Development of an Acoustic Instrument for Bubble Size Distribution Measurement in Mercury

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$150,000.00
Award Year:
2012
Program:
SBIR
Phase:
Phase I
Contract:
DE-FG02-12ER90280
Award Id:
n/a
Agency Tracking Number:
98778
Solicitation Year:
2012
Solicitation Topic Code:
09 c
Solicitation Number:
DE-FOA-0000577
Small Business Information
10621-J Iron Bridge Road, Jessup, MD, 20794-9381
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
605227875
Principal Investigator:
Xiongjun Wu
Dr.
(301) 604-3688
wxj@Dynaflow-inc.com
Business Contact:
Georges Chahine
Dr.
(301) 604-3688
glchahine@dynaflow-inc.com
Research Institution:
Stub




Abstract
Intense pulsed pressure waves induced by proton beam impact on mercury in a spallation target propagate in the mercury and reflect from vessel walls as expansion waves resulting in cavitation damage to the walls. Injection of gas bubbles (few micrometer diameter range and void fraction of the order of 1%) into the mercury flow is one of the promising methods under investigation to mitigate the damage. Due to the opacity of mercury, a non-optical diagnostic tool is needed to quantify the injected bubble populations. The fact that bubbles have strong effects on acoustic wave propagation makes acoustic methods very good candidates for this application. This project will develop an acoustic diagnostic tool that can meet all the bubble sizing requirements for Spallation Neutron Source (SNS) applications. It will build on the technology of the present state-of-the-art acoustic bubble sizing instrument, the ABS ACOUSTIC BUBBLE SPECTROMETER, which works well for void fractions of the order of 0.1% and for bubbles between 20 and 500 m in diameter. The new instrument will use a nonlinear bubble dynamics model that extends the current linear theory utilized in the present ABS system to fully account for large bubble oscillations, bubble interactions, and strong acoustic damping. It will also use artificial intelligence (neural networks) to help solve the acoustic inverse problem and improve measurement accuracy and speed. Additionally, the proposed new method will investigate a wave reflection scheme which has the potential to outperform the wave transmission scheme currently used in ABS systems in high void fraction conditions. An acoustic instrument that is capable of measuring a wide range of bubble sizes at high void fraction will be a valuable tool for diagnostic and control of numerous multi-phase flow and liquid metal applications. Successful development of the proposed instrument will have wide commercial and scientific applications and benefits. In addition to the SNS application, the instrument will find application in oceanographic, biological, chemical, pharmaceutical, and other industrial fields.

* information listed above is at the time of submission.

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