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Jones TJ, Shetty A, Chalk C, Dufek J, Gonnermann HM. Identifying rheological regimes within pyroclastic density currents. Nat Commun 2024; 15:4401. [PMID: 38782887 PMCID: PMC11116420 DOI: 10.1038/s41467-024-48612-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Accepted: 05/08/2024] [Indexed: 05/25/2024] Open
Abstract
Pyroclastic density currents (PDCs) are the most lethal of all volcanic hazards. An ongoing challenge is to accurately forecast their run-out distance such that effective mitigation strategies can be implemented. Central to this goal is an understanding of the flow mobility-a quantitative rheological model detailing how the high temperature gas-pyroclast mixtures propagate. This is currently unknown, yet critical to accurately forecast the run-out distance. Here, we use a laboratory apparatus to perform rheological measurements on real gas-pyroclast mixtures at dynamic conditions found in concentrated to intermediate pumice-rich PDCs. We find their rheology to be non-Newtonian featuring (i) a yield stress where deposition occurs; (ii) shear-thinning behavior that promotes channel formation and local increases in velocity and (iii) shear-thickening behavior that promotes decoupling and potential co-PDC plume formation. We provide a universal regime diagram delineating these behaviors and illustrating how flow can transition between them during transport.
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Affiliation(s)
- Thomas J Jones
- Lancaster Environment Centre, Lancaster University, Lancaster, UK.
| | - Abhishek Shetty
- Rheology Division, Advanced Technical Center, Anton Paar USA Inc, Ashland, VA, USA
| | - Caitlin Chalk
- Department of Earth, Ocean and Ecological Sciences, University of Liverpool, Liverpool, UK
| | - Josef Dufek
- Department of Earth Sciences, University of Oregon, Eugene, USA
| | - Helge M Gonnermann
- Department of Earth, Environmental and Planetary Sciences, Rice University, Houston, TX, USA
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Palmer K, Parhi A, Shetty A, Sunkesula V, Sharma P. Development of methodology for assessing flowability of milk protein powders using shear failure testing device. J FOOD ENG 2023. [DOI: 10.1016/j.jfoodeng.2023.111450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Ramaraju H, Landry AM, Sashidharan S, Shetty A, Crotts SJ, Maher KO, Goudy SL, Hollister SJ. Clinical grade manufacture of 3D printed patient specific biodegradable devices for pediatric airway support. Biomaterials 2022; 289:121702. [PMID: 36041362 DOI: 10.1016/j.biomaterials.2022.121702] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 07/10/2022] [Accepted: 07/24/2022] [Indexed: 01/01/2023]
Abstract
Implantable patient-specific devices are the next frontier of personalized medicine, positioned to improve the quality of care across multiple clinical disciplines. Translation of patient-specific devices requires time- and cost-effective processes to design, verify and validate in adherence to FDA guidance for medical device manufacture. In this study, we present a generalized strategy for selective laser sintering (SLS) of patient-specific medical devices following the prescribed guidance for additive manufacturing of medical devices issued by the FDA in 2018. We contextualize this process for manufacturing an Airway Support Device, a life-saving tracheal and bronchial implant restoring airway patency for pediatric patients diagnosed with tracheobronchomalacia and exhibiting partial or complete airway collapse. The process covers image-based modeling, design inputs, design verification, material inputs and verification, device verification, and device validation, including clinical results. We demonstrate how design and material assessment lead to verified Airway Support Devices that achieve desired airway patency and reduction in required Positive End-Expiratory Pressure (PEEP) after patient implantation. We propose this process as a template for general quality control of patient-specific, 3D printed implants.
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Affiliation(s)
- Harsha Ramaraju
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA.
| | - April M Landry
- Department of Otolaryngology-Head and Neck Surgery, Children's Healthcare of Atlanta, Emory University, Atlanta, GA, USA
| | - Subhadra Sashidharan
- Division of Cardiothoracic Surgery, Department of Surgery, Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, GA, USA
| | | | - Sarah J Crotts
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - Kevin O Maher
- Division of Cardiology, Pediatric Cardiology, Children's Healthcare of Atlanta, Atlanta, GA, 30322, USA; Department of Pediatrics, Emory University School of Medicine, Atlanta, GA, USA
| | - Steven L Goudy
- Division of Pediatric Otolaryngology, Department of Otolaryngology-Head and Neck Surgery, Children's Healthcare of Atlanta, Emory University, Atlanta, GA, USA
| | - Scott J Hollister
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA.
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Mishra I, Molnar MJ, Hwang MY, Shetty A, Hrenya CM. Experimental validation of the extraction of a particle-particle cohesion model (square-force) from simple bulk measurements (defluidization in a rheometer). Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.117782] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Hartig J, Shetty A, Conklin DR, Weimer AW. Aeration and cohesive effects on flowability in a vibrating powder conveyor. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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6
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Prediction of defluidization behavior using particle apparent viscosity. KOREAN J CHEM ENG 2022. [DOI: 10.1007/s11814-022-1183-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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7
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Influence of particle size on powder rheology and effects on mass flow during directed energy deposition additive manufacturing. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2021.10.059] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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LaMarche WCQ, Liu P, Kellogg KM, Lattanzi AM, Hrenya CM. Toward general regime maps for cohesive‐particle flows: Force versus energy‐based descriptions and relevant dimensionless groups. AIChE J 2021. [DOI: 10.1002/aic.17337] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- W. Casey Q. LaMarche
- Department of Chemical and Biological Engineering University of Colorado Boulder Colorado USA
- Particulate Solid Research Inc., Chicago, IL
| | - Peiyuan Liu
- Department of Chemical and Biological Engineering University of Colorado Boulder Colorado USA
- Pfizer Inc., Groton CT
| | - Kevin M. Kellogg
- Department of Chemical and Biological Engineering University of Colorado Boulder Colorado USA
- The Dow Chemical Company, Lake Jackson, TX
| | - Aaron M. Lattanzi
- Department of Chemical and Biological Engineering University of Colorado Boulder Colorado USA
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI
| | - Christine M. Hrenya
- Department of Chemical and Biological Engineering University of Colorado Boulder Colorado USA
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Chang SY, Li SW, Kowsari K, Shetty A, Sorrells L, Sen K, Nagapudi K, Chaudhuri B, Ma AW. Binder-Jet 3D Printing of Indomethacin-laden Pharmaceutical Dosage Forms. J Pharm Sci 2020; 109:3054-3063. [DOI: 10.1016/j.xphs.2020.06.027] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 06/22/2020] [Accepted: 06/30/2020] [Indexed: 10/23/2022]
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Jange CG, Taku P, Peng S, Dixon MP, Shetty A, Ambrose RK. Cohesivity assessment of semi-crystalline and crystalline powders using a Warren Springs cohesion tester. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.05.077] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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