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Proceeding from JBPTPPOLBAN / 2014-04-07 14:13:25
Oleh : Andriyanto Setyawan; Anam Bahrul; Indarto; Deendarlianto; Apip Badarudin; A.P. Edi Sukamto (andriyanto@polban.ac.id; edisukamto_ap@polban.ac.id)
Dibuat : 2014-04-07, dengan 1 file

Keyword : Annular flow, liquid holdup, wave velocity, wave number, CECM

Annular flow is one of the important flow regimes commonly found in process, power plant, geothermal, nuclear, air conditioning, and other industries employing two-phase flow. It is characterized by liquid film flowing on the wall and a gas core containing liquid droplets. Liquid holdup and disturbance wave are key parameters in such flow. Therefore, it is useful to observe its behavior for analyzing other parameters in horizontal annular flow. The liquid holdup and wave parameters of horizontal air-water annular flow in 26 and 16-mm-diameter pipe were determined using two flush-mounted CECM sensors, spaced 215 mm apart. The air and water superficial velocities were varied from 12 to 40 m/s and 0.05 to 0.2 m/s, respectively, and its effects were observed. The common phenomena of annular flow such as the disturbance wave, ripple wave, wave velocity, wave number, wave coalescence, and wave deformation could be observed. The mean liquid holdup was in the range of 0.04 to 0.15, indicating the gas dominant flow. It is also found that wave velocity increase as the air and water superficial velocity increase. Similar to those of wave velocity, the wave number also increases when the air and water superficial velocity increase.

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