QUIZ #2 PRACTICE

ME 303 FLUID DYNAMICS/ WESTPHAL/ WSU/ FALL 2000

The problems below are offered for your use in preparation for the quiz. It is suggested that you try to work them alone in one sitting, quickly, using your text and notes as you would for an in-class exam.

1. A saltwater intrusion barrier is a bottom-mounted obstruction intended to retard the movement of salty bottom water during tidal motion in a river estuary. Suppose a V₁=2 m/sec current flows in a h₁ = 4 m deep river with a barrier, producing a downstream flow that is h₂=3 m deep. Find the reaction force (per unit length) required to anchor the barrier to the riverbottom, including its direction.
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
2. A Pitot tube installed in a rectangular 50 cm by 80 cm air duct is connected to a U-tube water manometer which reads H = 30 mm of water. A second water-filled U-tube manometer, one side open to atmosphere, is installed in the duct as shown to give static pressure. This manometer reads h = 20 mm as shown, and the duct air temperature is measured to be 25 deg. C. Local atmospheric pressure is measured by a mercury barometer to be 760 mm of mercury.
   
   • What is the static pressure of the duct airflow?
   • What is the stagnation pressure of the duct airflow?
   • What is the dynamic pressure of the duct airflow?
   • What is the indicated air velocity within the duct?
   • Assuming uniform flow in the duct, what are the mass flowrate and volume flowrate of air?