Fluid Mechanics Lab

When a viscous fluid flows past a thin sharp-edged plate, a thin sharp-edged plate, a thin layer adjacent to the plate surface develops in which the velocity, u, changed rapidly from zero to the approach velocity, U, in a small distance, δ. This layer is called a boundary layer. The thickness of this layer increases with the distance x along the plate as shown in figure 3. Assume that u = U y/ δ; and δ = 3.5 √ ϑ x/U , where ϑ is kinetic viscosity of the fluid. Determine an expression for the force (drag) that would be developed on one side of the plate of length l and width b. Express your answer in terms of l, b, ϑ, and ρ, where ρ is the fluid density. Tài liệu giúp bạn tham khảo, ôn tập và đạt kết quả cao. Mời bạn đón xem.  

Ten cubic feet of air at 1000F and 50 lb/in.2 absolute are compressed isothermally to 2 cubic feet. What is the pressure when the air is reduced to this volume? What is the modulas of elasticity at the beginning and end of the compression? A space of 2-in. width between two large plane surfaces is filled with oil at 60,50 F. What force is required to drag a very thin plate of 5 ft2 area between the surfaces at speed of 0,5 ft/sec if this plate remains equidistant from the two surfaces? If it is distance of 0,5 in from one of the surfaces? Tài liệu giúp bạn tham khảo, ôn tập và đạt kết quả cao. Mời bạn đón xem.  

(1) Start the pump of the hydraulic bench and adjust the flow so the level in the tank stays just above the overflow pipe in the tank. (2) Allow conditions to stabilize and use the hydraulic bench to measure the flow. Record the Head inside the tank. (3) Reduce the inlet flow (supply from the hydraulic bench) so that the head falls by about 30 mm. (4) Allow conditions to stabilize and use the hydraulic bench to measure the flow. Record the Head inside the tank. Tài liệu giúp bạn tham khảo, ôn tập và đạt kết quả cao. Mời bạn đón xem.