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批踢踢實業坊 Examination 板
 
Re: [考題]流體力學
Dec 16th 2014, 21:26, by efrit

作者efrit ((^o^))

看板Examination

標題Re: [考題]流體力學

時間Tue Dec 16 21:26:08 2014

: 推 Lastwisher: http://i.imgur.com/HdVTjbs.jpg 12/16 20:21
: → Lastwisher: http://i.imgur.com/gkLml3Z.jpg 12/16 20:22
: → Lastwisher: 那如果像這題他不就沒守恆了嗎,好奇問一下你是貓大嗎 12/16 20:23 一樣先考慮連續方程式 Q=V1A1=V2A2 由上式推得V1=(A2/A1)V2 因為題目已述明水槽斷面遠大於管斷面 亦即 A1>>A2 我們可以假設 d1=1ft 那麼 A2/A1=(d2/d1)^2=(0.004/1)^2=0.000016 所以 V1=0.000016*V2 已經很接近0了 再代入能量方程式的 (V1^2)/(2g)項 就變成 0.000000000256*(V2^2)/(2g) 這麼小的值完全可以忽略 -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 122.117.77.171 ※ 文章網址: http://www.ptt.cc/bbs/Examination/M.1418736371.A.F9D.html

→ top1133: 高手 12/16 21:32

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