In flow over a surface, velocity and temperature profiles are of the forms
where the coefficients A through G are constants. Obtain expressions for the friction coefficient
Want to see the full answer?
Check out a sample textbook solutionChapter 6 Solutions
Fundamentals of Heat and Mass Transfer
Additional Engineering Textbook Solutions
Engineering Mechanics: Statics
INTERNATIONAL EDITION---Engineering Mechanics: Statics, 14th edition (SI unit)
Degarmo's Materials And Processes In Manufacturing
Statics and Mechanics of Materials (5th Edition)
Manufacturing Engineering & Technology
Engineering Mechanics: Dynamics (14th Edition)
- Air enters a 12-cm-diameter adiabatic duct with inlet conditions of V1 = 150 m/s, T1 = 500 K, and P1 = 200 kPa. For an average friction factor of 0.014, determine the duct length from the inlet where the inlet velocity doubles. Also determine the pressure drop along that section of the duct.arrow_forwardA 4-m x 4-m flat plate maintained at a constant temperature of 80°C is subjected to parallel flow of air at 1 atm, 20°C, and 10 m/s. The total drag force acting on the upper surface of the plate is measured to be 2.4 N. Using momentum heat transfer analogy, determine the average convection heat transfer coefficient, and the rate of heat transfer between the upper surface of the plate and the airarrow_forwardA U-tube open at both ends is partially filled with water. Oil having a density of 750 kg/m3 is then poured into the right arm and forms a column L = 10.00 cm high. The density of air is 1.29 kg/m3.The right arm is then shielded from any air motion while air is blown across the top of the left arm until the surfaces of the two liquids are at the same height. (d) Determine the pressure difference between the water and oil columns(e) Determine the speed of the air being blown across the left arm.arrow_forward
- What is turbulent viscosity? What causes it?arrow_forwardThe weight of a thin flat plate 50 cm × 50 cm in size is balanced by a counterweight that has a mass of 2 kg, as shown. Now a fan is turned on, and air at 1 atm and 25°C flows downward over both surfaces of the plate (front and back in the sketch) with a free-stream velocity of 10 m/s. Determine the mass of the counterweight that needs to be added in order to balance the plate in this case.arrow_forwardWater is flowing at a rate of 0.5 m³/s through a rough pipe with a diameter of 0.5 m and a length of 800 m. Assuming the average roughness height (k) is 0.15 mm, determine: a) the friction coefficient, b) the wall shear stress, c) the velocity at the centerline and 200 mm away from the pipe wall.arrow_forward
- What is the critical value of the pressure coefficient for an airplane flying at 170m/s in air at 2 deg C?arrow_forwardConsider a convergent duct with an inlet area of 3 ft2 and an exit area of 2.57 ft2. Air enters this duct with a velocity of 700 ft/s and a density of 0.002 slug/ft3, and air leaves with an exit velocity of 1,070 ft/s. Calculate the density (in kg/m3) of the air at exit.arrow_forwardStarting with the differential form of the energy equation, show that the flow velocity increases with heat addition in subsonic Rayleigh flow, but decreases in supersonic Rayleigh flow.arrow_forward
- The velocity and temperature of the flow ahead of a normal shock wave are 1215 m/s and 300 K, respectively. Calculate the velocity of the flow behind the shock.arrow_forwardAir flows through a 6-in-diameter, 50-ft-long adiabatic duct with inlet conditions of V1 = 500 ft/s, T01 = 650 R, and P1 = 50 psia. For an average friction factor of 0.02, determine the velocity, temperature, and pressure at the exitarrow_forwardThe wall of a furnace has an inner temperature of 500 F. The wall has a thickness of 2 inches and has a thermal conductivity of 0.02 Btu/(h·ft·F). On the outside, air at 30 F flows over the 10 ft x 10 ft wall at a speed of 10 ft/s. Determine the rate of heat loss from the furnace to the environment. Ensure the V speed is accounted forarrow_forward
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY