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      Empirical Formula of thr flow of Water, Steam, Gas

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◎ Hazen and Williams Equation (Only water flow)

   

Q = 0.000599 d^2.63 c ((p1 - p2)/L)^0.54

   

  Q : flow rate [l/min]

  d : internal diameter [mm]

  c : constant

      140 - new steel pipe

      130 - new cast iron pipe

      110 - riveted pipe

 p1 : inlet pressure [bar_g]

 p2 : outlet pressure [bar_g]

  L : length [m]

   

   

◎ Babcock Equation (Only steam flow)

   

△p = 6.76 ((d + 91.45)/d^6) W^2 L V

   

△p : pressure [bar_g]

  d : internal diameter [mm]

  W : flow rate [kg/hr]

  L : length [m]

  V : specific volume [m3/kg]

   

   

◎ Spitzglass 식 (Low pressure gas; 7kPa 이하)

   

q = 0.00338 √((△hw d^5)/(Sg L (1+ 91.5/d + 0.00118*d)))

   

  q : flow rate [m3/hr] (@ 15℃, 1.013 bar_a)

 hw : static pressure head [mm H2O]

  d : internal diameter [mm]

 Sg : specific gravity of gas [ ]

  L : length [m]

   

   

◎ Weymouth 식 (High pressure gas)

   

q = 0.00261 d^2.667 √[((p1^2-p2^2) / (Sg Lm)) * (288/T)]

   

  q : flow rate [m3/hr] (@ 15℃, 1.013 bar_a)

  d : internal diameter [mm]

 p1 : inlet pressure [bar_a]

 p2 : outlet pressure [bar_a]

 Sg : specific gravity of gas [ ]

 Lm : length [km]

  T : absolute temperature [K]

[이 게시물은 운영자님에 의해 2008-03-22 00:48:37 유체역학에서 이동 됨

   

원본 위치 <http://www.chemeng.co.kr/site/bbs/board.php?bo_table=xstudy2&wr_id=61&page=3>

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