UFR 4-20 Test Case: Difference between revisions
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The geometry of the reduced-scale enclosure studied in this UFR was cubical with edge L = 0.3 m. A linear ventilation inlet slot was present at the top with a height h<sub>inlet</sub>/L = 0.1 and a width w<sub>inlet</sub>/L = 1, and a linear ventilation outlet was located at the bottom of the opposing wall (h<sub>outlet</sub>/L = 0.0167) | The geometry of the reduced-scale enclosure studied in this UFR was cubical with edge L = 0.3 m. A linear ventilation inlet slot was present at the top with a height h<sub>inlet</sub>/L = 0.1 and a width w<sub>inlet</sub>/L = 1, and a linear ventilation outlet was located at the bottom of the opposing wall (h<sub>outlet</sub>/L = 0.0167) | ||
(see [[UFR_4-20_Description#figure1|Fig. 1]]). | (see [[UFR_4-20_Description#figure1|Fig. 1]]). | ||
The walls had a thickness d (d/L = 8/30). The slot Reynolds number was defined as Re = | The walls had a thickness d (d/L = 8/30). The slot Reynolds number was defined as | ||
Re = U<sub>0</sub>h<sub>inlet</sub>/ν, with U<sub>0</sub> the bulk inlet velocity, hinlet the slot height (see Fig. 1a) and the kinematic viscosity at room temperature | |||
(≈ 20°C). For this study two Re-values were included: Re = 1,000 and | |||
Re = 2,500, which resulted in mixing ventilation driven by a transitional wall jet, including the typical large recirculation cell, jet detachment from the top surface and Kelvin-Helmholtz-type instabilities in the shear layer of the wall jet (van Hooff et al. 2012a). No temperature differences were included (isothermal case); i.e. no buoyancy effects were present. | |||
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Revision as of 14:20, 5 December 2017
Mixing ventilation flow in an enclosure driven by a transitional wall jet
Confined Flows
Underlying Flow Regime 4-20
Test Case Studies
Brief description of the study test case
The geometry of the reduced-scale enclosure studied in this UFR was cubical with edge L = 0.3 m. A linear ventilation inlet slot was present at the top with a height hinlet/L = 0.1 and a width winlet/L = 1, and a linear ventilation outlet was located at the bottom of the opposing wall (houtlet/L = 0.0167) (see Fig. 1). The walls had a thickness d (d/L = 8/30). The slot Reynolds number was defined as Re = U0hinlet/ν, with U0 the bulk inlet velocity, hinlet the slot height (see Fig. 1a) and the kinematic viscosity at room temperature (≈ 20°C). For this study two Re-values were included: Re = 1,000 and Re = 2,500, which resulted in mixing ventilation driven by a transitional wall jet, including the typical large recirculation cell, jet detachment from the top surface and Kelvin-Helmholtz-type instabilities in the shear layer of the wall jet (van Hooff et al. 2012a). No temperature differences were included (isothermal case); i.e. no buoyancy effects were present.
Contributed by: T. van Hooff — Eindhoven University of Technology
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