Ch 4. Fundamental Laws (Integral Anal.) fl Multimedia Engineering Fluids ConservationMass LinearMomentum Moment ofMomentum ConservationEnergy
 Chapter 1. Basics 2. Fluid Statics 3. Kinematics 4. Laws (Integral) 5. Laws (Diff.) 6. Modeling/Similitude 7. Inviscid 8. Viscous 9. External Flow 10. Open-Channel Appendix Basic Math Units Basic Equations Water/Air Tables Sections Search eBooks Dynamics Statics Mechanics Fluids Thermodynamics Math Author(s): Chean Chin Ngo Kurt Gramoll ©Kurt Gramoll

 FLUID MECHANICS - CASE STUDY Introduction Firefighting Drill Click to view movie (70k) 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.