Analysis of pressure drop in T-junction and its effect on thermodynamic cycle efficiency

Lu, Pei; Deng, Shuai; Zhao, Li; Shao, Yawei; Zhao, Dongpeng; Xu, Weicong; Zhang, Ying; Wang, Zhi

doi:10.1016/j.apenergy.2018.09.134

Cited by 14 publications

(3 citation statements)

References 20 publications

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“…Literature about flow phenomena in three-way junctions is extensive, particularly for 90 • T-junctions [16,17,18] [19,20,21] showing a range of experimental techniques to characterize such mixing, whereas Georgiou and Papalexandris [22] studied the same problem with CFD. In the framework of air and EGR mixing, Reihani et al [23] experimentally characterized its impact on compressor performance and Sakowitz et al [24] numerically analyzed the existing turbulent flow mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Analysis of condensation and secondary flows at three-way junctions using optical visualization techniques and computational fluid dynamics

Galindo

Navarro

Tarí

et al. 2021

International Journal of Multiphase Flow

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Section: Introductionmentioning

confidence: 99%

Analysis of condensation and secondary flows at three-way junctions using optical visualization techniques and computational fluid dynamics

Galindo

Navarro

Tarí

et al. 2021

International Journal of Multiphase Flow

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“…The study of the pressure drop in the T-junction is important because it may affect the operation efficiency of all components downstream. Lu et al [21] summarized certain classical models on local pressure drop, such as Chisholm, separated flow, homogeneous flow, and Reimann and Seeger models. Lu et al [22] used the Eulerian model to study the effects of mass fraction taken off through branch (F), liquid density, and viscosity on the local pressure drop and concluded that the effect of viscosity could be neglected.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of liquid‐liquid two‐phase separation and pressure drop characteristics in T‐junctions

et al. 2021

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Based on the Eulerian and k − ε viscous models, a numerical model of liquid-liquid two-phase flow in a T-junction was established. The simulation results were in reasonable agreement with the experimental data. The effects of the mass fraction taken off through branch and mixture velocity on the separation efficiency and pressure drop characteristics were investigated using the validated model. The results illustrate that the separation efficiency first increases and then decreases with an increase in the mass fraction taken off through branch. When the mass fraction taken off through branch is close to the inlet mass quality, the separation efficiency reaches its maximum. The maximum separation efficiency decreases with the increase of the mixture velocity. In addition, the pressure drop from the inlet to the outlet is primarily due to the local resistance at the intersection and frictional resistance in the pipe, and the pressure drop from the inlet to the branch is majorly caused by the gravity in the branch. It was observed that there is a vortex region at the inlet of the outlet pipe, causing pressure losses.

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“…They found that when Re ≥ 320, the T-junction contains four instances of a bubble-type vortex-breakdown-like flow feature, where the dynamics are highly sensitive to spatially localized feedback, especially near the boundaries of the recirculation regions. Lu et al [ 11 ] discussed how a T-junction, as a separator in an emerging thermodynamic cycle, affects the cycle efficiency.…”

Section: Introductionmentioning

confidence: 99%

Coherent Structure of Flow Based on Denoised Signals in T-junction Ducts with Vertical Blades

Wang

Mei

2019

Entropy

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The skin friction consumes some of the energy when a train is running, and the coherent structure plays an important role in the skin friction. In this paper, we focus on the coherent structure generated near the vent of a train. The intention is to investigate the effect of the vent on the generation of coherent structures. The ventilation system of a high-speed train is reasonably simplified as a T-junction duct with vertical blades. The velocity signal of the cross duct was measured in three different sections (upstream, mid-center and downstream), and then the coherent structure of the denoised signals was analyzed by continuous wavelet transform (CWT). The analysis indicates that the coherent structure frequencies become abundant and the energy peak decreases with the increase of the velocity ratio. As a result, we conclude that a higher velocity ratio is preferable to reduce the skin friction of the train. Besides, with the increase of velocity ratio, the dimensionless frequency St of the high-energy coherent structure does not change obviously and St = 3.09 × 10−4–4.51 × 10−4.

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Analysis of pressure drop in T-junction and its effect on thermodynamic cycle efficiency

Cited by 14 publications

References 20 publications

Analysis of condensation and secondary flows at three-way junctions using optical visualization techniques and computational fluid dynamics

Analysis of condensation and secondary flows at three-way junctions using optical visualization techniques and computational fluid dynamics

Numerical investigation of liquid‐liquid two‐phase separation and pressure drop characteristics in T‐junctions

Coherent Structure of Flow Based on Denoised Signals in T-junction Ducts with Vertical Blades

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