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Which of the following statements is/are CORRECT regarding the flow of fluid? a) All fluid layers are parallel to each other in case of turbulent flow. b) The Reynold’s number is less than 2000 for turbulent flow and greater than 4000 for laminar flow. c) Two fluid layers don’t cross each other in case of laminar flow
Two involute gears are designed to mesh for a given centre distance and a given angular velocity ratio (other than 1). During assembly, the centre distance has increased slightly. Then which of the following changes occur? (i) Velocity ratio changes (ii) Pressure angle changes (iii) Pitch circle diameter changes (iv) Working depth changes (v) Base circle radius changes Select the correct answer using the code given below.
During fully developed laminar flow in a circular pipe, the velocity profile is parabolic, and symmetric around the axis. The velocity at the tube wall is zero. The ratio of the average velocity to the maximum velocity is
The Velocity at which flow changes from viscous to turbulent is called __________ velocity.
Mundel's classes of change includes
1. Changes in body motions and positions
2. Changes in equipment and working arrangements
3. Changes in production sequence
4. Changes in finished product
5. Changes in raw material
Ambient air at 20 degree Celsius flows past a flat plate with a sharp leading edge at 3 m/s. The plate is heated uniformly throughout its entire length and is maintained at a surface temperature of 40 degree Celsius. Calculate the distance from the leading edge at which the flow in the boundary layer changes from laminar to turbulent conditions. Assume that transition occurs at a critical Reynolds number of 500000
Consider the following statements: 1) At low Reynolds numbers of any flow, viscous forces dominate over inertial forces. 2) Transition from laminar to turbulent flow occurs over a range of Reynolds numbers depending on the surface presented to the flow. Which of the above statements is/are correct?
Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the
Change in boundary layer from laminar to turbulent is directly affected by (i) Roughness of plate (ii) Pressure gradient (iii) Intensity of turbulence (iv) Velocity of flow Which of the above-mentioned option(s) is/are incorrect?
The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow)