| Abstract: | Water hammer phenomena caused by a rapid valve closure in a one-component two-phase bubbly flow were investigated experimentally. The experiments were conducted in a horizontal tube of 21.4 mm in inner diameter and 16.17 m long in ranges of superficial liquid velocity jl from 0.5 to 1.5 m/s and of pressure from 0.25 to 1.5 MPa, using a refrigerant (R113), ethanol and water as the working fluid. The profiles of transient pressure, value of potential surge, and propagation velocity of the compression waves were obtained and discussed, comparing them with those in an air-water two-component two-phase flow. In particular, the pressure transient in a one-component two-phase flow is characterized by the existence of an exponential pressure decay just after the initial pressure rise. This phenomenon is closely related to the interface mass transfer. |
