Search
 
 

FLUID MECHANICS - CASE STUDY

    Introduction


Firefighting Drill

 

In a firefighting drill, a trainee learns to operate a fire hose. How much force should the trainee apply to hold the hose in a steady position? A nozzle is attached to the end of the hose to increase the velocity of the water. The nozzle outlet has a diameter of 3 in and the hose diameter is 6 in. The gage pressure at section 1 is 0.75 psi, and the water flows at a rate of 0.5 slugs/s. The length of the pipe is 2 ft.

   
  Questions

  Find the required force to keep the hose in place.
     

Problem Description
  Approach

 
  • Choose an appropriate control volume, and label all forces and velocities.
  • Apply the linear momentum equation.
  • Neglect the weight of the hose, nozzle and water inside the nozzle.
  • The density of the water is 1.94 slugs/ft3.
     
   
 
Practice Homework and Test problems now available in the 'Eng Fluids' mobile app
Includes over 250 free problems with complete detailed solutions.
Available at the Google Play Store and Apple App Store.