| Author | Khan, A. K. M. Hamidur Rahman |
| Call Number | AIT Thesis no. 109 |
| Subject(s) | Fluid dynamics
|
| Note | A thesis submitted in partial fulfillment if the requirements for the degree of Master of Engineering in the SEATO Graduate School of Engineering, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | This study investigates the influence of non-uniform approach velocity on the drag characteristics of hemispheres and cones. Wind tunnel experiments were conducted to evaluate how different definitions of drag coefficient reflect the effect of velocity non-uniformity.
When the drag coefficient is defined based on the velocity at the height of the body:
C_D = 2F_D / (ρ * v_k^2 * A)
the results show that C_D decreases as the non-uniformity of the approach velocity increases.
Alternatively, when the drag coefficient is referenced to the local stagnation pressure:
C_Dk = 2F_D / (ρ * v^2 * dA)
the value of C_Dk increases with greater non-uniformity of the flow field.
The findings indicate that the second definition, C_Dk, provides a more consistent and reliable correlation between drag coefficient and the degree of velocity non-uniformity. Therefore, C_Dk is recommended for characterizing drag in non-uniform flow fields. |
| Year | 1965 |
| Type | Thesis |
| School | Student Research Before 1979 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Dr. J. A. Roberson; |
| Examination Committee(s) | Dr. N.L. Ackermann;Dr. Niwat Daranandana;Dean Milton E. Bender, Jr.; |
| Degree | Thesis (M.Eng.) - SEATO Graduate School of Engineering |