Fluid Flow BERNOULLI’S EQUATION Now we can use the Extended Bernoulli equation to determine the required pump head. z₁ v² 1 2g P_1n1 g_c g H_p z₂ v² 2 2g P_2n2 g_c g H_f H_p (z₂ z₁) æ ç ç è ö ÷ ÷ ø v² 2 v² 1 2g (P₂ P₁)  n g_c g H_f 65  ft æ ç è ö ÷ ø 0.178 ft sec 2 æ ç è ö ÷ ø 0 ft sec 2 2^æ ç è ö ÷ ø 32.17 ft  lbm lbf  sec² 0  ft 2  ft H_p 67  ft The  student  should  note  that  the  solution  of  this  example  problem  has  a  numerical  value  that "makes  sense"  from  the  data  given  in  the  problem.    The  total  head  increase  of  67  ft.  is  due primarily to the 65 ft. evaluation increase and the 2 ft. of friction head. Application of Bernoulli’s Equation to a Venturi Many plant components, such as a venturi, may be analyzed using Bernoulli’s equation and the continuity equation.   A venturi is a flow measuring device that consists of a gradual contraction followed by a gradual expansion.  An example of a venturi is shown in Figure 6.  By measuring the differential pressure between the inlet of the venturi (point 1) and the throat of the venturi (point 2), the flow velocity and mass flow rate can be determined based on Bernoulli’s equation. Figure 6    Venturi Meter Rev. 0 Page 27 HT-03