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Test: Boundary Layer Theory - 3


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10 Questions MCQ Test Fluid Mechanics | Test: Boundary Layer Theory - 3

Test: Boundary Layer Theory - 3 for Mechanical Engineering 2022 is part of Fluid Mechanics preparation. The Test: Boundary Layer Theory - 3 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Boundary Layer Theory - 3 MCQs are made for Mechanical Engineering 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Boundary Layer Theory - 3 below.
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Test: Boundary Layer Theory - 3 - Question 1

The hydrodynamic boundary layer thickness is defined as the distance from the surface where the

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Hydrodynamic boundary layer thickness is defined as the distance measured in the y direction from boundary to the point where the velocity is 99% of the free stream velocity.

Test: Boundary Layer Theory - 3 - Question 2

Laminar boundary layer thickness (δ) at any point x for flow over a flat plate is given by δ/x

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From the Blasius solution

Test: Boundary Layer Theory - 3 - Question 3

The velocity profile for turbulent layer over a flat plate is

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Turbulent velocity profile follows 1/7 power law, hence

will be velocity distribution.

Test: Boundary Layer Theory - 3 - Question 4

The turbulent boundary layer thickness varies as

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For turbulent flow

Test: Boundary Layer Theory - 3 - Question 5

According to Blasius, the local skin friction coefficient in the boundary layer over a flat plate is given by

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Local skin friction coefficient

Test: Boundary Layer Theory - 3 - Question 6

The thickness of laminar boundary layer at a distance 'x' from the leading edge over a flat plate varies as

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Test: Boundary Layer Theory - 3 - Question 7

The Von-karman momentum integral equation expressed as (where θ is momentum thickness)

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Von-karman momentum integral equation is expressed as

Test: Boundary Layer Theory - 3 - Question 8

Consider the following statements:
Boundary layer separation is caused by:
1. An adverse pressure gradient
2. Sudden entrapping of air
3. Reduction of pressure gradient to zero
4. Release of bubbles from the fluid when the pressure goes below the vapor pressure

Q. Which of the above statements is/are correct?

Test: Boundary Layer Theory - 3 - Question 9

Air flows past a golf bail of 20 mm radius. It is observed that the boundary layer becomes turbulent at Reynolds number of 2 x 105. If the kinematic viscosity of air is 1.5 x 10-5 m2/sec then the speed of air when the flow becomes turbulent is

Detailed Solution for Test: Boundary Layer Theory - 3 - Question 9

Test: Boundary Layer Theory - 3 - Question 10

Blasius equation for a flat plate laminar boundary layer flow is a third order​

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