Zhuyang Han

Tsinghua University | TH · Department of Engineering Physics

Airborne transmission of respiratory infectious disease in indoor environment (e.g. airplane cabin, conference room, hospital, isolated room and inpatient ward) may cause outbreaks of infectious diseases, which may lead to many infection cases and significantly influences on the public health. This issue has received more and more attentions from a...

This work focuses on the size distribution of sneeze droplets exhaled immediately at mouth. Twenty healthy subjects participated in the experiment and 44 sneezes were measured by using a laser particle size analyser. Two types of distributions are observed: unimodal and bimodal. For each sneeze, the droplets exhaled at different time in the sneeze...

In this paper, a qualitative and a quantitative risk assessment methods for urban natural gas pipeline network are proposed. The qualitative method is comprised of an index system, which includes a causation index, an inherent risk index, a consequence index and their corresponding weights. The quantitative method consists of a probability assessme...

This present study is dedicated to the analysis of the effects of moving speed, moving direction angle and temperature difference between human body and environment on the convective heat transfer coefficients of the human body. The experiments were carried out in a full-scale cabin with a thermal manikin. Five moving speeds of the manikin (0.2, 0....

Airborne transmission of respiratory infectious disease in large indoor environment can cause outbreaks of infectious diseases, which may lead to many infection cases and significantly influence the public health. This work investigated the aerosol transmission and risk distribution characteristics in larger indoor environment. Eulerian-Lagrangian...

This article investigates the aerodynamic effects of human movement by experiment and numerical simulations. In the experiment, a life-size thermal manikin, a double-track orbit, and a trolley were used to realize human movement, and the velocity distribution of the induced airflow was measured. In the numerical simulations, dynamic meshing was use...

This work aims at analyzing the dynamics mechanism of airflow and fire spread, especially for the effects of human movements on smoke propagation. A numerical investigation method composed of fire parameters and a smoke propagation analysis is proposed in this paper. The diversifications of flow field when human moves are the main part of the smoke...

The aerodynamic effects of human movement can significantly influence the airflow motion and contaminants transmission in enclosed environments such as in aircraft cabins, cinema and conference room, and so it is necessary and important to study the characteristics of these aerodynamic effects. This work focuses on the aerodynamic characteristics o...

Evacuation of occupants in high-rise buildings is one of the most important tasks when the building is subjected to a significant level of fire threat. Since the mechanism of fire spread is too complicated for the trapped people to determine the evacuation route, a real-time evacuation route planning method is needed for rescue and safety managemen...

There are now many high-rise buildings and fires in such building severely threaten urban safety. A real-time quantitative risk assessment method using casualty was developed based on the building structure and fire characteristics to assess and manage risks for high-rise buildings. This method includes acquisition of real-time data, spatial analys...

Natural gas industry is developing rapidly, and its accidents are threatening the urban safety. Risk management through quantitative assessment has become an important way to improve the safety performance of the natural gas supply system. In this paper, an integrated quantitative risk analysis method for natural gas pipeline network is proposed. T...