Ultrasonic Characterization of Slurries in an Autoclave Reactor at Elevated Temperature

Soong, Yee; Gamwo, Isaac K.; Blackwell, A.G.; Harke, F.W.; Schehl, R.R.; Zarochak, M.F.

doi:10.1021/ie950771p

Cited by 11 publications

(10 citation statements)

References 9 publications

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“…(6) into Eq. (5), the amplitude ratio is found to be dependent on the gas holdup only and is expressed as (7) or (8) In addition, Waristo [19] proposed a similar result as follows:…”

Section: The Principle Of the Ultrasonic Methods For Gas Holdup Measurmentioning

confidence: 93%

“…In the actual measurement, the pulsed ultrasound method is typically used to extract the useful information of the fluid such that it avoids the interference of standing waves in continuous ultrasound measurement [7]. The dispersed phase concentration plays an important role in the amplitude of the transmission ultrasound [8], and the ultrasonic attenuation changed with regularity when the gas flow rate increased [9]. Rahiman et al introduced a mathematical model to explain the influence of a single gas bubble on ultrasound propagation, concluding that the ultrasonic attenuation increased with increases in the bubble diameter [10].…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic method for measuring the gas holdup of gas-liquid bubbly flow in a small-diameter pipe

Gong

Zhao

Zhai

et al. 2016

Korean J. Chem. Eng.

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Based on ultrasonic sound pressure attenuation, the ultrasonic pulse transmission method is proposed for measuring gas holdup in gas-liquid two-phase bubbly flows. Two ultrasonic transducers are positioned on opposite sides of a vertical upward pipe with an inner diameter of 20 mm. To obtain the relationship between ultrasonic attenuation and gas holdup, the mean value of the first pulse sequence of ultrasonic signals is first extracted as the measured signal. We used the quick closing valve method to obtain the gas holdup as the set value. Second, the relationship between the gas holdup and measured ultrasonic signals was established. The experiment result shows that the ultrasonic attenuation rate is significantly different at low and high gas holdups, as indicated by the bubble size images with a high-speed camera. We also investigated the ultrasonic field distribution using numerical simulation. The bubble size has an important effect on the ultrasonic attenuation coefficient, which provides a further physical explanation and reference for the experimental phenomena.

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“…(6) into Eq. (5), the amplitude ratio is found to be dependent on the gas holdup only and is expressed as (7) or (8) In addition, Waristo [19] proposed a similar result as follows:…”

Section: The Principle Of the Ultrasonic Methods For Gas Holdup Measurmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Ultrasonic method for measuring the gas holdup of gas-liquid bubbly flow in a small-diameter pipe

Gong

Zhao

Zhai

et al. 2016

Korean J. Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…Recent studies have shown that ultrasound can be used to characterize complex slurries, such as those at Hanford (Clark and Martin 1994). Other groups have used ultrasound to monitor slurries at elevated temperatures (Soong et al 1996) and ultrasonic piezoelectric transducers are now available that can operate at temperatures as high as 950ºC (Patel et al 1990).…”

Section: Discussionmentioning

confidence: 99%

Laboratory Directed Research and Development Annual Report - Fiscal Year 2000

Fisher¹,

Hughes²,

Pearson³

2001

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I am pleased to present the FY 2000 Annual Report on Laboratory Directed Research and Development (LDRD) at the Pacific Northwest National Laboratory. From our LDRD program springs a renewed vitality of science and technology, a test bed for promising research, and most importantly, a strengthened ability to address complex problems of national importance.The LDRD program provides an opportunity for our staff to conduct experimental research on advanced scientific areas that have the potential for important new discoveries and innovative solutions to difficult technical problems. These projects span a broad range of topics-from subsurface microbes to atmospheric processes, and from nanoscale atom clusters to geologic oil reserves.Perhaps one of the most exciting LDRD projects described in this year's report is one in the life sciences where we have extended previous work in genomics into the new frontier area of proteomics. Using mass spectrometry to catalogue and characterize proteins on a large scale, we can now rapidly identify proteins that are made in response to a change in the cellular environment. Many of these proteins have never been described. This advance in fundamental biology could greatly improve our understanding of how cells respond to toxic insults and could lead to new techniques for bioremediation and environmental cleanup as well as early diagnosis and treatment of diseases.As we head into the next century, we will be relying on the LDRD program to form the foundation for a new generation of products and processes that will benefit the U.S. Department of Energy, the nation, and the taxpayers. For example, LDRD-funded research on fuel cells promises to yield important new advances in powering energy-efficient, low-polluting automobiles and trucks. The increasing importance of computer information and network security also is being addressed through LDRD research, where we are developing technologies that could prevent destructive intrusions on national energy, transportation, and communication centers.Keeping us at the cutting edge of science and technology, the LDRD program fosters an innovative work environment that helps us recruit and retain the best and brightest staff. Here, our scientists and engineers are encouraged to turn their discoveries into practical solutions.The LDRD program has proven essential to the outstanding record of achievement at Pacific Northwest National Laboratory, and we expect it to remain a cornerstone of our success in the 21 st century.

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“…Both the amplitude ratio and the travel time were affected by the solids concentration. Soong et al (1996) performed similar measurements in three phase slurries of molten paraffin wax, nitrogen bubbles, and glass beads. In this study, the bubble size was also about 5 mm.…”

Section: Measurement Techniques In Liquid-liquid Dispersion Andmentioning

confidence: 97%

Acoustic Probe for Solid-Gas-Liquid Suspension

Tavlarides¹,

Sangani²

2003

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Ultrasonic Characterization of Slurries in an Autoclave Reactor at Elevated Temperature

Cited by 11 publications

References 9 publications

Ultrasonic method for measuring the gas holdup of gas-liquid bubbly flow in a small-diameter pipe

Ultrasonic method for measuring the gas holdup of gas-liquid bubbly flow in a small-diameter pipe

Laboratory Directed Research and Development Annual Report - Fiscal Year 2000

Acoustic Probe for Solid-Gas-Liquid Suspension

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