8. 承第 7 題,若流體流動造成的管線摩擦損失忽略不計時,試求因管線突然擴大產生能量損 失\( lw_f \)?
(A) \( lw_f = \frac{u_1^2}{2} \left(1 - \frac{D_1}{D_2}\right)^2 \)
(B) \( lw_f = \frac{u_2^2}{2} \left(1 - \frac{D_1}{D_2}\right)^2 \)
(C) \( lw_f = \frac{u_2^2}{2} \left(1 - \frac{D_1^2}{D_2^2}\right)^2 \)
(D) \( lw_f = \frac{u_1^2}{2} \left(1 - \frac{D_1^2}{D_2^2}\right)^2 \)

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