Showing papers by "Jacopo Buongiorno published in 2020"
TL;DR: The results point to a gap between expected and realized costs stemming from low resilience to time- and site-dependent construction conditions, which could help deliver real-world cost reductions for technologies with demanding construction requirements.
29 citations
TL;DR: In this paper, the boiling crisis of water under exponentially escalating heat inputs was investigated using a specially-designed experimental apparatus featuring high-speed infrared thermography to measure the time-dependent temperature and heat flux distributions on the boiling surface, and highspeed video diagnostics to image the bubble growth process.
20 citations
Posted Content•
TL;DR: In this paper, a reverse-flow reactor driven by the oscillatory flow of human breath was proposed to achieve a 3-log reduction in viral load with minimal viral impedance within the mask mesh, with partition coefficient around 2.
Abstract: While facial coverings over the nose and mouth reduce the spread of the virus SARS-CoV-2 by filtration, masks capable of viral inactivation by heating could provide a complementary method to limit viral transmission. In this work, we introduce a new virucidal face mask concept based on a reverse-flow reactor driven by the oscillatory flow of human breath. The governing heat and mass transport equation are formulated and solved to analyze designs that evaluate both viral and CO2 transport during inhalation and exhalation. Given limits imposed by the volume and frequency of human breath, the kinetics of SARS-CoV-2 thermal inactivation, and human safety and comfort, heated masks may inactivate SARS-CoV-2 in inflow and outflow to medical grade sterility. We detail one particular design, with a volume of 300 mL at 90 $^\circ$C, that achieves a 3-log reduction in viral load with minimal viral impedance within the mask mesh, with partition coefficient around 2. This study is the first quantitative analysis of virucidal thermal inactivation within a protective face mask and addresses a pressing need for new approaches for personal protective equipment during a global pandemic.
4 citations
TL;DR: In this article, the suppression of nucleate boiling (SNB) phenomenon is investigated using a modern set of diagnostics and a semi-empirical modeling approach, and the experimental results revealed a clear dependency of SNB heat flux and wall superheat on both steam quality and mass flux.