δ, δ*, and θ at the end of the plate (x L). [6 marks] C. For air use,...
1. A very smooth flat plate of length L = 0.5 m and width b = 2 m is immersed parallel to a stream of velocity 2 m/s. For both air and water as the working fluids; a. Show that the flow is completely laminar over the entire plate. (5 marks] b. Determine the drag force on one side of the plate. [4 marks] c. Determine the thicknesses , 8*, and at the end of the plate (x = L)....
8. Which of the following flow regimes are dependent on the Reynolds number in order to determine the friction factor? a) laminar flow b) critical flow c) turbulent flow (smooth pipe) d) turbulent flow (transition zone) e) turbulent flow (supercritical turbulence, rough pipes 9. Which of the following methods can be used to determine friction loss in pipelines? a) Darcy-Weisbach b) Manning c) Hazen-Williams d) a, b, and c e) a and b only 10. Solution of the classical 3-reservoir...
QUESTION 1 (T1) What is an adverse pressure gradient? (9.2) A. Where pressure increases with distance downstream O B. Where pressure decreases with distance downstream C. Where pressure is uniform in the flow D. Where pressure is pushing the iow downstream QUESTION 2 (T2) Where does an adverse pressure gradient occur on an airfoil? (9.2) O A. Leading edge O B. Near or after the point of maximum thickness O C.Only in a region where the boundary layer is turbulent...
Experiments show that the coefficient of drag C=F/(1/2ApV^2) for smooth spheres should only be a function of a Reynold's number. 8. Experiments show that the coefticient of drag Cp F(Ap) for smooth spheres should only be a function of a Reynold's number, Re PVD/μ). I lere F is the total drag force of the fluid on the sphere, and includes all the viscous and pressure forces, and A is the frontal area A D"4. The drag force ơn small spheres...
Calculate the Reynolds number, Re- (2rpv)/ n, for the following situations and decide whether the flow of fluid around them is laminar or turbulent. Then calculate the frag force using the appropriate formula. For the radius, use r 2(Area/perimeter) which, for a circle, gives the radius. Densities and viscosities are in the table on page 2. Also, to keep things uniform, we will use the boundaries for laminar and turbulent flow from Engineer's Toolbox, also on pg. 2 [1] A...
Part A [30 marks] Conceptual Questions (multiple choice and short answer questions) A1-A5 refers to the velocity vector plots shown bolow for the flow over a cylinder: Flow A Flow B A1. Flow A has a Reynolds number flow of a) Re 1 b) Re 100 c) Re 1000 d) Re 10 drag coefficient than in Flow B A2. Flow A has a) higher b) lower c) the same A3. Flow A has heat transfer than Flow B a) higher...