Article
Engineering, Chemical
Corentin Berger, Maxence Mendez, Alice Micolier, Jean-Luc Ponche, Didier Hauglustaine, Nadege Blond
Summary: High levels of particulate matter (PM) in indoor environments are a major concern for human health. INCA-Indoor is an IAQ model capable of simulating over 1200 gaseous species in various rooms of a building. This study focuses on the model's aerosol module, which accurately simulates aerosol formation, growth, deposition, and exchanges in indoor environments. Comparisons with measurements from atmosphere simulation chambers confirm the model's ability to reproduce the evolution of diesel soot particles and the formation of secondary organic aerosols (SOA) through ozonolysis.
JOURNAL OF AEROSOL SCIENCE
(2023)
Article
Thermodynamics
F. Lefevre, M. Al Masri, J. Ibrahim, C. Veillas, I Verrier, F. Celle, O. Parriaux, Y. Jourlin, S. Cioulachtjian
Summary: Surface plasmon resonance (SPR) is a technique that allows sub-wavelength measurements in real time and non-invasively. This study implemented the grating-coupled SPR method on aluminium samples to investigate phase change phenomena. The results showed that surfaces with sub-micrometric grooves and a small number of evenly distributed holes have the best thermal characteristics. Additionally, SPR proved useful in monitoring the formation of nanoscale condensation films and acetone film evaporation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Yusuf Rahmatullah, Tsrong-Yi Wen
Summary: This paper proposes a novel numerical scheme for vapor chamber simulations, which takes into account flow compressibility and temperature variations within the vapor core. The scheme uses mass/energy source terms based on the Lee model at liquid-vapor interfaces, and does not require presetting the phase change behavior. The results show good agreement between simulations and experiments, demonstrating the numerical stability and applicability of the proposed scheme.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Environmental
Kelsey R. Bilsback, Yicong He, Christopher D. Cappa, Rachel Ying-Wen Chang, Betty Croft, Randall Martin, Nga Lee Ng, John H. Seinfeld, Jeffrey R. Pierce, Shantanu H. Jathar
Summary: A study shows that experimental artifacts in environmental chambers can affect atmospheric models of secondary organic aerosol (OA). By combining a box model and a pseudo-atmospheric simulation, we derived parameters for use in chemical transport models and found that the effects of V2PWL can be ignored.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Thermodynamics
George Damoulakis, Constantine M. Megaridis
Summary: This study presents a novel vapor chamber with wickless wettability-patterned components for efficient heat transfer. By utilizing precise surface wettability patterning, the system harnesses the phase-changing properties of water to effectively transport liquid and dissipate heat. The unique design and moderate dimensions make this wick-free vapor-chamber heat-spreader apparatus well-suited for a wide range of thermal management applications.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Agronomy
Masahito Ueyama, Azusa Fujimoto, Akihiko Ito, Yoshiyuki Takahashi, Reiko Ide
Summary: By continuously measuring CH4 fluxes in upland forests over seven years, researchers successfully calibrated four modules for CH4 fluxes and predicted future changes in CH4 emissions based on atmospheric CH4 concentrations. After adjusting model parameters, the modules effectively reproduced the seasonality, annual budgets, and interannual variability of CH4 fluxes. Considering uncertainties in the models and potential confounding effects in observations, further understanding the responses of CH4 uptake to rising CH4 concentrations is needed.
AGRICULTURAL AND FOREST METEOROLOGY
(2021)
Article
Environmental Sciences
Hongmei Liu, Jingping Shao, Wei Jiang, Xuedong Liu
Summary: The differentially weighted operator-splitting Monte Carlo (DWOSMC) method is further developed to describe the dynamic behaviors of droplet aerosols. It considers various processes such as coagulation, deposition, condensation, and evaporation. The results of this method agree well with analytical solutions and other methods, and it can predict the changes in various parameters of droplet aerosol systems.
Article
Nuclear Science & Technology
Clement Loiseau, Stephane Mimouni, Etienne Studer
Summary: During a severe accident in a water-cooled nuclear facility, the release of water vapor may cause pressure increase that can damage containment walls and safety systems. Wall condensation and water spray are two main phenomena that can limit this pressure increase. Numerical results obtained with the neptune_cfd software were compared to experimental results of the French Pressurized Water Reactor to study these safety measures. The study showed that spraying was more effective than wall condensation and droplet diameter was an important parameter.
