1989 Fiscal Year Final Research Report Summary
On Transportation System Utilizing Drag Force Generated by Boundary Deformations
| Project/Area Number |
62550135
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Fluid engineering
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
NAKATANI Hitoshi University of Osaka Prefecture, College of Engineering, Assistant Professor, 工学部, 講師 (90081223)
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| Project Period (FY) |
1987 – 1989
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| Keywords | Unsteady Forces / Slender Body / Tube / Blockage Effect / Asymptotic Expansions / Deformations in Body Surface and Tube Wall |
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| Research Abstract |
Recently, considerable interests have been shown in the transportation system utilizing peristaitic flows generated by a sinusoidal wave motion of a boundary. Then, it is also an interesting problem to consider unsteady drag forces (thrusts) on a body in a tube when the body surface or the tube wall behave arbitrary deformations, and to examine whether the transportation system by the forces is possible or not. Thus, the following three cases are considered for this three years; the first case is the force on the body of revolution capable of arbitrary radial deformations in the tube, the second is the force on the body in the tube behaving a sinusoidal wave motion and the third is the force on the body by the deformations of both body surface and tube wall, where the radius of the tube is the same order as that of the body in three cases.
It is analyzed on two characteristic times for the deformation, that is, fast and slow streams. Accurate numerical treatment for these flows are difficult. However, if the body is slender, the solution can be found approximately.
From analytic results for three years, drag forces acting on the body have much larger values in deformations of the tube wall and both body surface and tube wall than in the body surface deformation. The drag force by the tube wall deformation is the same value as that by the deformations of both body surface and tube wall. And also it takes larger values in slow stream than in fast stream. Wave lengths in the tube deformation greatly affect the drag force. Thus, it is thought that the transportation system by the sinusoidal wave motion of the tube wall is possible.
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