Flow and heat transfer in cross-stream type T-junctions: A computational study

Krumbein, Benjamin; Termini, Vincenzo; Jakirlić, Suad; Tropea, Cameron

doi:10.1016/j.ijheatfluidflow.2018.03.013

Cited by 9 publications

(2 citation statements)

References 20 publications

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“…In recent years, several kinds of hybrid RANS-LES models such as Delayed Detached Eddy Simulation (DDES) and Scale-Adaptive Simulation (SAS) were developed for resolving turbulent structures. Zeng et al [14], Krumbein et al [15], and Chang et al [16] employed different hybrid RANS-LES models to simulate the mixing flows in tee pipes. It was found that the results of hybrid RANS-LES models are very close to the experimental data and that of LES.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Non-Isothermal Mixing Flow Characteristics with ELES Method

Sun

Wang²,

Jiang

et al. 2022

Applied Sciences

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Thermal fatigue caused by turbulent thermal mixing in tee pipes is always one of the failure factors of industrial pipes. At present, computational fluid dynamics (CFD) is still the main research method to study the thermal fatigue mechanism. Due to the limitations of the large eddy simulation (LES) model and the classical Reynolds Averaged Navier–Stokes (RANS) model in simulating thermal mixing, an advanced Embedded LES (ELES) model was developed. By comparing the model with data in the open literature, the validity of the ELES model to iso-thermal mixing was evaluated and proven. After that, the flow characteristics of the backflow upstream with different momentum ratios (MR) were studied using the ELES method, as well as the temperature characteristics near the wall where the backflow appears. It was found that the characteristics of the backflow and the temperature distribution upstream in the tee were different with different MR values and some regions under specified MR values are found to be more prone to thermal fatigue at the intersection of the tee upstream. Moreover, the frequency analysis at specified points near the wall under three different MR values was estimated to evaluate thermal fatigue and the results showed that long-period fluctuations of lower frequencies than 6 Hz upstream were observed. This work helps form a comprehensive understanding of the backflow in thermal mixing and the relationship between fatigue and backflow in the tee.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Non-Isothermal Mixing Flow Characteristics with ELES Method

Sun

Wang²,

Jiang

et al. 2022

Applied Sciences

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“…The ranges of this reverse flow and the hot/ cold water mixing range downstream of the T-junction were slightly different for different turbulence models. Krumbein et al [19] presented a study on the ability of a computational model based on very large eddy simulation (VLES) in the thermal mixing of flow-crossing streams in a T-shaped junction, focusing primarily on a configuration subjected to temperature-dependent fluid property conditions. The results obtained from the VLES model followed strongly the direct numerical simulation (DNS) data presented in Hattori et al [20] with respect to velocity, temperature fields, and turbulent quantities in different characteristic regions of the flow domain.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the thermal mixing enhancement in a T-junction pipe

Hekmat

Saharkhiz

Izadpanah

2019

J Braz. Soc. Mech. Sci. Eng.

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In this paper, three-dimensional numerical simulations are conducted to study the thermal mixing of turbulent flow in a T-junction with hot fluid flowing in the main pipe and cold fluid in the branch. The main objective is to investigate the effects of the axial and cross-injection angles to the main pipe and the branch-to-main flow rate ratio on the turbulent thermal mixing. In this regard, an appropriate mixing index is proposed to evaluate the thermal mixing efficiency. The turbulence model employed in this research is the SST k-ω model that can properly capture the mixing behavior of the flow in the main pipe. The results show that the cross-injection angle can considerably affect the thermal mixing enhancement. However, the effects of injection angles on the thermal mixing at lower flow rate ratios are more significant.

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