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 5.24P
Engine oil at 100°C flows over and parallel to a flat surface at a velocity of 3
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Fluid mechanics
Air at 30oC (density=1.165 kg/m3, kinematic viscosity = 16x10-5 m2/s) flows over a flat plate at a free stream velocity of 4.19 m/s. Determine the boundary layer thickness at distances of 0.2m, 0.5 m and 0.8 m. Also determine the skin friction coefficients, both local and average, at these locations.
Evaluate the boundary-layer shape factor, H.
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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- Consider a laminar flow over a flat plate of length L = 1m. The boundary layer thickness at the end of the plate is dw for water, and 6, for air for the same free stream velocity. If the kinematic viscositics of water and air arc 1x106 m/s and 1.6x10-5 m/s. respectively, the numerical value of the ratio, warrow_forwardWater 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_forwardWater at 10°C flows over a 1.1-m-long flat plate with a velocity of 0.55 m/s. If the width of the plate is 2.5 m, calculate the drag force acting on the top side of the plate. (Water properties at 10°C are: ? = 999.7 kg/m3, ? = 1.307 × 10−3 kg/m·s.) (a) 0.46 N (b) 0.81 N (c) 2.75 N (d ) 4.16 N (e) 6.32 Narrow_forward
- Engine oil at 40°C flows over a 20-m-long & 3-m-wide smooth flat plate with a free-stream velocity of 50 m/s. Determine the drag force acting on upper side of the plate when:a) Flow is parallel to plate length.b) Flow is parallel to plate width.arrow_forwardWhat’s the correct answer for this please?arrow_forwardWhat’s the correct answer for this please?arrow_forward
- A submarine can be treated as an ellipsoid with a diameter of 5 m and a length of 25 m. The submarine is cruising horizontally and steadily at 65 km/h in seawater (p = 1025 kg/m³.p = 0.00108 Ns/m2). Determine: The Reynolds number for the submarine and state whether the flow is in the laminar or turbulent regime. ii. The drag force on the submarine. iii. The power required to overcome the drag force. To surface, a total lift force of 1000 kN is required from a pair of NACA 0012 hydroplanes. Each hydroplane has a chord length of 1 m and a iv. span of 3 m. What angle of attack should be used?arrow_forwardWater at 25°C is flowing over a flat plate creating a turbulent boundary layer. A distance of 1 cm from the flat plate surface is marked with x. Determine the local velocity at x when the local shear stress is given to be 0.2N/m². Provide a simple justification on how you come up with your findings.arrow_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
- Q1- Air at 27°C and 1 atm flows over a flat plate at a speed of 2 m/s. Calculate the boundary- layer thickness at distances of 20 cm and 40 cm from the leading edge of the plate. The viscosity of air at 27°C is 1.85×105 kg/m. s. density of air 1.177kg/m³arrow_forwardThank You!arrow_forwardAtmospheric air is in parallel flow (u∞ = 10 m/s, T = 15°C) over a flat heater surface that is to be maintained at a temperature of 90°C. The heater surface area is 0.25 m², and the airflow is known to induce a drag force of 0.17 N on the heater. What is the electrical power, in kW, needed to maintain the prescribed surface temperature? Use the modified Reynolds or Chilton-Colburn analogy. Evaluate properties for the air at 325 K. q= i kWarrow_forward
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