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Engineering · Mechanical Engineering
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11.8. Void, quality and pressure drop problem (Sections 11.4 and 11.5) Consider an adiabatic water channel 3 m long and 1 cm in diameter operating in homogeneous flow at 7.4 MPa pressure with a void (steam) distribution as shown in Figure 11.31. The total flow rate is 0.3 kg/s. Take the liquid viscosity at the operating conditions as 8.7 x 103 kg/m s

TABLE 118 Fluid Properties for Problem 11 Pr 731,76 kg/m3 P2 39.18 kg/m .7 89.63 HuPas σ 0.0166 N/m A. Find the values of {α}, {B) and x for the channel, that is, volume averaged values. B. Which values of Part A would change if the local flow velocities of the two phases remain equal but the flow rate was reduced by a fac tor of 2 but the flow regime was unchanged? C. Compute the pressure loss within the 3 m length. Answers: A. (r} = {p) = 0.041 x B. None C. APotal 63.3 kPa 0.0023

0.25 cm Typical pattern repeated through the tube. All bubbles identical diameter. 3 m 1 cm FIGURE 11.31 Void distribution.

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