Problem 2: Consider Crude Oil flowing over a flat plate with a free stream velocity of 30 m/s. If the plate is 3 m long and 1 m wide, determine the friction drag on the plate. Is the flow laminar, turbulent or mixed? If flow the mixed, computed the drag force related to the laminar portion and the turbulent component. If the flow is entirely laminar or turbulent just provide the total drag force. 30 m/s -3 m Friction drag coefficient is known be the following: 1.328 CDf- Rej < 5(105) √REL CD 0.455 (logio Rej)2.58 1700 REL 5(10³) ReL <10° Physical Properties of Liquids at Standard Atmospheric Pressure 101.3 kPa, and 20°C (SI Units) Liquid Density p Dynamic Viscosity Kinematic Viscosity Surface Tension a (Nim) (kg/m³) (N-/m³) v (m/s) Ethyl alcohol 789 1.19(10) 1.51 0.0229 Gasoline 726 0.317(10) 0.437(10) 0.0221 Carbon 1590 0.958(10) 0.603(10) 0.0269 tetrachloride Kerosene 814 1.92(10) 2.36(10) 0.0293 Glycerin 1260 1.50 1.19(10) 0.0633 Mercury 13 550 1.58(10) 0.117(10) 0.466 Crude oil 880 30.2(10) 0.0344(10)

Problem 2: Consider Crude Oil flowing over a flat plate with a free stream velocity of 30 m/s. If the plate is 3 m long and 1 m wide, determine the friction drag on the plate. Is the flow laminar, turbulent or mixed? If flow the mixed, computed the drag force related to the laminar portion and the turbulent component. If the flow is entirely laminar or turbulent just provide the total drag force. 30 m/s -3 m Friction drag coefficient is known be the following: 1.328 CDf- Rej < 5(105) √REL CD 0.455 (logio Rej)2.58 1700 REL 5(10³) ReL <10° Physical Properties of Liquids at Standard Atmospheric Pressure 101.3 kPa, and 20°C (SI Units) Liquid Density p Dynamic Viscosity Kinematic Viscosity Surface Tension a (Nim) (kg/m³) (N-/m³) v (m/s) Ethyl alcohol 789 1.19(10) 1.51 0.0229 Gasoline 726 0.317(10) 0.437(10) 0.0221 Carbon 1590 0.958(10) 0.603(10) 0.0269 tetrachloride Kerosene 814 1.92(10) 2.36(10) 0.0293 Glycerin 1260 1.50 1.19(10) 0.0633 Mercury 13 550 1.58(10) 0.117(10) 0.466 Crude oil 880 30.2(10) 0.0344(10)

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.24P: Engine oil at 100C flows over and parallel to a flat surface at a velocity of 3 m/s. Calculate the...

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Two large fixed parallel planes are 12 mm apart. The space between the surfaces is filled with oil of viscosity (0.972 Pa.s). A flat thin plate 0.25 m² area moves through the oil at a velocity of 0.3 m/s. Calculate the drag force: (i) When the plate is equidistant from both the planes, and (ii) When the thin plate is at a distance of 4 mm from one of the plane surfaces. 12 mm Plate Fixed parallel plane 6 mm 6 mm 0.3 m/s 12 mm 8 mm 4 mm 0.3 m/s F
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Two large fixed parallel planes are 12 mm apart. The space between the surfaces Example is filled with oil of viscosity 0.972 N.s/m². A flat thin plate 0.25 m² area moves through the oil at a velocity of 0.3 m/s. Calculate the drag force: (1) When the plate is equidistant from both the planes, and (ii) When the thin plate is at a distance of 4 mm from one of the plane surfaces. Fixed parallel plane 6 mm Plate 0.3 m/s F 6 mm 12 mm
b. A smooth thin plate 5 m long and 1 m wide is placed in air streamed moving at 3 m/s with its length parallel with the flow. Analyse the drag force on each side of the plate. The density of the air is 1.2 kg/m3 and the kinematic viscosity is 1.6 x 10-5 m²/s.
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B9
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Q1: Find the boundary layer thickness (8) equation, the shear stress (to) and the coefficient of drag (C₁) if the velocity distribution in the laminar boundary layer over the face of a spillway was observed to be: (40%) 2 5 --0-0-0) = 2 + Then calculate the boundary layer thickness and drag force if the air flows over a sharp edged flat plate 0.25m long and 0.5m wide at a velocity 1 m/s, take the air density 1.23 kg/m³ and the kinematic viscosity is 1.46*10-5 m/s².
Qustion. An aircraft is flying in level flight at a speed of 200 km/h through air (density, p = 1.2 kg/m³, and viscosity, μ = 1.6 x 10-5 N-s/m²). The lift coefficient at this speed is 0.4 and the drag coefficient is 0.0065. The mass of the aircraft is 800 kg. The effective lift area of the aircraft NOTE= Do not give wrong answer I will dislike , If not sure skip it
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Question # 3 Air at 15 °C flows at V = 5 m/s over a flat plate of length L= 6 m and width W = 2 m. Calculate the distance from leading edge to the point where the boundary layer is turned from laminar to turbulent for the following cases: a. Surface of plate is smooth. b. Surface of plate is rough. Also calculate the drag force acting on one side of plate for each case. V = 5 m/s 6 m