(4) 什 麼是“no slip condition”? (5 分）

【已刪除】5. Evaluate  (20 poinls)

(1) Wliat is “Fluid”？ What is “fluici mechanics”？ (6 分）

(2)探討流體力學時 ＞ 基本上需利用哪五個定律(law)? (5分）

(3)說明Reynolds number之物理意義°並欽述Reynolds number大小與流場之關聯? (6分）

(5)繪出一 incompressible, viscous flow流經二維圓柱之流線示意圖,標出停滯點及分離點。並凼流體力 學觀點說明高爾夫球之凹洞？ (10分）

(6)在流體力學屮’什麼是 Dimensional Analysis ? 什 麼是 Incomplete similarity ? (10 分）

(a) whellie/' [he How is one-, two-, or tliiee-tlimeoiiiona], and why.

(b) whellier the flow is steady or unsteady, and why.  

【已刪除】(8) The inclined surface shown below, hinged along edge A, is 5 m wide. Determine the resultant force, FK, of the waler and air on Uie inclined surface. (20 分）  Notes: ρ water = 999 kg/m3

【已刪除】(9) Tlie drag of an airfoil at zero angle of attack is liinction of density, viscosity, velocity, and a length parameter. A 1/10 scale model of an airfoii was tested in a wind Uuinel ai a Reynolds ntimber of 5.5x 106, based on chord length. Test conditions in the wind lunnel air stream were 15°C and 10 atm absolute pressure. The prototype aiifoil has a chord length of 2 m, and is to be flown in air at standard conditions. Determine the speed at wliich the wind tunnel model was tested, and the corresponding prototype speed. (20 分)