Open AccessAnalysis of the vortex characteristics during roadway ventilation
Author(s) -
Yipei Qi,
Fan Yang,
Hengze Zhao,
Fusheng Wang
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/371/2/022013
Subject(s) - vortex , mechanics , dissipation , turbulence , ventilation (architecture) , vortex stretching , physics , vortex ring , thermodynamics
The ventilation in the roadway is in a turbulent state. As the main body of the ventilation, the vortex rotating produces energy dissipation under viscous force which in turn creates air resistance, and it plays an important role in heat and mass transfer. Considering the importance of the vortex in the roadway ventilation, a series of analyses were made by the Taylor model from the perspective of microscopic to explore the vortex characteristics based on the theory of viscous fluid mechanics and vortex motion. The phenomenon that the radii was increasing as vortex diffusing to the roadway center and the energy dissipation was the biggest near the wall was verified. The survival period of vortex was clarified which has an important effect on analyzing the formation of the turbulence. The paper also established the model of energy dissipation rate unit volume which is helpful to the theory of roadway ventilation. In the final, a proposal was offered that it was better to avoid small scale vortex in the roadway ventilation.