STUDY ON THE VIBRATIONAL CHARACTERISTICS OF A TUBE ARRAY CAUSED BY TWO-PHASE FLOW. PART II: FLUIDELASTIC VIBRATION

This paper presents experimental results on the fluidelastic vibration caused by air-water flow and by steam-water two-phase flow in conditions of up to 7.0 MPa pressure and temperatures reaching 284oC. A new criterion, based on an assumption of energy balance per cycle of oscillation, is introduced using the "true" flow velocity. However, comparison with the experimental data indicates that, in the slug or froth flow regimes, the speed of the intermittently rising slugs, introduced in Part I of this study, should be used; hence, a new modified criterion for the slug and froth flow regimes is derived. In addition, the new criterion is compared with the usual Connors-type criterion which greatly depends on the estimation of the damping in two-phase flow. The agreement between the two criteria is found to be within the uncertainty introduced by the variance in the unknown parameters in the Connors criterion.

• Supplemental Notes:
  • J Fluids and Structures, v 9 n 5, July 1995, p 539 [24 p, 13 ref, 3 tab, 20 fig]
• Authors:
  • Nakamura, T
  • FUJITA, K
• Publication Date: 1995

Language

• English

Subject/Index Terms

• TRT Terms: Flow; Multiphase flow; Phased arrays; Tubing; Vibration
• Old TRIS Terms: Arrays; Flow induced vibration
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00717297
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Mar 4 1996 12:00AM