NDLI: Movement and control of evaporating droplets released from an open surface tank in the push

Content Provider	Springer Nature Link
Author	Wang, Yi Zou, Yan Yang, Yang Wu, Songheng Zhang, Xinyu Ren, Xiaofen
Copyright Year	2016
Abstract	Push–pull ventilation systems are effective local ventilation methods to control airborne contaminants generated in industrial buildings, among which droplets are typical. In this paper, the numerical simulations of water droplets released from an open surface tank into the push–pull flow field are carried out and the effects of ambient relative humidity and the pull-flow velocity on the ventilation system performance are discussed based on the droplet evaporation and movement. It was found that the movement and evaporation of droplets were closely related to the push–pull flow mechanism and the droplet initial diameter. When the control effect was good due to the presence of air closure in the flow field (pull-flow velocity ranging from 1.5 m/s to 3.0 m/s), droplets were unlikely to move away from the closure and the evaporation of droplets smaller than 40 μm was obvious. Whereas when the control effect was poor (pull-flow velocity equaling 1.0 m/s), large droplets still moved around the tank surface but small droplets were subject to dispersing, and in such a case droplets smaller than 60 μm evaporated obviously. Moreover, the effect of ambient relative humidity (ranging from 0 to 80%) on controlling droplets was rather limited and no more than ±6%. In addition, the system could save airflow rate and energy consumption by reducing the pull-flow velocity which was excessive originally in ventilation design. Finally, the paper put forward a new index to evaluate the control effect from another standpoint based on whether the droplets did harm to the environment.
Starting Page	443
Ending Page	457
Page Count	15
File Format	PDF
ISSN	19963599
Journal	Building Simulation
Volume Number	9
Issue Number	4
e-ISSN	19968744
Language	English
Publisher	Tsinghua University Press
Publisher Date	2016-02-03
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	push–pull ventilation flow physic droplet capture efficiency open surface tank Building Construction Engineering Thermodynamics, Heat and Mass Transfer Atmospheric Protection/Air Quality Control/Air Pollution Environmental Monitoring/Analysis
Content Type	Text
Resource Type	Article
Subject	Building and Construction Energy

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