Heat and Mass Transfer: Fundamentals and Applications
5th Edition
ISBN: 9780073398181
Author: Yunus A. Cengel Dr., Afshin J. Ghajar
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 6, Problem 29CP
What fluid property is responsible for the development of the velocity boundary layer? For what kinds of fluids will there be no velocity boundary layer on a flat plate?
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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?
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.
A 10-cm-diameter, 30-cm-high cylindrical bottle contains cold water at 3°C. The bottle is placed in windy air at 27°C. The water temperature is measured to be 11°C after 45 min of cooling. Disregarding radiation effects and heat transfer from the top and bottom surfaces, estimate the average wind velocity.
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Heat and Mass Transfer: Fundamentals and Applications
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- What are the turbulence intensity differences on offshore and onshore?arrow_forwardConsider laminar flow over a flat plate. How does the local friction coefficient change with position?arrow_forwardMercury at 25°C flows over a 3-m-long and 2-m-wide flat plate maintained at 75°C with a velocity of 0.01 m/s. Determine the rate of heat transfer from the entire plate.arrow_forward
- Consider oil flowing along with a flat plate parallelly. The oil flow creates laminar velocity and thermal boundary layers because the oil temperature and plate temperature are different. In general, which boundary layer of the oil is thicker, (1) velocity boundary layer or (2) thermal boundary layer? Answer (1) or (2).arrow_forwardWhat are the three layers within turbulent flow? In which layer is the velocity smallest and in which layer is the turbulent portion of the shear stress dominant?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_forward
- During flow over a given body, the drag force, the upstream velocity, and the fluid density are measured. Explain how you would determine the drag coefficient. What area would you use in the calculations?arrow_forwardWhat is the physical significant of prandtl number? Question does the value of the prandtl number depend on the type of flow, or the flow geometry? Does the prandtl number of air change with pressure? does it change your temperature?arrow_forwardCalculate the heat transfer from a 60 cm x 60 cm plate on which air flows at 40 C and. The plate temperature is 100 C while the air speed is 5 m/s.arrow_forward
- Air at 20oC and 1 atm flows over a flat plate at 35 m/s. The plate is 75 cm long and 100 cm depth and is maintained at 60oC. Calculate (a) velocity boundary layer thickness at the leading edge, (b) thermal boundary layer thickness at the distance of 10 cm from the leading edge, and (c) thermal boundary layer thickness at the trailing edge.arrow_forwardThe airflow at 1 atm has a free stream velocity and temperature of 5 cm/s and 25°C, respectively. Determine the heat flux on the plate surface and the convection heat transfer coefficient of the airflow.arrow_forwardShow the boundary layer development along the plate and define the characteristics of boundary layer from plate to the free stream region in turbulent boundary layer region.arrow_forward
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