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Abstract

Natalia Marek-Trzonkowska and Piotr Trzonkowski of the Medical University of Gdańsk talk about trust, coordination, and creative conflicts – in the first of a series of interviews with scientists who are partners both at work and in life.

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Authors and Affiliations

Natalia Marek-Trzonkowska
Piotr Trzonkowski
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Abstract

In order to clarify the action law of the swirl oxygen lance jet on the melt pool of the converter and to determine the optimal swirl angle of the swirl oxygen lance for the 120t converter, this study establishes the gas-liquid two-phase flow model of the oxygen lance with different swirl angles based on the realizable k-ε model and the VOF multiphase flow model. The gas-liquid interface behavior during the interaction between the jet and the molten pool was analyzed, and the flow pattern of molten steel in the molten pool was mainly investigated. The results show that compared with traditional oxygen lance, the rotating oxygen lance jet enhances the stirring of the melt pool and intensifies the fluctuation of the melt pool liquid level. The depth of the impact cavity decreases with the increase of the swirl angle, but the diameter of the impact cavity increases with the increase of the swirl angle. When the jet with a swirl angle of 10 ° impacts the surface of the melt pool, the turbulence energy obtained by the molten steel is the highest, the average flow velocity inside the melt pool is the highest, and the molten steel is stirred more thoroughly, achieving better melting effects.
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Bibliography

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[6] Li, M., Li, Q. & Kuang, S. (2016). Computational investigation of the splashing phenomenon induced by the impingement of multiple supersonic jets onto a molten slag–metal melt pool. Industrial & Engineering Chemistry Research. 55(12), 3630-3640. https://doi.org/10.1021/ acs.iecr.5b03301.
[7] Li, Q., Li, M. & Kuang, S, B. (2014). Computational study on the behaviours of supersonic jets and their impingement onto molten liquid free surface in BOF steelmaking. Canadian Metallurgical Quarterly. 53(3), 340-351. https://doi.org/10.1179/1879139514Y.0000000124.
[8] Li, M., Li, Q. & Zou Z. (2017). Computational investigation of swirling supersonic jets generated through a nozzle-twisted lance. Metallurgical and Materials Transactions B. 48, 713-725. https://doi.org/10.1007/s11663-016-0851-2.
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[10] Zhou, X., Ersson, M. & Zhong, L. (2014). Mathematical and physical simulation of a top blown converter. Steel research international. 85(2), 273-281. https://doi.org/10.1002/ srin.201300310.
[11] Hu, S., Zhu, R., & Dong, K. (2018). Effect of oxygen flow rate and temperature on supersonic jet characteristics and fluid flow in an EAF molten bath. Canadian Metallurgical Quarterly. 57(2), 219-234. https://doi.org/10.1080/00084433. 2017.1409945.
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[14] Feng, C., Zhu, R. & Dong, K. (2021). Effects of ambient temperature and powder gas ratio on jet characteristics of O2+ CO2 and CaO particles injected by a swirl-type oxygen lance nozzle. Powder Technology. 388, 537-553. https://doi.org/10.1016/j.powtec.2021.04.085.
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Authors and Affiliations

Haoran Ma
1
Guangqiang Liu
2
Chengcheng Xu
3
Kun Liu
1
ORCID: ORCID
Peng Han
1

  1. College of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 3114051, China
  2. College of Civil Engineering, University of Science and Technology Liaoning, Anshan 114051, China
  3. Cold rolling mill plant, ANGANG Steel Company Limited, Anshan 114021, China
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Abstract

Recent studies have shown that over half of the world’s population lives in urban areas, with the number of people living in slums growing by over 20 million per year and people living in urban areas lacking access to adequate sanitation. This study presents a review of the challenges facing fecal sludge management (FSM). A globally relevant issue in developing urban centers, especially in selected developing countries in West Africa was discussed. Some key findings of the review are that effective sanitation in developing areas depends on the chain of services and that one of the largest problems in sanitation is FSM. This study presents the initial steps toward understanding the main issues involving FSM in developing cities of West Africa. Results are intended to be used as a support for decisions on policies, strategies for FSM, and investments for improved treatment facilities in the region. The study suggests that governments and private sector organizations should develop adequate measures for handling fecal sludge.

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Authors and Affiliations

Emmanuel Alepu Odey
Bodjui Olivier Abo
Abdulmoseen Segun Giwa
Zifu Li
Keywords cukrzyca glukoza
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Abstract

The Bulletin of the Polish Academy of Sciences: Technical Sciences (Bull.Pol. Ac.: Tech.) is published bimonthly by the Division IV Engineering Sciences of the Polish Academy of Sciences, since the beginning of the existence of the PAS in 1952. The journal is peer‐reviewed and is published both in printed and electronic form. It is established for the publication of original high quality papers from multidisciplinary Engineering sciences with the following topics preferred: Artificial and Computational Intelligence, Biomedical Engineering and Biotechnology, Civil Engineering, Control, Informatics and Robotics, Electronics, Telecommunication and Optoelectronics, Mechanical and Aeronautical Engineering, Thermodynamics, Material Science and Nanotechnology, Power Systems and Power Electronics.

Journal Metrics: JCR Impact Factor 2018: 1.361, 5 Year Impact Factor: 1.323, SCImago Journal Rank (SJR) 2017: 0.319, Source Normalized Impact per Paper (SNIP) 2017: 1.005, CiteScore 2017: 1.27, The Polish Ministry of Science and Higher Education 2017: 25 points.

Abbreviations/Acronym: Journal citation: Bull. Pol. Ac.: Tech., ISO: Bull. Pol. Acad. Sci.-Tech. Sci., JCR Abbrev: B POL ACAD SCI-TECH Acronym in the Editorial System: BPASTS.

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Authors and Affiliations

Natalia Marek-Trzonkowska
Piotr Trzonkowski

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