Consider the rotating disk of Problem 6.16. A disk-shaped, stationary plate is placed a short distance away from the rotating disk, forming a gap of width g. The stationary plate and ambient air are at
where
Want to see the full answer?
Check out a sample textbook solutionChapter 6 Solutions
Fundamentals of Heat and Mass Transfer
Additional Engineering Textbook Solutions
Mechanics of Materials (10th Edition)
Mechanics of Materials
Statics and Mechanics of Materials (5th Edition)
Fox and McDonald's Introduction to Fluid Mechanics
Engineering Mechanics: Statics
Engineering Mechanics: Dynamics (14th Edition)
- The viscous laminar flow of air over a flat plate results in the formation of a boundary layer. The boundary layer thickness at the end of the plate of length L is Delta L . When the plate length is increased to twice its original length. The percentage change in laminar boundary layer thickness at the end of the plate (with respect to Delta L ) is ______arrow_forwardOutside an inner, intense-activity circle of radius R , a tropicalstorm can be simulated by a polar-coordinate velocitypotential ϕ ( r , θ ) = U o R θ , where U o is the wind velocity atradius R . ( a ) Determine the velocity components outsider = R . ( b ) If, at R = 25 mi, the velocity is 100 mi/h and thepressure 99 kPa, calculate the velocity and pressure atr =100 mi.arrow_forwardEngine oil at T = 60°C is forced to flow between two very large, stationary, parallel flat plates separated by a thin gap height h = 3.60 mm. The plate dimensions are L = 1.25 m and W = 0.550 m. The outlet pressure is atmospheric, and the inlet pressure is 1 atm gage pressure. Estimate the volume flow rate of oil. Also calculate the Reynolds number of the oil flow, based on gap height h and average velocity V. Is the flow laminar or turbulent?arrow_forward
- Water at 60° C flows over 2.5 cm square flat plate 90°C at a velocity of 4 m/s. 1- Calculate the drag force , Xcritical 2- If the flat plate is exposed to the natural air convection at 60 °C instead of water with same values of temperatures and length calculate Rayleigh number.arrow_forwardFor flow over a smooth plate, what approximately is the maximum length of the boundary layer if V_o = 9.0 m/s in the irrational uniform flow and the fluid is air? Water?arrow_forwardA 0.5m x 2m flat thin plate is moved at 5m/s on a 2-mm thick layer of SAE 30 oil at 38 degrees Celsius that separates it from a flat surface. The velocity distribution between the plate and the surface is assumed to be linear. What force is required if the plate and surface are horizontal? (μSAE30 = 0.1 N-s/m2)arrow_forward
- A 20 °C water flows to 50cmx60cm flat plate with velocity of 3m/s . The flat plate surface temperature is maintained at 40 °C. The air flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, at what length the flow become turbulent?arrow_forwardCalculate 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"arrow_forwardAir flows over a stationary flat plate at speed of 4,5 m/s . Plate has a width of 1 m. Air has a density of 1.2 kg/m3 and kinematic viscosity of 1.5x 10-5 m 2/s . Consider plate is totally in air flow field and upper and lower surfaces are identical a) Calculate maximum length of the plate to have a fully laminar flow (in m)b) Calculate total frictional force on the plate considering two surfaces (in N)c) In order to eliminate the frictional force on its surfaces calculate the plate speed(in m/s)arrow_forward
- Light oil at 75°F flows over a 17-ft-long flat plate with a free-stream velocity of 5 ft/s. Determine the total drag force per unit width of the plate.arrow_forwardThe velocity profile in laminar boundary layer is approximated by the polynomial function in terms of y:arrow_forwardA thin flat plate 20 cm by 90 cm is immersed in a 1m/s stream of water at 20 °c ( density=998, viscosity=0.001)the stream is parallel to the long side, compute the total friction drag considering both front and back sides of the platearrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning