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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What fluid property is responsible for the development of the velocity boundary layer? What is the effect of the velocity on the thickness of the boundary layer?
Aft 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 decreases
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
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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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- During a winter day, wind at 58 km/h, 5°C, and 1 atm is blowing parallel to a 3.5-m-high and 9-m-long wall of a house. Approximating the wall surfaces as smooth, determine the friction drag acting on the wall. What would your answer be if the wind velocity has doubled? How realistic is it to treat the flow over side wall surfaces as flow over a flat plate?arrow_forwardA circular sign has a diameter of 52 cm and is subjected to normal winds up to 160 km/h at 10°C and 100 kPa. Determine the drag force acting on the sign. Also, determine the bending moment at the bottom of its pole, whose height from the ground to the bottom of the sign is 1.5 m. Disregard the drag on the pole.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_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_forwardA fluid with a constant density of 961 kg/m3 and a constant viscosity of 1.419×10-3 Kg/m.s is flowing over a flat plate at a stream free velocity of 0.87 m/s. If the plate has a length of 2 m, answer the following: 1.What is Reynolds number at a point that is (1/4)L down the entrance? 2.Is the flow laminar or turbulent? 3.Calculate the thickness of the boundary layer in mm at (1/4)L down the entrance 4.Calculate the drag coefficient at (1/4)L down the entrancearrow_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
- Calculate 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_forwardWhat is the effect of streamlining on (a) friction drag and (b) pressure drag? Does the total drag acting on a body necessarily decrease as a result of streamlining? Explain.arrow_forwardConsider laminar flow over a flat plate. How does the local friction coefficient change with position?arrow_forward
- Calculate thickness of the boundary layer (in metre) under laminar flow condition when distance from the upstream edge is 2.15 metre and local Reynolds number is 3000. Write the final answer in the box below.arrow_forwardConsider a refrigeration truck traveling at 70 mi/h at a location where the air is at 1 atm and 80°F. The refrigerated compartment of the truck can be considered to be a 9-ft-wide, 8-ft-high, and 20-ft-long rectangular box. Assuming the airflow over the entire outer surface to be turbulent and attached (no flow separation), determine the drag force acting on the top and side surfaces and the power required to overcome this drag.arrow_forwardExplain briefly in your own words (parts a-d)a) Why doesn’t the surface roughness affect the pressure drop in a laminar pipe flow? b) For bluff bodies, the drag coefficient decreases abruptly when the flow becomes turbulent. Why? c) Consider a spinning ball (in the clockwise direction) moving with a velocity U. Explain how the lift force is formed on the ball and show its direction. Uwd) For flow over streamlined bodies, drag force usually increases when the flow becomes turbulent.Why? e) Consider a pipe with a radius R and length L (extending from (1) to (2)). Inside the pipe there is a solid cylinder with a radius k×R (k 1). The planes (1) and (2), separated by a distance L have pressures P1 and P2 respectively, with P1 > P2. At t = 0, the inner solid cylinder suddenly begins to be pulled at a constant speed U in the negative z direction. Thefluid is an incompressible Newtonian liquid with dynamic viscosity μ and density ρ. In orderto find the solution for the velocity field in…arrow_forward
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