97年 - 97 淡江大學轉學考流體力學#55797

科目：研究所、轉學考(插大)-流體力學 | 年份：97年 | 選擇題數：0 | 申論題數：9

試卷資訊

所屬科目：研究所、轉學考(插大)-流體力學

選擇題 (0)

申論題 (9)

(a) Vorticity and Circulation

(b) Turbulent Flow and Laminar Flow

(c) Lagrangian and Eulei ian Approaches of Fluid Motion

(d) Velocity Potential and Stream Function

(e) Inviscid Flow and Viscous Flow

【已刪除】2. The mass conservation equation lias Ihe form

. Do we need to assume the flow is “steady” in order to derive the incompressible flow continuity equation? Please discuss and derive it. (20%)

3. Please explain the definition and physical meaning of flow streamline in details. Why these streamlines can be treated as “solid boundaries”？ Can we simply just assume the “noslip” boundary condition on these streamlines? Explain why. (20%)

【已刪除】4. At low Reynolds number, the volume flow rate Q through a small tube is only a function of (he tube radius R, Ihe fluid viscosity p., and the pressure drop per unit tube length dP/dx. Now derive this function Q=f(RJ fj. ,dP/dx) through the dimensional analysis. (Hint;

isNavier-Stokes equation) (20%)

【已刪除】5. Air flow steadily belween Iwo sections in a long, straight portion of 4-inch inner diameter pipe as shown in the diagram. The uniformly distributed temperature and pressure at each section are given, [f the average air velocity (non-uniform distribution) at section (2) is l000ft/s, please calculate the average air velocity at section (1). (20%)