Markus Hilpert1, Vesna Ilievski2, Shao-Yiu Hsu3, Ana M Rule4, Pablo Olmedo5, German Drazer6. 1. Department of Environmental Health Sciences, Columbia University, United States. Electronic address: mh3632@columbia.edu. 2. Department of Environmental Health Sciences, Columbia University, United States. 3. Department of Bioenvironmental Systems Engineering, National Taiwan University, Taiwan. 4. Department of Environmental Health and Engineering, Johns Hopkins University, United States. 5. Department of Legal Medicine and Toxicology, University of Granada, Spain. 6. Department of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey, United States.
Abstract
HYPOTHESIS: Identification and quantification of harmful chemicals in e-cigarette aerosol requires collecting the aerosolized e-liquid for chemical analysis. In 2016, Olmedo at al. empirically developed a simple method for aerosol collection by directing the aerosol through a sequence of alternating straight and converging tubing sections, which drain the recovered e-liquid into a collection vial. The tubing system geometry and flow conditions promote inertial impaction of aerosolized e-liquid on tube walls, where it deposits and flows into the collection vial. EXPERIMENTS: We use high-speed optical imaging to visualize aerosol transport in proxies of the collection system. We also determined collection efficiencies of various configurations of the collection system. FINDINGS: A turbulent jet emerges from converging conical sections and impinges onto the wall of downstream tubing sections, resulting in inertial impaction and deposition of the aerosol. For inertial impaction to occur the tip radius of the converging section must be small enough for a jet to be formed and the sequence of tubing sections must be curved in a polygon-like manner such that the jet emerging from a converging section impinges on the downstream tube wall. The collection efficiency is significantly smaller without such curvature.
HYPOTHESIS: Identification and quantification of harmful chemicals in e-cigarette aerosol requires collecting the aerosolized e-liquid for chemical analysis. In 2016, Olmedo at al. empirically developed a simple method for aerosol collection by directing the aerosol through a sequence of alternating straight and converging tubing sections, which drain the recovered e-liquid into a collection vial. The tubing system geometry and flow conditions promote inertial impaction of aerosolized e-liquid on tube walls, where it deposits and flows into the collection vial. EXPERIMENTS: We use high-speed optical imaging to visualize aerosol transport in proxies of the collection system. We also determined collection efficiencies of various configurations of the collection system. FINDINGS: A turbulent jet emerges from converging conical sections and impinges onto the wall of downstream tubing sections, resulting in inertial impaction and deposition of the aerosol. For inertial impaction to occur the tip radius of the converging section must be small enough for a jet to be formed and the sequence of tubing sections must be curved in a polygon-like manner such that the jet emerging from a converging section impinges on the downstream tube wall. The collection efficiency is significantly smaller without such curvature.
Authors: Leon Kosmider; Andrzej Sobczak; Maciej Fik; Jakub Knysak; Marzena Zaciera; Jolanta Kurek; Maciej Lukasz Goniewicz Journal: Nicotine Tob Res Date: 2014-05-15 Impact factor: 4.244
Authors: Pablo Olmedo; Walter Goessler; Stefan Tanda; Maria Grau-Perez; Stephanie Jarmul; Angela Aherrera; Rui Chen; Markus Hilpert; Joanna E Cohen; Ana Navas-Acien; Ana M Rule Journal: Environ Health Perspect Date: 2018-02-21 Impact factor: 9.031
Authors: Di Zhao; Vesna Ilievski; Vesna Slavkovich; Pablo Olmedo; Arce Domingo-Relloso; Ana M Rule; Norman J Kleiman; Ana Navas-Acien; Markus Hilpert Journal: Environ Res Date: 2021-10-27 Impact factor: 8.431