hw_2 - J. Buongiorno / Spring 2007 22.313J, 2.59J, 10.536J...

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J. Buongiorno / Spring 2007 22.313J, 2.59J, 10.536J THERMAL-HYDRAULICS IN POWER TECHNOLOGY Homework Set 2 Annular and Bubbly Flow in the Riser of a High-Pressure Two-Phase Loop An engineer at the Electric Power Research Institute (EPRI) is studying the two-phase flow behavior of water at 6.4 MPa (properties in Table 1). His data will be used to improve the design of nuclear and conventional steam generators. The experimental apparatus is a natural circulation loop comprising an electric heater of variable power, a riser and a downcomer. The riser is a vertical pipe of hexagonal cross-section, 5.68-cm wide (flat-to-flat) and 6-m long. You are to analyze the characteristics of the two-phase flow in the riser, at two different power levels of the electric heater. Full Power At full power, the riser receives a two-phase mixture with 2.52 kg/s mass flow rate at 15% quality. i) Verify that the two-phase flow pattern in the riser is annular. ii)
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hw_2 - J. Buongiorno / Spring 2007 22.313J, 2.59J, 10.536J...

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