A high speed train has a design speed of 120 km/hr. A flat plate of length 200 m with a width of 9 m is used for the simulation of train. Determine the approximate power required to overcome surface frictional resistance . ( Air density :1,2 kg m3 viscosity: 1,5 x 10-5 m2/ s ) ANSWER: 69,6 k W

A high speed train has a design speed of 120 km/hr. A flat plate of length 200 m with a width of 9 m is used for the simulation of train. Determine the approximate power required to overcome surface frictional resistance . ( Air density :1,2 kg m3 viscosity: 1,5 x 10-5 m2/ s ) ANSWER: 69,6 k W

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...

See similar textbooks

Related questions

Q: Discuss the effect of Reynolds number on the thickness of boundary layer flows and the wall shear…

Q: A parachute of hemi-spherical shape allows a parachute jumper of weight 90kg to descend with a…

A: A drag force is the resistance created when a body moves through a fluid like water or air. A drag…

Q: A solid ball is dropped into a water container for cooling. The ball has a diameter of D = 4 mm and…

A: Write the given value for the solid ball using suitable variables. Here D signifies ball diameter,…

Q: A helicopter during a test has its four blades turning at 89 rpm with the blades oriented parallel…

A: Given data:- length of blade=3.5m ρair=1.225 kg/m3 width of blade=200mm…

Q: A pipe bore diameter D and length L has fully developed laminar flow throughout the entire length…

Q: A fluid flow with mean speed 2 m/s flow over plate of 2.5 m length has kinematic viscosity 2×10…

Q: A thin flat plate ( 45 cm X 90 cm ) is immersed in a stream of glycerin (P = 1258 kg/m and u = 1.49…

Q: B2) An automotive engine can be assumed as rectangular block with approximation size 0.4 m high, 0.6…

Q: A thin flat plate ( 45 cm X 90 cm ) is immersed in a stream of glycerin (p = 1258 kg/m' and u = 1.49…

Q: Water flows at a velocity of 1.2 m/s over a flat plate 1.2 m long. Assume 1/7th power law and…

Q: The standard sea level value of viscosity coefficient for air is μ = 1.7894×10−5 kg/(m · s) = 3.7373…

A: Given data: *The standard level value of viscosity coefficient of air is μ = 1.7894×10−5 kg/(ms)…

Q: A bicycle rider tries to coast for 300 m to complete one full circuit of a nominally flat oval…

A: Given data: Here, mr represents the rider’s mass, mb represents the bike’s mass, and d represents…

Q: A two-dimensional diverging duct is being designed to diffuse the high-speed air exiting a wind…

A: (a) The variation of the with x can be expressed as, The density as a function of x can be…

Q: A slipper-pad bearing with linearly decreasing gap height is being designed for an amusement park…

A: Viscosity can be conceptualized as quantifying the internal frictional force that arises among…

Q: Laminar Flat-Plate Boundary Layer: Exact Solution 9.6 Plot the Blasius solution for the laminar…

A: Given: The velocity profile equation,

Q: Air ( p= 1.2 kg/m³, kinematic viscosity v =1.8 + 10-5 m²/s )flows along a flat plat 3 m long and 1.5…

Q: A wind turbine with two or four hollow hemispherical cups connected to a pivot is commonly used to…

A: Given: The diameter of the cup, d = 8 cm The distance of cup from the pivot, L = 40/2 = 20 cm The…

Q: Derive an expression for turbulent boundary layer thickness over a flat plate

A: Given A turbulent flow in a flat plate To find Turbulent boundary layer expression

Q: A square block weighing 1.1 kN and 250 mm on an edge-slides down an incline (20° with horizontal) on…

Q: D. A thin flat plate ( 45 cm X 90 cm ) is immersed in a stream of glycerin (p = 1258 kg/m and u =…

Q: A thin flat plate ( 45 cm X 90 cm ) is immersed in a stream of glycerin (p = 1258 kg/m and u = 1.49…

Q: m/s support

Q: An aluminium canoe moves horizontally along the surface of a lake at 8.0 mi/h.The temperature of the…

A: Given Data The speed of the canoe is: vc=8 mi/h=11.733 ft/s The temperature of the lake water is:…

Q: Assume that a radioactive dust particle approximates asphere of density 2400 kg/m3. How long, in…

A: (a) It is assumed that Stokes's law is applied for small particles. The dynamics viscosity is taken…

Q: Discuss the following exchange processes between the earth and the atmosphere and the importance of…

A: a.Sensible heat Sensible heat is heat that is transferred from one system to another without…

Q: Explain boundary layer thickness?

