It is essential to write legibly and show your works. If your work is absent or

Question

It is essential to write legibly and show your works. If your work is absent or illegible, and at the same time your answer is not perfectly correct, the n no partial credit can be awarded. Completely correct answers which are given without justification may receive little or no credit. Three pressure probes are inserted into a horizontal flow field as shown below. If P_1 - 120 kPa, p_2 = 30 kPa, find p_3. In a refinery oil (specific gravity s = 0.85, kinematic viscosity v = 1.8*10^-5 m^2/s) flows through a 100mm diameter pipe at 0.4L/s. Is the flow laminar or turbulent? A pipe is 4 cm diameter and narrows to a 10mm diameter. By how much the velocity of the water moving from the larger to the smaller side will be changed? Water flows through the 2-in-diameter pipe at 0.2 ft^3/s as shown in the figure. If the pressure at A is 30 psi, determine the pressure at C and D.

Explanation / Answer

ans 1. Since all points on the same horizontal level in a horizontal non-accelerated fluid flow are on the same pressure, hence p2 = p3 = 30 kpa.

ans 3. By the equation of continuity, we have

v1 a1 = v2 a2    => v1 (4cm)2 = v2 (1cm)2

      v2 = v1 / 16

ans 4. the vertical height difference (h) between A and C is h= 4sin(30) = 2 ft

   now use ... Pc = Pa + dwater g h

     

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