Cheng, Zhu Lei, Nuoa Cao, Guangyu Li, Baizhan
Published in
Journal of Environmental Health Science and Engineering
Most of humans’ lifetime was spent indoor, especially in bedroom. Thus, understanding the characteristics of the sleep microenvironment is a prerequisite for better control and improvement of our sleeping environment. This study investigated the temperature and velocity field above the heads of sleeping people with supine postures, and explored the...
Zhang, Yongzhi Li, Jiayu Liu, Mingxin Liu, Junjie Wang, Congcong
Published in
Building and environment
The purpose of this study was to investigate the influence of large-scale circulation on the flow field in a cabin mockup. The velocity was measured by ultrasonic anemometers (UA). Then, this study analyzed the turbulence kinetic energy spectra of the velocity fluctuation signal. The turbulence kinetic energy spectra of the measurement points refle...
Lorenz, Ralph D. Clarke, Eric S.
Published in
Planetary and Space Science
• In-situ measurements of heat plume and ionization by a radioisotope generator. • Atmospheric electrical conductivity is enhanced by ~100x near generator. • Effects on Mars or Titan lander measurements are discussed. • Titan conductivity enhancement is significant but very localized.
Feng, Guohui Bi, Yang Zhang, Yixian Cai, Yilin Huang, Kailiang
Published in
Sustainable cities and society
Predicting influence of human thermal plume on the diffusion of respiration-produced particles is an important issue for improving indoor air quality through eliminating infectious microbes efficiently. In this study, the Large Eddy Simulation was utilized to predict the effects of thermal plume of different intensities on particle diffusion. Three...
Wang, Ying
This work presents a numerical investigation of a confined thermal plume under the influence of gas radiation. Plumeflow is generated by a linear heat source of constant power density immersed in a cubic cavity. The main aim of this thesis is to characterize the evolution of the plume throughout its transition from steady-state to turbulent regime,...
Wang, Ying Sergent, Anne Saury, Didier Lemonnier, Denis Joubert, Patrice
Influence of gas radiation on a thermal plume initiated by a linear heat source in a confined cavity is investigated through numerical simulations. A 2D pure convection case is first considered to validate the numerical code by comparing the critical Rayleigh number against literature results. Then, simulations are extended to 3D con ars much ear...
Cao, Guangyu Nilssen, Anders M Cheng, Zhu Stenstad, Liv-Inger Radtke, Andreas Skogås, Jan Gunnar
Published in
American journal of infection control
There has been little research on the performance of laminar airflow (LAF) and mixing ventilation (MV) systems regarding clean airflow distribution near a surgical patient in operating rooms (ORs). The objective of this study was to examine the performance of LAF and MV systems in ORs at St Olavs Hospital in Norway. Experimental measurements were c...
Yan, Yihuan Li, Xiangdong Tu, Jiyuan
Published in
Building and environment
This study numerically investigated the thermal effect of human body on the time-dependent dispersion of cough droplets with evaporation process. The thermal flow of human body was imitated using a 3D thermal manikin with real body features, while a recent developed multi-component Eulerian-Lagrangian approach was used to address the effects of inh...
Cao, Guangyu Storås, Madeleine C A Aganovic, Amar Stenstad, Liv-Inger Skogås, Jan Gunnar
Published in
American journal of infection control
Airflow distribution in the operating room plays an important role in ensuring a clean operating microenvironment and preventing surgical site infections (SSIs) caused by airborne contaminations. The objective of this study was to characterize the airflow distribution in proximity to a patient in an orthopedic operating room. Experimental measureme...
Mu, Di Gao, Naiping Zhu, Tong
Published in
Building and environment
The solar radiation can heat the building outer surface, and then cause the upward natural convection flows adjacent to the wall. This phenomenon is especially obvious on a windless sunny day. The near wall thermal plume can drive gaseous pollutants released from lower floors to upper floors. Combined with the effect of ambient approaching wind, th...
