ES 202 Fluid and Thermal Systems Tutorial for Week Ten 2 20 03 1 Page 1 Conceptual problems on pressure variation in pipe flows to atmosphere to atmosphere a a b Which figure depicts the correct physics Explain your choice b Given the liquid column height from the liquid surface is H what is the flow velocity in the larger section of the contoured passage 2 Select the correct answer and explain your choice a h1 h2 b h1 h2 c h1 h2 h1 honeycomb h2 ES 202 Fluid and Thermal Systems Tutorial for Week Ten 2 20 03 3 Page A plate of negligible weight closes a 10 cm diameter hole in a tank containing air and water as shown below A 100 kg block of concrete is suspended from the plate and is completely immersed in the water As the air pressure is increased the differential reading h on the inclined tube mercury manometer increases Determine h just before the plate starts to lift off the hole air h mercury 30 deg water 4 Hydrostatic forces and moments on sloped surfaces Consider the figure below a rigid body OAB is placed under water in a lake Compute a the hydrostatic pressure force acting on the rigid body b the total moment due to hydrostatic forces about Point O H L1 O 1 A L2 2 bottom of lake B 2 ES 202 Fluid and Thermal Systems Tutorial for Week Ten 2 20 03 5 Page Conceptual questions on external flows a Consider the following experimental setup which object will reach the bottom of the liquid column first Explain your choice tear drop object steel ball thick viscous liquid b Consider the following experimental setup describe the motion of the balance arm as the flow speed of the jets increases from zero to high speeds and explain your answers rough ball 6 Circle the correct answers A For the same free stream speed the local skin friction will be a higher b the same c lower if the local boundary layer thickness is thinner B At the same location on a flat plate the boundary layer will be a thinner b the same c thicker if the free stream speed is halved smooth ball 3
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