Experimental study on turbulent mixing process in cross-flow type T-junction

Hirota, Masafumi; Mohri, E.; Asano, Hideo; Goto, Hiroki

doi:10.1016/j.ijheatfluidflow.2010.04.006

Cited by 36 publications

(4 citation statements)

References 23 publications

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“…The transient simulation by using the SAS-SST scale resolving turbulence model approach has been carried out for 1 second real time with a time step of t=0.0001s Figure 3 shows the spanwise variation of the longitudinal flow velocity distribution obtained with the SAS model. The behaviour is similar to that found experimentally by Hirota et al, [1] specially the boundary layer reattachment occurring at nearly four times the width of the branch after the last edge of the T-junction.…”

Section: Solution Methodologysupporting

confidence: 89%

“…This paper uses the well documented experiment done by Hirota et al, [1] as benchmark for CFD validation. In their project, Hirota et al, [1] have been conducting experimental study on turbulent mixing of hot and cold airflows in a T-junction with rectangular cross section.…”

Section: Introductionmentioning

confidence: 99%

“…In their project, Hirota et al, [1] have been conducting experimental study on turbulent mixing of hot and cold airflows in a T-junction with rectangular cross section. In their experimental data, the authors provide detailed measurements of both dynamical and thermal turbulent fields.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study on turbulent mixing process in cross-flow type T-junction

Azzi¹,

Nemdili²,

Dellil³

2015

AIP Conference Proceedings

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We report three-dimensional simulation results of thermal mixing in square T-junction configuration at high Reynolds number. The square T-junction configuration with different channel sizes was studied experimentally at the Department of Mechanical Engineering of Mie University, Japan. The T-Junction was selected as a benchmark for thermal mixing in the ERCOFTAC Workshop held in EDF Chatou, France, 2011. RANS, URANS and SAS simulations were performed with CFD code using finite volume method The comparison shows excellent agreement between SAS and the data.

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Section: Solution Methodologysupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical study on turbulent mixing process in cross-flow type T-junction

Azzi¹,

Nemdili²,

Dellil³

2015

AIP Conference Proceedings

View full text Add to dashboard Cite

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“…The shear-layer roll-up is also observed on the cross-sections close to the jet entrance region where it resembles a mushroom-like eddy (also observed in T-junction flow [48]). It seems this might be originated by the vorticity generated by the fluid flowing around the jet.…”

Section: Effects Of Different Inlet Flow Profiles On Transient Flow B...mentioning

confidence: 65%

Mean Flow, Turbulent Structures, and SPOD Analysis of Thermal Mixing in a T-Junction with Variation of the Inlet Flow Profile

et al. 2022

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This paper investigates the effects of different inlet flow profiles on thermal mixing within a T-junction using CFD simulations with the IDDES-SST turbulence model. The different combinations of inlet flow profiles are related to different stage in the flow entry region. The effects of the inlet flow profile on the mean and transient flow behaviour are assessed, while a spectral proper orthogonal decomposition and power spectral density analysis are performed to assess the underlying flow structures and the predominant frequency modes. It is found that the vortical structures associated with the horseshoe and hovering vortex systems consist of a single roll-up vortex for cases with uniformly distributed boundary conditions (BCs) at the branch inlet whereas a double roll-up vortex is observed for the other cases. The double roll-up vortex enhances the mixing locally due to the entrainment of fluid from the branch pipe in these vortical structures, which then results in a lower mean temperature distribution. The appearance of the secondary vortex pair and the nested vortices is delayed for cases with uniformly distributed BCs at the branch inlet, which again results in lower thermal mixing and consequently higher values of mean temperature when compared with the other cases. It is also found that the vorticity related to the counter-rotating vortex pair as well as to the second pair of vortices rotating in the opposite direction is higher for cases with uniformly distributed BCs at the branch inlet. Lastly, the combinations of inlet flow profiles lead to different coherent structures, and the dominant frequencies are of a Strouhal number of around 0.7 for uniformly distributed profiles at the branch inlet and in the range 0.4–0.5 for the other cases.

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