Nitrogen flows through a 4 in. x 6 in. rectangular duct at a rate of 2280 ft/s. What is the Reynolds Number?

Which of the following statement is TRUE? (A) Friction factor f in laminar flow depends on the Reynolds number and the surface roughness of the pipe (B Both Circular and non-circular pipes can withstand large pressure differences between the inside and the outside without undergoing any significant distortion. The pressure drop in a pipeline changes by a factor of 2 when the velocity of the flowing fluid is doubled (D) In a steady flow/ streamline flow, the rate of mass entering the flow system equals that leaving, as mass can neither accumulated nor depleted within a flow system under steady conditions (E) Reynolds experiment concluded that at streamline flow, thevelocity moved from a minimum at the tube center to a maximum atthe wall whereas the fluid itself moved in shells or lamina.

A device for measuring the specific weight of a liquid consists of a U-tube manometer as shown. The manometer tube has an internal diameter of 0.5 cm and originally has water in it. Exactly 4 cm3 of unknown liquid is then poured into one leg of the manometer, and a displacement of 5 cm is measured between the surfaces as shown. What is the specific weight of the unknown liquid?

Consider the laminar flow of water in a 0.1-in diameter tube at a temperature of 60°F. The velocity profile is parabolic; refer to Example 2 on pages 36-37 in Chapter 2. If the average velocity is 2 ft/s, determine the magnitude of the shear stress at the tube wall.