Sand particles (SG = 2.7), approximately spherical withdiameters from 100 to 250 μm, are introduced into anupward-flowing stream of water at 20°C. What is theminimum water velocity that will carry all the sand particlesupward?

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(1) Experiments show that in a slightly Viscorur flund at on a молод high speeds the drag force fo exerted on body depends on several parametes. An engineer assumes that the drag force fo is a functon of the budy width normal to the upstream Velocity, I upstream Velouty, ✓, the upstream flud veElucay P viscosity, M, speed of sound, I and the airfoils surface roughnars. " use the Buckingham ♬ Theorem to determine the functional dependence of to on non-dimensional flow similarity parameters (2:) Lot the transition to turbulence occur when I = 1.01m, V= 1·01m/s and M₁P = 1:01·10⁰5 m² s. Calculate the transchen Reynolds number, Retrains.

An isothermal long cylinder with square (side of 0.4 m and diagonal of 0.5657 m) cross-section is placed in a flow with a velocity of 1 m/s as shown. The properties of the fluid are: kinematic viscosity is 1.38 x 10-5 m²/s, thermal conductivity is 0.024 W/m.°C, and Prandtl number is 0.73. What is the average Nusselt number for the flow? 1253 a Figure 1: Flow configuration for Problem 6. The dimensions are: a=0.4 m, b=0.5657 m