Search
 
 

FLUID MECHANICS - CASE STUDY

    Introduction


Wind Tunnel Experiment

  A wind-tunnel experiment is conducted to study the effect of wind on tall buildings. In order to obtain the volumetric flow rate through the test section of the wind tunnel, engineers are first asked to determine the pressure drop between points A and B using a differential U-tube manometer. The fluid in the wind tunnel has a density of 1000 kg/m3 while the density of the gage fluid is 1600-kg/m3. Column heights are given as h1 = 1.25 m and h2 = 0.75 m.

     


U-Tube Differential Manometer


  Question

 

First derive an equation for the pressure drop (pA - pB). Then, calculate the value of (pA - pB) for the given values of fluid densities and column heights.

  Approach

  Although the fluid in the wind tunnel is flowing, the fluid in the manometer remains stationary. Hence, hydrostatic pressure analysis is still valid to determine the pressure drop.