곡관에서 층류맥동유동의 유동특성에 관한 연구 = A Study on Flow Characteristics of Laminar Pulsating Flows in a curved Pipe

다국어 초록 (Multilingual Abstract)

The flow characteristics of laminar pulsating flows are studied experimentally in a curved pipe. Velocity profiles, wall shear stress distributions and pressure gradients are investigated both analytically and experimentally for fully developed laminar pulsating flows of a curved pipe. Velocity profiles and pressure gradients in a curved pipe flow are measured over ranges of Reynolds number and dimensionless frequencies.
A laminar pulsating flow in a curved pipe was analyzed solution and following conclusions were obtained:
1) In the case of large flow rate ratio, the axial velocity has maximum value a little outside of center of the pipe for a small Womersley number.
2) When the flow rate trtio becomes smaller, two pairs of vortices are found thorugh a cycle. The wall shearing stress has large value at the outer wall and outside of upper and lower walls.
3) As η decreases, the velocity profile becomes similar to one in the steady flow.
4) As the Wormersly number becomes 10, some of the secondary vortices disappear and new vortices which repeat combination and disjunction are formed in the cross section.

목차 (Table of Contents)

• 1. 서론
• 2. 이론해석
• 3. 실험
• 4. 결과 및 고찰
• 5. 결론