Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Chapter 5, Problem 5.30P
Air at 1000°C flows at an inlet velocity of 2
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Chapter 5 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Ch. 5 - Evaluate the Reynolds number for flow over a tube...Ch. 5 - 5.2 Evaluate the Prandtl number from the following...Ch. 5 - Evaluate the Nusselt number for flow over a sphere...Ch. 5 - 5.4 Evaluate the Stanton number for flow over a...Ch. 5 - Evaluate the dimensionless groups hcD/k,UD/, and...Ch. 5 - 5.6 A fluid flows at 5 over a wide, flat plate 15...Ch. 5 - 5.7 The average Reynolds number for air passing in...Ch. 5 - Prob. 5.8PCh. 5 - When a sphere falls freely through a homogeneous...Ch. 5 - 5.10 Experiments have been performed on the...
Ch. 5 - 5.13 The torque due to the frictional resistance...Ch. 5 - The drag on an airplane wing in flight is known to...Ch. 5 - 5.19 Suppose that the graph below shows measured...Ch. 5 - Engine oil at 100C flows over and parallel to a...Ch. 5 - For flow over a slightly curved isothermal...Ch. 5 - Air at 20C flows at 1 m/s between two parallel...Ch. 5 - Air at 1000C flows at an inlet velocity of 2 m/s...Ch. 5 -
5.43 A refrigeration truck is traveling at 130...Ch. 5 - The air-conditioning system in a Chevrolet van for...Ch. 5 - Determine the rate of heat loss from the wall of a...
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- Engine oil at 100C flows over and parallel to a flat surface at a velocity of 3 m/s. Calculate the thickness of the hydrodynamic boundary layer at a distance 0.3 m from the leading edge of the surface.arrow_forwardFor the steady flat plate boundary layer flow, determine the wall shear stress assuming the following velocity profile. Where, δ is the boundary layer thickness and U is the outer flow velocity (constant).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.arrow_forward
- Water at 10°C flows over a 4.8-m-long flat plate with a velocity of 1.15 m/s. If the width of the plate is 6.5 m, calculate the average friction coefficient over the entire plate. (Water properties at 10°C are: ? = 999.7 kg/m3, ? = 1.307 × 10−3 kg/m·s.) (a) 0.00288 (b) 0.00295 (c) 0.00309 (d ) 0.00302 (e) 0.00315arrow_forwardUsing linearized theory, calculate the lift and drag coefficients for a flat plate at a 5◦ angle of attack in a Mach 3 flow.arrow_forwardThe forming section of a plastics plant puts out a continuous sheet of plastic that is 1.2 m wide and 2 mm thick at a rate of 18 m/min. The sheet is subjected to airflow at a velocity of 4 m/s on both top and bottom surfaces normal to the direction of motion of the sheet. The width of the air cooling section is such that a fixed point on the plastic sheet passes through that section in 2 s. Using properties of air at 1 atm and 60°C, determine the drag force the air exerts on the plastic sheet in the direction of airflow.arrow_forward
- Air is flowing at a speed of 5 m/sec between two parallel flat plates. The air temperature is 20o C and its pressure is 1 atm. The plates are kept at a constant temperature of 90o C and the distance between them is 60 cm. The plates width is 1 m and their length is 1.5 m. What is the electrical power required to keep the plates at constant temperature?arrow_forwardAir at a temperature of 20 oC flows at a speed of 10 m/s through a rectangular duct made of wrought iron with a cross section of 30 cm x 50 cm and a length of 20 m. Calculate the required fan powerarrow_forwardAft of the transition point between laminar and turbulent flow A. the boundary layer gets thinner and the speed increases B. the boundary layer thickens and the speed decreases C. the mean speed increases and the surface friction increases D. the mean speed increases and the surface friction decreasesarrow_forward
- Consider a flat plate at zero angle of attack in an airflow at standard sea level conditions (p∞ = 1.01 × 105 N/m2 and T∞ = 288 K). The chord length of the plate (distance from the leading edge to the trailing edge) is 2 m. The planform area of the plate is 40 m2. At standard sea level conditions, μ∞ = 1.7894 × 10−5 kg/(m)(s). Assume the wall temperature is the adiabatic wall temperature Taw. Calculate the friction drag on the plate assuming a turbulent boundary layer for a freestream velocity of (a) 100 m/s, and (b) 1000 m/s.arrow_forwardLight 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_forwardAir is flowing past a spherical ball. Is the lift exerted on the ball zero or nonzero? Answer the same question if the ball is spinning.arrow_forward
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