A: Boundary layer thickness is described as a vertical distance from the boundary up to the point where…

Q: Qs. An aircraft is flying in level flight at a speed of 200 km/h through air (density, p = 1.2…

Q: 2- Oil with a free stream velocity of 2 m/s flows over a thin plate 2m wide and 2m long. Calculate…

Q: A boundary layer is flowing on a flat plate where the freestream velocity is 24 m/s, and the…

A: Solution: Given Data: U∞=24 m/sv=1.5×10-5 m2/sf=95 HzF=2πfvU∞2

Q: 2. Water flows at a velocity of 1.2 m/s over a flat plate 1.2 m long. Assume 1/7th power law and…

Q: 1.7 A 90 N rectangular solid block slides down a 30° inclined plane. The plane is lubricated by a 3…

Q: In a strait jump line, one of the jumping poles is 130 m high and the other 170 m high. How can the…

Q: e. A 0.5m x 2m flat plate is towed at 5 m/s on a 2-mm-thick layer of SAE-30 oil at 38°C that…

Q: The large block shown is x = 72 cm wide, y = 54 cm long, and z = 9.0 cm high. This block is passing…

A: Given:x=72 cm or 0.72 my=54 cm or 0.54 mz=9 cm or 0.09 mρ=1.43 kg/m3v=8.61 m/s

Q: Air ( density :1,2 kg /m3 viscosity : 1.5x10-5 m2 /s ) flows over a flat plate of length 2,5 m and…

A: Given, ρ = 1.5 kg/m3v = 1.5 × 10-5 m2/sL = 2.5 mW = 1 mV = 1.5 m/s Total area exposed for drag (A)…

Q: A minivan is pulled by a tow truck at 60 kph. The boxlike van is 20m long, 6m high, and 3.75m wide.…

A: Given Velocity, v = 60 km/h = 16.67 m/s Length, L = 20 m Density = 0.0023 kg/m3…

Q: A spherical particle falling at a terminal speed in a liquid must have the gravitational force…

A: Given data: R=0.7 mm=0.7×10-3 mv=8.16 cms=8.16×10-2 msρs=7.86 gmL=7860 kgm3ρl=0.88 gmL=880 kgm3

Q: Which of the following boundary conditions is NOT valid for laminar boundary layer flow over a flat…

A: Since all are different questions and as per the guideline, I an solve one question at a time. For…

Q: -For flow over a slightly curved surface, the local shear stress is given by the relation: 0.5 T,(x)…

A: The local friction co-efficient is a non-dimensional parameter. It gives the idea of frictional…

Q: A 0.5m x 2m flat thin plate is moved at 5m/s on a 2-mm thick layer of SAE 30 oil at 38 degrees…

A: This question is related to the newton law of viscosity. According to this question, the velocity…

Q: A flat plate has been placed longitudinally in a stream of crude oil which flows with a velocity of…

A: Length of the plate, L=500 mm=0.5 mWidth of the plate, w=250 mm=0.25 mVelocity of crude oil, U=6…

Q: c) What is the region for viscous effect important? And how does the boundary layer thickness vary…

Q: The critical Reynolds number makes a distinction between laminar and turbulent flow regimes of…

Q: boundary layer, the shear stress at trailing edge and the drag force on one side of plate 1 m long,…

Q: A 1.5-m-long and 0.5 m wide flat plate is immersed in water flow with velocity of kg 5 m/s. (F= 1000…

A: note : ?as per our company guidelines we are supposed to answer ?️only first 3 sub-parts. Kindly…

Q: Air at 15°C flows at 10 m/s over a flat plate of length 3 m. Using one-seventh power law of the…

A: First, determine the Reynold number for the given flow.

