An oil with p=900 kg/m and v0.0002 m'/s flows upward through an inclined pipe as shown in Fig. E6.4. The pressure and elevation are known at sections 1 and 2, 10 m apart. Assuming %3D d=6 cm 10 m P2 = 250,000 Pa 17 40 = 350,000 Pa, z, = 0 steady laminar flow, (a) verify that the flow is up, (b) compute h, between I and 2, and compute (c) Q. (d) V, and (e) Re Is the flow really laminar? Tpgd'hy 128L %3D 2,431,G0 6610 &

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Q: P1 =346 kPa D; =0.12 m P2 107 kPa D2 43 m

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Q: uid mechan

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Field applications of hydraulic conductivity

Hydraulic conductivity is one of the hydraulic properties of soil defined as a measurement of the ability of a porous medium to permit water movement or fluid flow through it. It is denoted by the letter K. It is influenced by the density and viscosity of the fluid. It is also called permeability. Hydraulic conductivity is defined as the ratio of velocity to the hydraulic gradient. The different methods used to determine the hydraulic conductivity are laboratory methods (constant head permeability tests and falling head tests), in-situ field methods (pumping in and pumping out tests), small scale field tests (infiltration tests and slug tests), and indirect methods such as estimation from grain size, consolidation test data, and horizontal capillary test. The pedotransfer function (PTF) method is a specific empirical estimating approach employed in the soil sciences is also used to determine the hydraulic conductivity of the soil.