In the boundary layer, the flow is: 

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HPCL Engineer Mechanical 04 Nov 2022 Official Paper (Shift 2)
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  1. inviscid and rotational
  2. viscous and rotational
  3. viscous and irrotational
  4. inviscid and irrotational

Answer (Detailed Solution Below)

Option 2 : viscous and rotational
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Detailed Solution

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Explanation:

A very thin layer of fluid in the immediate neighborhood of the solid boundary, where the variation of velocity from zero at the solid boundary to the free stream velocity in the direction normal to the boundary takes place is known as the boundary layer. In this layer, the flow is viscous and rotational.

F2 S.S. N.J. 7.9.2019 D1

Outside the boundary layer, flows can be regarded as ideal, i.e. irrotational and frictionless.

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