Continuous Wavelet Transforms of Instantaneous Wall Pressure in Slug and Churn Upward Gas-Liquid Flow  

Oleh:

Beasley, Donald E. ; Holloway, Mary V. ; McClusky, Heather L. ; Ochterbeck, Jay M.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Fluids Engineering vol. 124 no. 3 (2002), page 625-633.
Topik: LIQUIDS; wavelet transforms; wall pressure; slug; churn; gas - liquid flow

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ89.3 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

Lihat Detail Induk

Isi artikel

Continuous wavelet transforms are employed to determine the time - localized frequency content (scalogram) of instantaneous wall pressure signals in upward gas - liquid flow. The flow conditions correspond to well - defined slug flow, well - defined churn flow, and flows near the transition from slug - to - churn flow. Scalograms demonstrate that the frequency content of the pressure signals is time - dependent, and visual observations of the flow conditions suggest that the time - dependent frequencies are related to identifiable physical behaviors of the flow. In well - defined slug flow, the scalograms are characterized by the presence of a dominant frequency throughout the duration of the signal and by frequency shifting events. Scalograms representing well - defined churn flow contain intermittent frequencies, and the energy density in churn flow is spread over a wider range of frequencies than in slug flow. The present results provide evidence that flows near transition alternately display characteristics of both well - defined slug and well - defined churn flows.

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