Premium
Trapping region of impinging jets in a cross‐shaped channel
Author(s) -
Zhang Jingwei,
Yao Tianliang,
Li Weifeng,
El Hassan Mouhammad,
Xu Xinlei,
Liu Haifeng,
Wang Fuchen
Publication year - 2020
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16822
Subject(s) - vortex , trapping , spiral (railway) , mechanics , flow (mathematics) , planar , bubble , planar laser induced fluorescence , residence time (fluid dynamics) , physics , materials science , optics , laser , geology , laser induced fluorescence , mathematical analysis , ecology , computer graphics (images) , mathematics , geotechnical engineering , computer science , biology
This study follows our previous report (Zhang et al., Phys. Fluids, vol. 31, 2019, 034105) by describing the formation and evolution of the engulfment flow in the cross‐shaped channel. First, the flow regimes were studied by planar laser induced fluorescence (PLIF). Results show the formation of a spiral vortex in the center of the chamber and the appearance of a well‐mixed zone inside the spiral vortex. Second, we proposed a novel experimental method to analyze the residence time of the fluid in the chamber, and discover an unexpected trapping region inside the well‐mixed zone. There is almost no fluid transport into or out of this region. Furthermore, three‐dimensional numerical simulation is used to reveal the origination of this trapping region. Simulation results reveal that the fluid recirculates in the trapping region and the flow feature is caused by the bubble‐type vortex breakdown.