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Title: A rotating two-phase gas/liquid flow for pressure reduction in underwater plasma arc welding

Abstract

Plasma arc welding processes are used in off-shore industry for the construction and maintenance in the wet surrounding of underwater structures and pipelines. In greater water depth the density of the plasma gas increase because of the greater hydrostatic pressure. This causes an increase of the conductive heat losses to the wet surrounding. To keep up the energy flux to the workpiece a pressure reduction is favorable against the surrounding. To keep up the energy flux to the workpiece a pressure reduction is favorable against the surrounding. The plasma arc has to burn in a locally dry area. This requirement can be fulfilled by a rotating disc placed above the workpiece. In the gap between the lower end of the cylinder and the workpiece a rotating two-phase flow is maintained. The flow around the rotating disc is experimentally investigated. The rotating disc is placed above the surface of the workpiece which is simulated by a flat plate. Water is forced out of the cylinder due to centrifugal forces set up by the rotating disc and flat plate. The velocity distribution in the flow is measured by Laser-Doppler-Anemometry. The phase distribution in the two-phase flow in the gap is measured bymore » local electrical probes. The static pressure in the gaseous atmosphere is reduced in comparison to the hydrostatic pressure of the surrounding water. The pressure reduction is given by the void fraction, the phase distribution and the volume flow rates of both phases in the gap as well as by the speed of revolution and the design of the disc and the work surface. Apart from the investigations on the fluid dynamics, the method to reduce the pressure was technically proved. Experiments were carried out under water with a plasma MIG welder.« less

Authors:
; ; ;  [1]
  1. Univ. of Hanover (Germany)
Publication Date:
OSTI Identifier:
100897
Report Number(s):
CONF-941142-
ISBN 0-7918-1419-X; TRN: IM9540%%371
Resource Type:
Book
Resource Relation:
Conference: American Society of Mechanical Engineers` winter annual meeting, Chicago, IL (United States), 6-11 Nov 1994; Other Information: PBD: 1994; Related Information: Is Part Of Multiphase flow and heat transfer in materials processing. FED-Volume 201; HTD-Volume 297; Chen, M.M.; Crowe, C.T. [eds.]; PB: 66 p.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; WELDING MACHINES; DESIGN; PIPELINES; PLASMA ARC WELDING; STEELS; UNDERWATER FACILITIES; TWO-PHASE FLOW; OFFSHORE OPERATIONS; UNDERWATER OPERATIONS; EXPERIMENTAL DATA; PERFORMANCE; PRESSURE CONTROL

Citation Formats

Steinkamp, H, Creutz, M, Mewes, D, and Bartzsch, J. A rotating two-phase gas/liquid flow for pressure reduction in underwater plasma arc welding. United States: N. p., 1994. Web.
Steinkamp, H, Creutz, M, Mewes, D, & Bartzsch, J. A rotating two-phase gas/liquid flow for pressure reduction in underwater plasma arc welding. United States.
Steinkamp, H, Creutz, M, Mewes, D, and Bartzsch, J. 1994. "A rotating two-phase gas/liquid flow for pressure reduction in underwater plasma arc welding". United States.
@article{osti_100897,
title = {A rotating two-phase gas/liquid flow for pressure reduction in underwater plasma arc welding},
author = {Steinkamp, H and Creutz, M and Mewes, D and Bartzsch, J},
abstractNote = {Plasma arc welding processes are used in off-shore industry for the construction and maintenance in the wet surrounding of underwater structures and pipelines. In greater water depth the density of the plasma gas increase because of the greater hydrostatic pressure. This causes an increase of the conductive heat losses to the wet surrounding. To keep up the energy flux to the workpiece a pressure reduction is favorable against the surrounding. To keep up the energy flux to the workpiece a pressure reduction is favorable against the surrounding. The plasma arc has to burn in a locally dry area. This requirement can be fulfilled by a rotating disc placed above the workpiece. In the gap between the lower end of the cylinder and the workpiece a rotating two-phase flow is maintained. The flow around the rotating disc is experimentally investigated. The rotating disc is placed above the surface of the workpiece which is simulated by a flat plate. Water is forced out of the cylinder due to centrifugal forces set up by the rotating disc and flat plate. The velocity distribution in the flow is measured by Laser-Doppler-Anemometry. The phase distribution in the two-phase flow in the gap is measured by local electrical probes. The static pressure in the gaseous atmosphere is reduced in comparison to the hydrostatic pressure of the surrounding water. The pressure reduction is given by the void fraction, the phase distribution and the volume flow rates of both phases in the gap as well as by the speed of revolution and the design of the disc and the work surface. Apart from the investigations on the fluid dynamics, the method to reduce the pressure was technically proved. Experiments were carried out under water with a plasma MIG welder.},
doi = {},
url = {https://www.osti.gov/biblio/100897}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Dec 31 00:00:00 EST 1994},
month = {Sat Dec 31 00:00:00 EST 1994}
}

Book:
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