Q: 1 .Water at 15 ºC flows past a 1.5 mm radius small sphere at 5 cm/s. What is most nearly the drag…

A: Data given: Size of the sphere radius ,d= 1.5mm= 0.0015m cross sectional area =…

Question

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

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

Engine oil at 100C flows over and parallel to a flat surface at a velocity of 3 m/s. Calculate the thickness of the hydrodynamic boundary layer at a distance 0.3 m from the leading edge of the surface.
A wind turbine with two or four hollow hemispherical cups connected to a pivot is commonly used to measure wind speed. Consider a wind turbine with four 1-cm-diameter cups with a center-to-center distance of 22 cm, as shown in Fig. 1. The pivot is stuck as a result of some malfunction, and the cups stop rotating. For a wind speed of 20 m/s and air density of 1.25kg/m3, determine the maximum torque this turbine applies on the pivot.
A vertical air stream flowing at a velocity of 100 m/s supports a ball of 60 mm in diameter. Taking the density of air as 1.2 kg/m³ and kinematic viscosity as 1.6 stokes, the weight of the ball that is supported is (if coefficient of drag C= 0.8)
A wind turbine with two or four hollow hemispherical cups connected to a pivot is commonly used to measure wind speed. Consider a wind turbine with four 8-cm-diameter cups with a center-to-center distance of 40 cm, as shown. The pivot is stuck as a result of some malfunction, and the cups stop rotating. For a wind speed of 15 m/s and air density of 1.25 kg/m3 Using appropriate software, investigate the effect of wind speed on the torque applied on the pivot. Let the wind speed vary from 0 to 50 m/s in increments of 5 m/s. Tabulate and plot the results.
A 0.5m x 2m flat thin plate is moved at 5m/s on a 2-mm thick layer of SAE 30 oil at 38 degrees Celsius that separates it from a flat surface. The velocity distribution between the plate and the surface is assumed to be linear. What force is required if the plate and surface are horizontal? (μSAE30 = 0.1 N-s/m2)
flat plate 30 cm by 50 cm slides on oil (μ = 0.8 N⋅s/m2) over a large plane surface. What force is required to drag the plate at 2 m/s, if the separating oil film is 0.5 mm thick?
A minivan is pulled by a tow truck at 60 kph. The boxlike van is 20m long, 6m high, and 3.75m wide. Estimate the skin friction, Df, on the van's top and sides. Take the density and viscosity of air as 0.0023 kg/m3 and 0.3758x10-6 N-s/m2.
A 10-cm shaft rides in a 10.03-cm sleeve and 12-cm long, the clearance space (assumed to be uniform) being filled with lubricating oil (? = 0.11 ?? − ?). Calculate the rate at which heat is generated when the shaft turns at 100 rpm in Watts (W). (Rate of energy = Frictional force/resistance x Velocity)
Water flows at 20°C with a velocity of 1.1 m/s over a flat plate whose length is 15 cm. The boundary layer thickness at the end of the plate is (the density and viscosity of water are 998 kg/m3 and 1.002 × 103 kg/m⋅s, respectively). (a) 1.14 mm (b) 1.35 mm (c) 1.56 mm (d ) 1.82 mm (e) 2.09 mm
A slipper-pad bearing with linearly decreasing gap height is being designed for an amusement park ride. Its dimensions are h0 = 1/1000 in (2.54 × 10−5 m), hL = 1/2000 in (1.27 × 10−5 m), and L = 1.0 in (0.0254 m). The lower plate moves at speed V = 10.0 ft/s (3.048 m/s) relative to the upper plate. The oil is engine oil at 40°C. Discuss what happens when the oil temperature increases significantly as the slipper-pad bearing is subjected to constant use at the amusement park. In particular, would the load-carrying capacity increase or decrease? Why?
Air at 15°C flows at 10 m/s over a flat plate of length 3 m. Using one-seventh power law of the turbulent flow, what is the ratio of local skin friction coefficient for the turbulent and laminar flow cases? (The kinematic viscosity of air is 1.470 × 10−5 m2/s.) (a) 4.25 (b) 5.72 (c) 6.31 (d ) 7.29 (e) 8.54
An expression for the laminar velocity profile on a flat plate is u=C1sin(C2y)+C3 Where the argument of the sine function is in radians. Using the three common physicalconditions that the velocity profile should satisfy, determine d) the skin friction coefficient, Cf as a function of lengthe) displacement thickness (δ*/x) as a function of lengthf) the momentum thickness (θ/x) as a function of lengthg) the drag force (FD) on both sides of the plate