Abstract
Knowledge of the instantaneous flow behaviour of interacting opposing jets, in addition to knowledge of the mean flow, is important for science and practice. Whereas studies often focused on axisymmetric jets, analyses for plane jets are scarce in general and for plane jets in an enclosed domain (i.e. not a (semi-)open environment) in particular, as e.g. encountered in airplane cabin ventilation. In this paper, 2D particle image velocimetry measurements are performed to study isothermal interacting opposing plane wall jets and plane free jets in a generic empty reduced-scale water-filled enclosure. Inlet Reynolds numbers vary from 3450 to 4650. The analyses encompass an inspection of the global flow patterns (in the vertical midplane) and of the flow components (e.g. interaction zone, merged jet, return flows, recirculation cells), using distribution plots, correlation functions and fast Fourier transforms. Vortical structures are also visualised and tracked over time. It is shown that the transient interaction of the opposing wall jets drives a merged jet that resembles a flapping turbulent plane jet. Remarkable are the occasional deviating (more unstable) flow patterns that appear. Furthermore, many vortical structures are present that could enhance mixing within the enclosure. The opposing free jets mainly show quasi-periodic oscillations with a given frequency (Strouhal number around 3.3 × 10–3), comparable to opposing plane free jets mentioned in the literature. Also in this configuration, many different vortices are present that can grow considerably large while transported through the flow domain. Both configurations show a potential for contaminant lock-up (stagnation zones).
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Notes
Xc,IZ: mean value of the (instantaneous) centre location of the interaction zone xc,IZ, which is the location of minimum (zone-averaged) 2D velocity magnitude |v|= (u2 + v2)1/2 within the area between the two ceiling inlets (0.25 < x/H < 1.25) and with height yJ = 2h from the ceiling.
Xc,MJ: mean value of the (instantaneous) centre location of the merged jet xc,MJ, which is the location of maximum (zone-averaged) y-velocity in the merged jet (vJ,m) within the area covered by the full width and 0.3 < y/H < 0.6 (or 8 < yJ/h < 14).
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Acknowledgements
The Research Foundation—Flanders (FWO), is gratefully acknowledged for their financial support of the PhD fellowship of Jo-Hendrik Thysen (project FWO 1150617N) and the funding for the development of the experimental set-up (FWO 1518517N). The authors are grateful to Airbus for supporting the measurement campaign. Special thanks go to Jan Diepens, Geert-Jan Maas and Stan van Asten, members of the Laboratory of the Unit Building Physics and Services at Eindhoven University of Technology, and Ad Holten, member of the Laboratory of the Fluids and Flows (F&F) section at Eindhoven University of Technology, for their valuable contributions.
Funding
Fonds Wetenschappelijk Onderzoek, FWO 1150617 N, Jo-Hendrik Thysen, FWO 1518517 N.
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Thysen, JH., van Hooff, T., Blocken, B. et al. Instantaneous characteristics of interacting opposing plane jets in a generic enclosure measured with PIV. Exp Fluids 64, 19 (2023). https://doi.org/10.1007/s00348-022-03549-9
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DOI: https://doi.org/10.1007/s00348-022-03549-9