FP최종
- 최초 등록일
- 2014.10.31
- 최종 저작일
- 2014.04
- 14페이지/ 한컴오피스
- 가격 1,000원
목차
1. Objective
2. THEORY
1) Boundary Layers
2) Boundary Layers Formation
3) Boundary Layers in Pipes
4) Boundary Layers Separation
3. EXPERIMENTAL EQUIPMENTS
4. Experimental procedures
5. RESULT
6. RESULT
7. DEBATE AND DISCUSSION
본문내용
2) Boundary Layers Formation
Above we noted that the boundary layer grows from zero when a fluid starts to flow over a solid surface. As is passes over a greater length more fluid is slowed by friction between the fluid layers close to the boundary. Hence the thickness of the slower layer increases.
As the boundary layer thickness becomes greater, so the velocity gradient become smaller and the shear stress decreases until it is no longer enough to drag the slow fluid near the surface along. Up to this point the flow has been laminar and Newton's law of viscosity has applied. This part of the boundary layer is known as the laminar boundary layer.
Fluid from the fast moving region moves to the slower zone transferring momentum and thus maintaining the fluid by the wall in motion. Conversely, slow moving fluid moves to the faster moving region slowing it down. The net effect is an increase in momentum in the boundary layer. We call the part of the boundary layer the turbulent boundary layer.
참고 자료
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