HEAT+MASS TRANSFER:FUND.+APPL.
6th Edition
ISBN: 9780073398198
Author: CENGEL
Publisher: RENT MCG
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Chapter 7, Problem 14P
Air at 25°C and 1 atm is flowing over a long flat plate with a velocity of 8 m/s. Determine the distance from the leading edge of the plate where the flow becomes turbulent and the thickness of the boundary layer at that location.
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Chapter 7 Solutions
HEAT+MASS TRANSFER:FUND.+APPL.
Ch. 7 - What is the difference between the upstream...Ch. 7 - What is drag? What causes it? Why do we usually...Ch. 7 - Define the frontal area of a body subjected to...Ch. 7 - Air at 25C and 1 atm is flowing over a long flat...Ch. 7 - Air at 15C and 1 atm flows over a 0.3-m-wide plate...Ch. 7 - Water at 43.3C flows over a large plate at a...Ch. 7 - Prob. 57PCh. 7 - Prob. 97PCh. 7 - Prob. 102P
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- Mercury 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_forward55°C methanol flows over a 4m long 2m width flat plate with temperature of 25°C. The velocity of methanol is 1.08 km/h. Determine the total drag force and the rate of heat transfer from the entire plate. What is the value of x_ and what does it mean?arrow_forwardA thin, flat plate that is 0.2 m × 0.2 m on a side is oriented parallel to anatmospheric airstream having a velocity of 40 m/s. The air is at a temperatureof T∞ = 20°C, while the plate is maintained at Ts = 120°C. The air flows overthe top and bottom surfaces of the plate, and measurement of the drag forcereveals a value of 0.075 N. What is the rate of heat transfer from both sides ofthe plate to the air?arrow_forward
- The passenger compartment of a minivan traveling at 50 mi/h in ambient air at 1 atm and 80°F is modeled as a 4.5-ft-high, 6-ft-wide, and 11-ft-long rectangular box. The airflow over the exterior surfaces is assumed to be turbulent because of the intense vibrations involved. Determine the drag force acting on the top and the two side surfaces of the van and the power required to overcome it.arrow_forwardAir is to be heated by passing it over a bank of 3-m-long tubes inside which steam is condensing at 100°C. Air approaches the tube bank in the normal direction at 20°C and 1 atm with a mean velocity of 5.2 m/s. The outer diameter of the tubes is 1.6 cm, and the tubes are arranged in-line with longitudinal and transverse pitches of SL = ST = 6 cm. There are 20 rows in the flow direction with 10 tubes in each row. Assume the air properties at mean temperature of 35°C and 1 atm. The air properties at the assumed mean temperature of 35°C and 1 atm are k = 0.02625 W/m·K, ρ = 1.145 kg/m3, cp = 1.007 kJ/kg·K, Pr = 0.7268, μ = 1.895 × 10−5 kg/m·s, Prs = Pr@Ts = 100°C = 0.7111.arrow_forwardA 5-mm-diameter electrical transmission line is exposed to windy air. Determine the drag force exerted on a 160-m-long section of the wire during a windy day when the air is at 1 atm and 15°C and the wind is blowing across the transmission line at 50 km/h.arrow_forward
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