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[理工] 拉普拉斯方程式

[ Grad-ProbAsk ]1 留言, 推噓總分: +1

作者: superdevil - 發表於 2017/05/18 21:20(7年前)

1^F推ntust661: 都可以阿!05/19 23:58

[理工] [流體力學] 平板間層流

[ Grad-ProbAsk ]37 留言, 推噓總分: +8

作者: prospectof - 發表於 2016/11/25 21:04(7年前)

8^F推ntust661: 其實他想表示fully developed flow吧~11/27 14:26

9^F→ntust661: 所以壓力不再與流經的路徑有關係 dP/dx = 011/27 14:27

12^F推ntust661: 不懂你的意思請看WIKI的說明11/27 23:15

13^F→ntust661: https://en.wikipedia.org/wiki/Entrance_length11/27 23:15

16^F推ntust661: 噢不好意思我說錯了 fully developed flow 應是dV/dx=011/27 23:26

17^F推ntust661: 剛剛翻了一下書有類似的問題11/27 23:33

18^F推ntust661: dP/dx = 0 就是因為假設壓力等於常數才會有的結果11/27 23:37

24^F推ntust661: gap應該是影響dP/dy而非dP/dx吧11/27 23:59

25^F→ntust661: 我書上類似的題目是一個傳輸帶從黏性流體中往上等速移動11/28 00:00

26^F→ntust661: 外面是大氣，而他說dP/dx = 0是因為流體邊界大氣 Patm11/28 00:02

27^F→ntust661: 所以往上x方向的壓力變化率 = 011/28 00:02

28^F→ntust661: dP/dy = 0 則是由y方向的 Navier Stokes eq.反求出來的11/28 00:03

29^F推ntust661: 還有一個想法,假設移動的平板上給予的壓力是P(x)11/28 00:11

30^F→ntust661: 題目說infinite plates,所以你可以在板子上任意取一個11/28 00:12

31^F→ntust661: 座標原點，所以P(x) = P(x+c) = P0 , c = constant11/28 00:14

32^F→ntust661: 故dP/dx = 011/28 00:14

[理工] 91台大機械問題

[ Grad-ProbAsk ]2 留言, 推噓總分: +1

作者: jim510032000 - 發表於 2016/11/25 00:58(7年前)

2^F推ntust661: J分量沒錯阿11/27 15:58

[理工] 反函數

[ Grad-ProbAsk ]1 留言, 推噓總分: +1

作者: chunlin01 - 發表於 2016/11/23 21:07(7年前)

1^F推ntust661: f(g(x))=x, f'(g(x))*g'(x)=1,g'(x)=1/f'(g(x))11/27 14:31

[理工] 最後一次發問動力相似

[ Grad-ProbAsk ]3 留言, 推噓總分: +2

作者: sakishil - 發表於 2016/09/19 13:34(7年前)

1^F推ntust661: po上來看09/19 13:42

3^F推ntust661: 這種多看多背吧09/20 08:58

[理工] 99中央光電工數考題(參閱喻超凡翻轉工程)

[ Grad-ProbAsk ]4 留言, 推噓總分: +1

作者: jack840723 - 發表於 2016/08/18 12:47(7年前)

1^F推ntust661: 他打錯了自己算吧！08/18 18:44

3^F推ntust661: 我錯了他題目分兩段做的樣子XD08/18 20:17

Re: [理工] 97台大環工所工程數學級數解問題

[ Grad-ProbAsk ]1 留言, 推噓總分: +1

作者: jim510032000 - 發表於 2016/08/16 23:18(7年前)

1^F推ntust661: 才能展開啊08/16 23:09

2^F推ntust661: 他沒有錯自己看一下次方有沒有寫錯08/18 00:40

[理工] 97台大環工所工程數學級數解問題

[ Grad-ProbAsk ]1 留言, 推噓總分: +1

作者: jim510032000 - 發表於 2016/08/16 19:53(7年前)

1^F推ntust661: 才能展開啊08/16 23:09

[理工] 複變線積分問題

[ Grad-ProbAsk ]4 留言, 推噓總分: +2

作者: Ranen - 發表於 2016/08/05 13:10(7年前)

1^F推ntust661: 找出x y關係式08/05 13:28

2^F→ntust661: y = f(x)08/05 13:29

[理工] 流體力學

[ Grad-ProbAsk ]1 留言, 推噓總分: +1

作者: Yangdacom - 發表於 2016/07/26 14:50(7年前)

1^F推ntust661: 你是不是看錯答案07/29 22:36

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