Bissoy.com
Doctors Medicines MCQs Q&A

The boundary layer exists in which of the following ?

The boundary layer exists in which of the following ? Correct Answer Flow of real fluids

Explanation:

A boundary layer is a thin layer of viscous fluid (Real fluid) close to the solid surface of a wall in contact with a moving stream.

i.e.  Boundary layer exists in the flow of real fluids.

  • In scientific terms, A boundary layer is a thin region in the fluid adjacent to a surface where velocity and temperature gradients normal to the surface are significant.
  • The difference in velocity between adjacent layers of the fluid is known as a velocity gradient.
  • The difference in temperature between adjacent layers of the fluid is known as a temperature gradient.
  • The boundary layer thickness (δ) is the distance across a boundary layer from the wall to a point where the flow velocity has essentially reached the free stream velocity.
  • Thus velocity gradient will be large and at the surface, due to less velocity difference, it will be a thin shear layer.

[ alt="F2 A.M Madhu 06.05.20 D4" src="https://storage.googleapis.com/tb-img/production/20/05/F2_A.M_Madhu_06.05.20_D4.png" style="width: 375px; height: 186px;">

  • Similarly, the thermal boundary layer exists in heat transfer.
  • Multiple types of boundary layers can coexist near a surface simultaneously. 

Related Questions

Some small cubes of same height 7 cm but variable length and width are put inside a large cuboid of height 21 cm. Length and width of cuboid is 32 cm and 24 cm, respectively. Small cubes are put such that cubes at the bottom most layer is of similar base area; second layer contains all the cubes of similar base area and third layer have all the cubes of similar base area. Which of the following statement(s) given below is / are TRUE? A: If side of each small cubes at bottom most layer is 8 cm, then maximum number of small cubes that can be put at bottom most layer is 12. B: If maximum of 48 cubes can be put at second layer, then side of each cube at second layer is 6 cm. C: If side of each small cubes at third layer is 1.6 cm, then maximum number of small cubes that can be put at third layer is 300.
The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is (Assume that boundary layer is entirely laminar)
A wave is first reflected by a boundary P and then by a boundary Q without dissipating energy. If the boundary P is rigid and the boundary Q is non-rigid, then find the fraction of the amplitude of the reflected wave by boundary P to the reflected wave by boundary Q.
If, f: A → B and g: B → C. Then which of the following statements are true: 1. f o g exists and it is a function on B. 2. g o f exists and it is function from A to C. 3. f o g does not exists. 4. g o f does not exists.
The nature of normal grain growth in the presence of a second phase deserves special consideration. The moving boundaries will be attached to the particles exert a pulling force on the boundary restricting its motion. Therefore if the boundary intersects the particle surface at 90° the particle will feel a pull of (2πrγcosΘ)*sinΘ. This will be counterbalanced by an equal and opposite force acting on the boundary. As the boundary moves over the particle surface Θ changes and the drag reaches a maximum value, this happens when Θ becomes______
Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton's law of viscosity.(II) Newton's second law of motion. (III) The continuity equation.(IV) Velocity of boundary layer must be zero relative to boundary.(V) Fluid cannot penetrate a boundary.
Which of the following must be followed by the flow of a fluid (real or ideal)?
(I) Newton's law of viscosity.
(II) Newton's second law of motion.
(III) The continuity equation.
(IV) Velocity of boundary layer must be zero relative to boundary.
(V) Fluid cannot penetrate a boundary.
The calculation of heat transmission by convection is based on the determination of a Nusselt number or convective film coefficient. To that goal, which of the following strategies have been proposed (i) Non-dimensional analysis and experimental correlations (ii) Hydrodynamic concept of velocity boundary layer (iii) Reynolds similarity between the mechanism of fluid friction in the boundary layer and the transfer of heat by convection Identify the correct one
The determination of a value of Nusselt number or the convective film coefficient forms a basis for the computation of heat transfer by convection. Towards that end, following approaches have been suggested (i) Non-dimensional analysis and experimental correlations (ii) Hydrodynamic concept of velocity boundary layer (iii) Reynolds similarity between the mechanism of fluid friction in the boundary layer and the transfer of heat by convection Identify the correct one
A small thermo-couple is positioned in a thermal boundary layer near a flat plate past which water flows at 30 degree Celsius and 0.15 m/s. The plate is heated to a surface temperature of 50 degree Celsius and at the location of the probe, the thickness of thermal boundary layer is 15 mm. If the temperature profile as measured by the probe is well-represented by t – t S/t INFINITY – t S = 1.5 (y/δ t) – 0.5 (y/δ t) 3 Determine the heat flux from plate to water