NUCLEAR ENGINEERING AND DESIGN
(2023)
Article
Thermodynamics
C. F. Camarotti, J. W. Hartwig, J. N. Chung
Summary: The bubble point pressure (APBP) is the most crucial aspect in screen channel liquid acquisition device (LAD) design. Previous results have shown that using helium (GHe) pressurant can increase APBP values of cryogenic liquid nitrogen (LN2), while using gaseous nitrogen (GN2) pressurant can decrease APBP values. However, using warm pressurant always leads to a reduction in APBP regardless of the pressurant gas type. This study found a degradation in GHe APBP but no degradation in GN2 APBP at elevated pressurant bulk gas temperatures (TGB), contradicting historical trends.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Metallurgy & Metallurgical Engineering
Aliyeh Rafiei, Gordon A. Irons, Kenneth S. Coley
Summary: The kinetics of simultaneous decarburization and demanganization of Fe-Mn-C alloys were studied at high temperature, revealing three stages in the process with manganese concentration changes related to carbon content.
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Environmental Sciences
Noora Hyttinen, Iida Pullinen, Aki Nissinen, Siegfried Schobesberger, Annele Virtanen, Taina Yli-Juuti
Summary: Accurate determination of gas-to-particle partitioning is crucial for modeling secondary organic aerosol formation. In this study, we estimated the saturation vapor pressures of alpha-pinene-ozonolysis-derived secondary organic aerosol constituents using experimental and computational methods. The results showed a good agreement between the two methods for molecules with molar masses around 190 g mol(-1) and higher.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Matthew Ozon, Dominik Stolzenburg, Lubna Dada, Aku Seppanen, Kari E. J. Lehtinen
Summary: Bayesian state estimation was applied to the measurement of aerosol size distribution dynamics, showing good agreement with previous methods and true values in four experiments analyzed.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Thermodynamics
Kishan Bellur, Ezequiel F. Medici, Daniel S. Hussey, David L. Jacobson, Jacob LaManna, Juscelino B. Leao, Julia Scherschligt, James C. Hermanson, Chang Kyoung Choi, Jeffrey S. Allen
Summary: Predicting the behavior of evaporation and cryo-storage of liquid hydrogen is challenging due to limited understanding of cryogenic phase change and lack of data for accommodation coefficients. A new cryo/neutron imaging experiment was conducted to determine these coefficients and provide valuable experimental data.
Article
Engineering, Electrical & Electronic
Ariston Reis, Francois Sarrazin, Elodie Richalot, Stephane Meric, Jerome Sol, Philippe Pouliguen, Philippe Besnier
Summary: This article explains the theory and method of performing radar cross section (RCS) pattern measurements within reverberation chambers (RCs), discusses the impact of several parameters on the performances, and confirms the effectiveness of the proposed approach through experiments in different RCs.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Thermodynamics
Angela Mutumba, Francesco Coletti, Alex Reip, Mohamed M. Mahmoud, Tassos G. Karayiannis
Summary: This study presents the single-phase heat transfer and pressure drop characteristics of R1233zd(e) in a Brazed Plate Heat Exchanger (BPHE). The experiments cover a wide range of Reynolds and Prandtl numbers, and the results are used to assess and propose new correlations for heat transfer in BPHEs.
HEAT TRANSFER ENGINEERING
(2023)
Article
Engineering, Environmental
Kelsey R. Bilsback, Yicong He, Christopher D. Cappa, Rachel Ying-Wen Chang, Betty Croft, Randall Martin, Nga Lee Ng, John H. Seinfeld, Jeffrey R. Pierce, Shantanu H. Jathar
Summary: A study shows that experimental artifacts in environmental chambers can affect atmospheric models of secondary organic aerosol (OA). By combining a box model and a pseudo-atmospheric simulation, we derived parameters for use in chemical transport models and found that the effects of V2PWL can be ignored.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Henning Finkenzeller, Siddharth Iyer, Xu-Cheng He, Mario Simon, Theodore K. Koenig, Christopher F. Lee, Rashid Valiev, Victoria Hofbauer, Antonio Amorim, Rima Baalbaki, Andrea Baccarini, Lisa Beck, David M. Bell, Lucia Caudillo, Dexian Chen, Randall Chiu, Biwu Chu, Lubna Dada, Jonathan Duplissy, Martin Heinritzi, Deniz Kemppainen, Changhyuk Kim, Jordan Krechmer, Andreas Kurten, Alexandr Kvashnin, Houssni Lamkaddam, Chuan Ping Lee, Katrianne Lehtipalo, Zijun Li, Vladimir Makhmutov, Hanna E. Manninen, Guillaume Marie, Ruby Marten, Roy L. Mauldin, Bernhard Mentler, Tatjana Muller, Tuukka Petaja, Maxim Philippov, Ananth Ranjithkumar, Birte Rorup, Jiali Shen, Dominik Stolzenburg, Christian Tauber, Yee Jun Tham, Antonio Tome, Miguel Vazquez-Pufleau, Andrea C. Wagner, Dongyu S. Wang, Mingyi Wang, Yonghong Wang, Stefan K. Weber, Wei Nie, Yusheng Wu, Mao Xiao, Qing Ye, Marcel Zauner-Wieczorek, Armin Hansel, Urs Baltensperger, Jerome Brioude, Joachim Curtius, Neil M. Donahue, Imad El Haddad, Richard C. Flagan, Markku Kulmala, Jasper Kirkby, Mikko Sipila, Douglas R. Worsnop, Theo Kurten, Matti Rissanen, Rainer Volkamer
Summary: Iodine is an active trace element in atmospheric chemistry that can destroy ozone and form particles. Its emissions have increased threefold since 1950 and are expected to continue rising. In laboratory experiments, iodooxy hypoiodite (IOIO) was shown to efficiently convert into iodic acid (HIO3) via reactions IOIO + O-3 -> IOIO4 and IOIO4 + H2O -> HIO3 + HOI + O-(1)(2). This laboratory-derived mechanism explains field observations of daytime HIO3 in the remote lower free troposphere and suggests a catalytic role of iodine in aerosol formation.
