By Samuel Seely
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Extra info for An Introduction to Engineering Systems
1-14. Calculate the laminar resistance of 100 feet of TG I D tubing for air and water at 68 degF. 002. 1-15. Water flow through a triangular weir is given by the equation, Q = CPV2£tf. Find an expression for the effective resistance of the weir. 1-16. The flow versus differential head for a 1-in. orifice is given in the figure. 6 except for very low flow where the Reynolds number is small. a. Show that the resistance at any head is given by R = 2^hjlgjKA(sec/ft2). b. Determine R at the following values of h: 16, 20, 24.
Ventilating and other air-transport systems where changes of air density are small may be treated as incompressible flow systems. Generally, however, the pressure differentials are substan tial, and compressible flow considerations are necessary. The system elements for a gas system are illustrated in Fig. 1-42. To describe the features of these elements, the flow laws for both laminar and turbulent conditions must be used. For turbulent flow through pipes, orifices and valves, the steady-flow energy equation (the first law of thermodynamics) for adiabatic flow of ideal gases is, w = KAYV2g(Pl-p2)lp (kg/sec) where w = gas flow rate, kg/sec, A = area of restriction, Y = rational expansion factor = y = specific heat ratio for gases, p = gas density, kg/m3, K = a flow coefficient, p = pressure, kg/m2.
These are listed on pp. 509 to 511. Active Networks 51 To determine analytically the a-factors in these equations is a complicated problem in most cases, owing to the energy conversion principles that are involved in such devices. Moreover, the theoretical demands are beyond those expected of the present readers, and so this aspect of the transducer will not be pursued here. However, certain features of the transducer are possible from a study of Eqs. (1-79). Thus, it follows directly from Eqs.
An Introduction to Engineering Systems by Samuel Seely