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  1. #1

    Dec 2008
    Thessaloniki, , Greece.
    :
    251

    -



    , posts . :

    ( ) V = Q/A. . :

    P1 = 1 + Patm bar (P2 = Patm). , Bernoulli :

    P1 + 1/2V1^2 + gh1 = P2 + 1/2V2^2 + gh2
    P = 1 + Patm Patm = 1 bar
    V1 = 0
    h1 = h2
    :
    V2 = sqrt(2P/)

    :
    1. V2 V ? , P = 1 bar 18 mm V = 14.14 m/s. ( 2 m/s ).
    2. ? ? ?
    3. ?



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    <hr noshade size=\"1\"><font size=\"1\">http://www.myengineeringworld.net</font id=\"size1\">

  2. #2

    Jun 2008
    Glyfada, , Greece.
    :
    3,101
    :
    Bernoulli . , , V2=0. . ' :
    Bernoulli ! , ( ). Bernoulli losses.
    :
    V . V1=V2=V. h1=h2 :
    P1 + 1/2V1^2 + gh1 = P2 + 1/2V2^2 + gh2 + (losses)

    (losses) = line + local
    =1 . = V/2. (V = sqrt(2P/)) V. ; ( ) . !
    ! ;

    !




  3. #3

    Dec 2008
    Thessaloniki, , Greece.
    :
    251
    . . . :

    ( ) 1 bar . 18 mm. ( L). . :

    ) Bernoulli () V = 14.4 m/s.

    B) Bernoulli ( ) :
    P1 + 1/2V1^2 + gh1 = P2 + 1/2V2^2 + gh2 + hlosses
    1:
    2:
    :
    P = 1 bar
    V1 = 0
    hlosses = h + h

    Reynolds.
    Re = VxD/v
    : V ?
    V?
    ?

    . max 2 3 m/s : (<2 m/s). ? ?

    : ( ) / . . Am I missing something?

    : "" / ( /)?

    off topic:
    1) .
    2) ̒ ( ). .



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  4. #4
    quote:Originally posted by The Mechanix
    off topic:
    1) .
    2) ̒ ( ). .
    .. , .

    , 150% ..
    -- .

    quote: ( ) 1 bar . 18 mm. ( L). . :

    ) Bernoulli () V = 14.4 m/s.

    B) Bernoulli ( ) :
    P1 + 1/2V1^2 + gh1 = P2 + 1/2V2^2 + gh2 + hlosses
    1:
    2:
    :
    P = 1 bar
    V1 = 0
    hlosses = h + h

    Reynolds.
    Re = VxD/v
    : V ?
    V?
    ?
    V , D..
    : , .. [u] 18 .
    , . , , .

    Re ?
    , .. (/D), .

    .

    , , . , , .

    V1 ? . V1=V2=V.

    quote: . max 2 3 m/s : (<2 m/s). ? ?
    182.

    14.

    2m/s : 2*3600*(3,14*0,014^2)/4=1,1m^3/h

    1100 / . 18 /, .
    , , ?
    quote: : ( ) / . . Am I missing something?
    . .
    quote: : "" / ( /)?
    1,5 .
    . 10 .

    (3600/10 )*1,5 = /.

    (60/10 )*1,5 = /.

    . .

  5. #5
    Super Moderator DDD's Avatar
    Jul 2007
    Athens, , Greece.
    :
    1,695
    quote:Originally posted by The Mechanix


    B) Bernoulli ( ) :
    P1 + 1/2V1^2 + gh1 = P2 + 1/2V2^2 + gh2 + hlosses
    1:
    2:
    :
    P = 1 bar
    V1 = 0
    hlosses = h + h

    Reynolds.
    Re = VxD/v
    : V ?
    V?
    ?
    . , , . .

  6. #6

    Jun 2008
    Glyfada, , Greece.
    :
    3,101
    ݻ off-topic ( ) topic . ( ) :
    quote:
    1) .
    2) ̒ ( ). .
    1. :
    .
    : : ( ) / . .
    , !
    . Bernoulli . . (your pipeline) - . dt ! , 1000 ! :
    ; . !
    :
    :
    ( ). :
    1. 18 --> 1800 l/h
    2. 22 --> 2400 l/h
    3. 28 --> 2800 l/h
    4. 32 --> 3000 l/h

    ( ) , , :
    , ! !! !

    :
    , ! . . ' . (, ) 50 60 70, . ! ( ) . ! , ! : !
    . , .
    ( ) expert! :

    1.
    50 282 , 5 (=2) STA 1" 4 . 1 Bar .

    2.
    . STA 4 1. ; ;

    ! , ...

    ..
    engineering.
    , , , . 0 ! . 1 . to Atm. 1 Bar :
    1 Bar = 10 mWS = 100 kPa = 1000 mBar hPa(hecta-Pascal. hecta = 100) = 10.000 mmWS = 100.000 Pa.
    .
    Torr mmHg ( 1 Bar = ~760 Torr). Torr . 13 13 Hg 130 Torr 17,1 kPa 1,7 . -



  7. #7
    ( .
    mechanic .

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    http://udravlikos.gr

  8. #8

    Jun 2008
    Glyfada, , Greece.
    :
    3,101
    , ![8D]


  9. #9

  10. #10

    Jun 2008
    Glyfada, , Greece.
    :
    3,101


    ! 5%. :
    3080 l/h ( +0,6%) & 2388 l/h ( +12%). ( Trial and error) ps. : 1,01 Bar & 0,79 Bar . 5000 28. ' . 2000 l/h.
    Mechanix p=1,000000 Bar. .

    , 4 50 ---- !



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