Article
Chemistry, Analytical
Matson A. Pothier, Erin Boedicker, Jeffrey R. Pierce, Marina Vance, Delphine K. Farmer
Summary: The study shows that cooking organic aerosol (COA) is frequently observed in urban field studies. Few cooking-specific volatility measurements are available, and COA is often assumed to be semi-volatile. The emissions of COA have three chemical components: a biomass burning-like component (COA(BBOA)), a lower volatility component associated with cooking oil (COA(oil-2)), and a higher volatility component associated with cooking oil (COA(oil-1)). The total emissions from cooking can be misclassified in air quality studies that use semi-volatile emissions as a proxy for cooking aerosol.
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2023)
Article
Environmental Sciences
Janica N. D. Gordon, Kelsey R. R. Bilsback, Marc N. N. Fiddler, Rudra P. P. Pokhrel, Emily V. V. Fischer, Jeffrey R. R. Pierce, Solomon Bililign
Summary: Long-term exposure to PM2.5 is the second leading risk factor of premature death in Sub-Saharan Africa. Trash burning, residential solid-fuel burning, and open biomass burning contribute to global and regional PM2.5 pollution and premature mortality. Central Africa has the highest PM2.5-attributed mortalities from open biomass burning, while North Africa and West Africa have the most regional mortalities from trash burning and residential solid-fuel burning, respectively.
Article
Environmental Sciences
Andreas Aktypis, Christos Kaltsonoudis, Ksakousti Skyllakou, Angeliki Matrali, Christina N. Vasilakopoulou, Kalliopi Florou, Spyros N. Pandis
Summary: Two field campaigns were conducted in Patras to measure nucleation frequency. Surprisingly, only 12% of the available measurement days had new particle formation events. However, nucleation mode particles with average diameters of 20-40 nm appeared on 31% of the days. These particles did not grow and were not associated with emissions close to the measurement site, indicating they formed several hours earlier in a different area and were transported to Patras.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Environmental Sciences
Konstantinos Dimitriou, Iasonas Stavroulas, Georgios Grivas, Charalampos Chatzidiakos, Georgios Kosmopoulos, Andreas Kazantzidis, Konstantinos Kourtidis, Athanasios Karagioras, Nikolaos Hatzianastassiou, Spyros N. Pandis, Nikolaos Mihalopoulos, Evangelos Gerasopoulos
Summary: Measurements of PM2.5 concentrations in five major Greek cities were conducted using low-cost sensor-based monitors. The study examined the factors influencing the spatiotemporal variability of PM2.5 levels, including local meteorological parameters and air mass residence time models.
ATMOSPHERIC ENVIRONMENT
(2023)
Review
Geochemistry & Geophysics
Ralph A. A. Kahn, Elisabeth Andrews, Charles A. A. Brock, Mian Chin, Graham Feingold, Andrew Gettelman, Robert C. C. Levy, Daniel M. M. Murphy, Athanasios Nenes, Jeffrey R. R. Pierce, Thomas Popp, Jens Redemann, Andrew M. M. Sayer, Arlindo M. M. da Silva, Larisa Sogacheva, Philip Stier
Summary: Aerosol forcing uncertainty remains the largest climate forcing uncertainty and has not diminished significantly in the past 20 years. This review summarizes the contributions made by satellite observations, atmospheric measurements, modeling, and data assimilation to reduce the uncertainty in aerosol forcing of climate. The review highlights the need for systematic aircraft in situ measurements, suborbital programs, and integration of satellite observations, measurements, and modeling to reduce the persistent uncertainty in aerosol climate forcing.
