Chemical Engineering - Fluid Mechanics - Discussion
Discussion Forum : Fluid Mechanics - Section 11 (Q.No. 25)
25.
In which of the following body shapes, the pressure drag is large compared to the friction drag ?
Discussion:
4 comments Page 1 of 1.
Bashir said:
5 years ago
Please someone explain this.
Pawan Kumar Sharma said:
2 years ago
If Pr drag > friction drag = Bluff body.
If friction drag > pr drag = streamlined body.
If friction drag > pr drag = streamlined body.
Pawan Kumar Sharma said:
2 years ago
A bluff body is one in which the length in the flow direction is close to or equal to the length perpendicular to the flow direction.
Bodies subjected to fluid flow are classified as being streamlined and blunt/bluff, depending on their overall shape.
A bluff body is defined as a body whose surface does not coincide with the streamlines when placed in a flow. Then the flow is separated from the surface of the body much ahead of its trailing edge with the result of a very large wake formation. Then the drag due to pressure will be very large as compared to the drag due to friction on the body.
Bodies subjected to fluid flow are classified as being streamlined and blunt/bluff, depending on their overall shape.
A bluff body is defined as a body whose surface does not coincide with the streamlines when placed in a flow. Then the flow is separated from the surface of the body much ahead of its trailing edge with the result of a very large wake formation. Then the drag due to pressure will be very large as compared to the drag due to friction on the body.
Pawan Kumar Sharma said:
2 years ago
@All.
On the other hand, when the friction drag is higher than the pressure drag than the body is known as a streamlined body.
On the other hand, when the friction drag is higher than the pressure drag than the body is known as a streamlined body.
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