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 5.29P
Air at 20°C flows at 1
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Consider two different flows over geometrically similar airfoil shapes,one airfoil being twice the size of the other. The flow over the smallerairfoil has freestream properties given by T∞ = 200 K, ρ∞ = 1.23 kg/m3,and V∞ = 100 m/s. The flow over the larger airfoil is described byT∞ = 800 K, ρ∞ = 1.739 kg/m3, and V∞ = 200 m/s. Assume thatboth μ and a are proportional to T 1/2. Are the two flows dynamicallysimilar?
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Imagine a plate 1 m long by 1 m wide at a temperature of 80 °C. Water is passed over its surface at a speed of 1 m/s with a temperature of 40 °C.Calculate the heat dissipated by the plate. Assume the following properties of water at 60 °C: k=0.651 W/mK, Pr=3.02, v =0.478 x 10-6 m²/s.
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 40°C flows over a 20-m-long & 3-m-wide smooth flat plate with a free-streamvelocity 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. kindly give me the correct solution.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_forwardAir 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_forward
- Show that when laminar flow occurs with mean velocity um between extensive stationary flat plates the mean kinetic energy divided by mass of the fluid is 1.543 Um/2.arrow_forwardQ4 : Air is flowing over a long flat plat velocity 8 m/s . Determine the distance from the leading edge of the plate where the flow become turbulente , and the thickness of the boundary layer at that location . Take the properties for air: k = 0,02735 W/m.°C , v= 1.798 × 10°m²/s , Pr = 0.7228arrow_forwardAir ( density :1,2 kg /m3 viscosity : 1.5x10-5 m2 /s ) flows over a flat plate of length 2,5 m and width 1 m at a test speed of 1,5 m/s. Determine the approximate magnitude of frictional force, F . (Flat plate is totally submerged in air and both surfaces of it are of same surface quality )ANSWER: F = 0,017955 Narrow_forward
- Air at 20°C and 1 atm flow past the flat plate in Fig.under laminar conditions. There are two equally spacedpitot stagnation tubes, each placed 2 mm from the wall.The manometer fluid is water at 20°C. If U = 15 m/s andL = 50 cm, determine the values of the manometer readingsh1 and h2, in mm.arrow_forwardA 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_forwardYou are watching air flow over a smooth flat plate with a width of 5.0 meters. Noticing that the inlet air has a uniform flow with velocity of 10.8 m/s, while downstream a boundary layer is formed with a height of 2 cm. Measuring it, the velocity profile of the boundary layer is u(y) = 10(30y - 100y2) m/s. You imagine a rectangular box around the flow and wonder if mass is crossing the upper boundary (see diagram below). You cant decide if mass is entering or leaving the upper boundary, so you decide to calculate it. How much air is entering/leaving the control volume thru the upper surface?arrow_forward
- Consider an aerofoil in a free stream with a velocity of 50 m/s at standard sea-level conditions. At a point on the aerofoil, the pressure is 9.5 x 104 N/m². What is the pressure coefficient at this point?arrow_forwardProblem 3. Air at 20°C and 1 atm (p= 1.2 kg/m³ and µ= 1.8×10¹5 kg/(m-s)) flows at 3 m/s past a sharp flat plate 2 m wide and 1 m long. Determine: a) the boundary layer thickness and the wall shear stress at the end of the plate b) the air velocity at a point 4.5 mm normal to the end of the plate c) the total friction drag on both sides of the platearrow_forwardA square block is weighing 300 N and having a length of 20 cm on one edge slips on a 20° inclined surface in which there is a film of SAE 30 at 10°C oil. What is the terminal velocity of the block down the incline if the oil thickness at this condition is 1 mm?arrow_forward
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