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Title: Air emission into a water shear layer through porous media. Part 1: Scaling of bubble creation noise

Abstract

In many industrial processes, including aeration systems and reduction of cavitation induced vibration and erosion in hydroturbine casings, it is advantageous to be able to create gas bubbles with specific size distributions, higher uniform or widely distributed in diameter, depending on the situation. The induced noise and vibration associated with such systems is of increasing concern due to hearing protection standards and structural fatigue of the casing and piping. A convenient way to generate a two-phase distribution within a water pipe is to span the pipe with a streamlined surface such as a two dimensional hydrofoil and emit air through a porous medium into the shear flow over the hydrofoil. Such a hydrofoil was built and mounted in the ARL Penn state 30.5 cm diameter water tunnel. Air was introduced into a plenum within the hydrofoil which provided air evenly to the entire surface of the centered stainless steel cover plates (20 and 100 micron porosities). Air bubbles formed at the surfaces of the cover plates through the breakdown of small jets of air issuing from the pores. The effects of the air jet size and momentum on the formation noise for a given set of conditions were evaluated bymore » using the two different porosities of sintered metal and through the use of an array of 20, 1.2 mm diameter orifices. A variation in the shear layer was achieved by discharge through plates mounted on either the pressure or suction side of the foil. The noise due to bubble creation and transport through the highly turbulent foil wake was measured by a 2.5 cm diameter hydrophone mounted on the water tunnel window.« less

Authors:
;  [1]
  1. Pennsylvania State Univ., State College, PA (United States). Applied Research Lab.
Publication Date:
OSTI Identifier:
100924
Report Number(s):
CONF-940659-
ISBN 0-7918-1373-8; TRN: IM9540%%398
Resource Type:
Book
Resource Relation:
Conference: 1994 American Society of Mechanical Engineers (ASME) Fluids Engineering Division summer meeting, Lake Tahoe, NV (United States), 19-23 Jun 1994; Other Information: PBD: 1994; Related Information: Is Part Of Cavitation and gas-liquid flow in fluid machinery and devices. FED-Volume 190; O`Hern, T.J.; Kim, J.H.; Morgan, W.B.; Furuya, O. [eds.]; PB: 350 p.
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; HYDRAULIC TURBINES; MECHANICAL VIBRATIONS; NOISE; CAVITATION; WATER; AERATION; EROSION; BUBBLE GROWTH; TWO-PHASE FLOW; SHEAR; TURBINE BLADES; TEST FACILITIES; EXPERIMENTAL DATA; NOISE POLLUTION; RESEARCH PROGRAMS

Citation Formats

Myer, E C, and Marboe, R C. Air emission into a water shear layer through porous media. Part 1: Scaling of bubble creation noise. United States: N. p., 1994. Web.
Myer, E C, & Marboe, R C. Air emission into a water shear layer through porous media. Part 1: Scaling of bubble creation noise. United States.
Myer, E C, and Marboe, R C. 1994. "Air emission into a water shear layer through porous media. Part 1: Scaling of bubble creation noise". United States.
@article{osti_100924,
title = {Air emission into a water shear layer through porous media. Part 1: Scaling of bubble creation noise},
author = {Myer, E C and Marboe, R C},
abstractNote = {In many industrial processes, including aeration systems and reduction of cavitation induced vibration and erosion in hydroturbine casings, it is advantageous to be able to create gas bubbles with specific size distributions, higher uniform or widely distributed in diameter, depending on the situation. The induced noise and vibration associated with such systems is of increasing concern due to hearing protection standards and structural fatigue of the casing and piping. A convenient way to generate a two-phase distribution within a water pipe is to span the pipe with a streamlined surface such as a two dimensional hydrofoil and emit air through a porous medium into the shear flow over the hydrofoil. Such a hydrofoil was built and mounted in the ARL Penn state 30.5 cm diameter water tunnel. Air was introduced into a plenum within the hydrofoil which provided air evenly to the entire surface of the centered stainless steel cover plates (20 and 100 micron porosities). Air bubbles formed at the surfaces of the cover plates through the breakdown of small jets of air issuing from the pores. The effects of the air jet size and momentum on the formation noise for a given set of conditions were evaluated by using the two different porosities of sintered metal and through the use of an array of 20, 1.2 mm diameter orifices. A variation in the shear layer was achieved by discharge through plates mounted on either the pressure or suction side of the foil. The noise due to bubble creation and transport through the highly turbulent foil wake was measured by a 2.5 cm diameter hydrophone mounted on the water tunnel window.},
doi = {},
url = {https://www.osti.gov/biblio/100924}, 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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