REVIEWS OF GEOPHYSICS
(2023)
Article
Environmental Sciences
Eleni Karnezi, Liine Heikkinen, Markku Kulmala, Spyros N. Pandis
Summary: Various parameterizations of organic aerosol (OA) formation and its subsequent evolution are evaluated using ground measurements collected during the 2013 PEGASOS field campaign. The performance of different chemical aging schemes is examined, considering biogenic and anthropogenic OA components. All schemes show satisfactory results and predict similar contributions of different OA sources and pathways. Biogenic secondary OA has the highest contribution, followed by anthropogenic secondary OA and oxidation of intermediate-volatility compounds. Primary OA and long-range transport also contribute to OA formation.
Article
Environmental Sciences
Christos Kaltsonoudis, Olga Zografou, Angeliki Matrali, Elias Panagiotopoulos, Alexandros Lekkas, Mariangela Kosmopoulou, Dimitris Papanastasiou, Konstantinos Eleftheriadis, Spyros N. Pandis
Summary: A new gas inlet port and ionization scheme have been developed and coupled to a high-resolution TOF MS for the detection and measurement of atmospheric VOCs and IVOCs. The instrument exhibits superior performance, with linear response to a wide range of organic compounds and detection limits as low as 1 ppt.
Article
Environmental Sciences
Brian T. Dinkelacker, Pablo Garcia Rivera, Julian D. Marshall, Peter J. Adams, Spyros N. Pandis
Summary: Machine learning approaches were used to downscale coarse-resolution CTM predictions to high spatial resolutions, successfully predicting PM2.5 concentrations and source contributions in southwestern Pennsylvania in February and July 2017. The best performing model was a random forest model, which accurately reproduced PM2.5 concentrations for all components and sources.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Environmental Sciences
Evangelia Siouti, Konstantinos Kilafis, Ioannis Kioutsioukis, Spyros N. Pandis
Summary: Residential biomass burning is a major source of air pollution during winter in urban areas. However, predicting the corresponding particle emissions is difficult and models often struggle to reproduce observed particulate matter concentrations. This study combines measurements from PM sensors and a chemical transport model to estimate the spatial and temporal distribution of biomass burning emissions in an urban area. The results show high emissions from biomass burning, with peak concentrations occurring at nighttime.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Engineering, Environmental
Mackenzie B. Humes, Jo E. Machesky, Sunhye Kim, Oladayo J. Oladeji, Drew R. Gentner, Neil M. Donahue, Albert A. Presto
Summary: Asphalt, commonly found in cities, can emit primary and secondary organic aerosols. The emission rate and composition depend on temperature, and emissions have been observed at both application temperatures and warm surface temperatures. Primary organic aerosols only form at application temperature, while secondary organic aerosols form under both conditions. Both types of aerosols are semi-volatile. Passive asphalt heating can also lead to the formation of secondary organic aerosols, making it a potential long-term source of summertime aerosols in urban environments.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Archaeology
Angeliki Matrali, John K. Kodros, Maria Papathanasiou, Spyros N. Pandis
Summary: Soiling of cultural heritage due to air pollution is a major challenge for the conservation community, and this study aims to understand the optical degradation of paintings exposed to particulate matter. The experiment shows that moderate ambient pollution can lead to perceptible color changes in less than a year, indicating the vulnerability of unprotected artwork.
JOURNAL OF CULTURAL HERITAGE
(2023)
Article
Chemistry, Physical
Jani Hakala, Neil M. Donahue
Summary: The pressure dependence of carbonyl oxide (Criegee intermediate) stabilization can be measured using chemical ionization mass spectrometry. By conducting experiments at different pressures, the pressure dependence of the stabilization can be determined.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Environmental Sciences
Xiaohui Qiao, Xiaoxiao Li, Chao Yan, Nina Sarnela, Rujing Yin, Yishuo Guo, Lei Yao, Wei Nie, Dandan Huang, Zhe Wang, Federico Bianchi, Yongchun Liu, Neil M. M. Donahue, Markku Kulmala, Jingkun Jiang
Summary: This study demonstrates the usefulness of machine learning in attributing atmospheric oxygenated organic molecules (OOMs) to their precursors. The model is trained and tested using chemical indicators and applied to analyze OOMs in Beijing and a boreal forest environment in Finland.
ENVIRONMENTAL SCIENCE-ATMOSPHERES
(2023)