UNLABELLED Providing adequate indoor air quality while reducing energy consumption is a must for efficient ventilation system design. In this work, we study the transport of particulate contaminants in a displacement-ventilated space, using the idealized 'emptying filling box' model (P.F. Linden, G.F. Lane-serff and D.A. Smeed (1990) Emptying filling boxes: the fluid mechanics of natural ventil...

This study employs computational fluid dynamics (CFD) simulations to evaluate the risk of airborne transmission COVID-19 in low-ceiling rooms, such as elevator cabins, under mechanical displacement ventilation. The take into account effects human body’s thermal environment and respiratory jet on pathogens. results are used propose a potential mitigation strategy based ventilation control reduce...

We developed a prototype laser monitor, consisting of a single laser sensor, to observe chest wall displacement during respiration. With this monitor, respiratory waveforms are expressed as an anterioposterior motion of the chest wall. The purpose of this study was to examine the characteristics and performance of this prototype. Performance was assessed: 1) under static conditions; 2) using a ...

Indoor ventilation is essential for a healthy and comfortable living environment. A key issue to discharge anthropogenic air contamination such as CO $_2$ gas or, of potentially more direct consequence, airborne respiratory droplets. Here, by employing numerical simulations, we study mechanical displacement with wide range rates $Q$ from 0.01 0.1 m $^3$ s $^{-1}$ person . For this scheme, cool ...