Numerical simulation on performances of plane and curved winglet – Pair vortex generators in a rectangular channel and field synergy analysis

Lu, Gaofeng; Zhou, Guobing

doi:10.1016/j.ijthermalsci.2016.06.024

Cited by 74 publications

(18 citation statements)

References 28 publications

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“…This results in a penetration away from the longitudinal vortex into the wake region, which causes good fluid mixing [7]. This phenomenon is also found in the results of a study by Lu et al [9] with a curved VG. X1, X2, and X3 are cross-section positions at 175 mm, 300 mm and 450 mm, respectively.…”

Section: Parameters Definitionsupporting

confidence: 70%

“…The use of perforated DWP VGs shows a lower pressure distribution compared to that of the perforated CDWP VGs. The hole in the VG causes jet flow, which results in damage to the stagnant fluid behind the VG and damage to the recirculation area[9]. This proves that the hole in the vortex generator causes a decrease in flow resistance, indicating a decrease in pressure drop.…”

mentioning

confidence: 88%

“…In order to understand the longitudinal vortex structure generated by the vortex generator, a non-dimensional parameter called the longitudinal vortex intensity [9,23]…”

Section: Intensity Of Longitudinal Vortexmentioning

confidence: 99%

“…In all Reynolds numbers, longitudinal vortices are more effective than transverse vortices. Lu and Zhou [9] numerically examined several types of vortex generators, namely: rectangular winglets, trapezoidal winglets, delta winglets, curved rectangular winglets, curved trapezoidal winglets, curved delta winglets in a rectangular channel with variations in attack angles of 0°, 30°, 45° and 60°. The results showed that curved trapezoidal winglets with a 45° attack angle provide the best results in enhancing heat transfer.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Heat and Fluid Flow Characteristics of Airflow Inside Rectangular Channel with Presence of Perforated Concave Delta Winglet Vortex Generators

Syaiful¹,

Siwi²,

Utomo³

et al. 2019

IJHT

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This study is intended to analyze numerically and experimentally the characteristics of heat transfer augmentation and pressure drop of airflow through vortex generators mounted to a heated plate inside a rectangular channel. Delta winglet pairs (DWPs) and concave delta winglet pairs (CDWPs) vortex generators (VGs) with one, two, and three rows were used in this study. Heat transfer enhancement and pressure drop of flow passing through the VGs with a 5 mm diameter hole for one, two, and three holes in certain positions were investigated. VGs were mounted in-line with an attack angle of 15° to the flow. The airflow was assumed to be incompressible; the steady-state and air velocity were varied in the range of 0.4 m/s to 2 m/s. The analysis showed that the use of holes in the delta winglet vortex generators could reduce the pressure drop of 34.14% from the delta winglet without holes at a velocity of 2 m/s. By using perforated delta (DWP VGs) and concave delta winglet (CDWP VGs), the heat transfer coefficient is reduced by 1.81% and 7.03% of the delta and concave delta winglet vortex generators without holes at a velocity of 2 m/s.

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Section: Parameters Definitionsupporting

confidence: 70%

mentioning

confidence: 88%

“…In order to understand the longitudinal vortex structure generated by the vortex generator, a non-dimensional parameter called the longitudinal vortex intensity [9,23]…”

Section: Intensity Of Longitudinal Vortexmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Analysis of Heat and Fluid Flow Characteristics of Airflow Inside Rectangular Channel with Presence of Perforated Concave Delta Winglet Vortex Generators

Syaiful¹,

Siwi²,

Utomo³

et al. 2019

IJHT

View full text Add to dashboard Cite

show abstract

“…Chen et al [17] introduced three field synergy numbers for heat, mass and momentum transfer respectively. The conventional FSP was also successfully applied in mechanism analysis of lithium ion battery [18], longitudinal vortices [19][20][21][22], tube with twisted tape [23] and heat exchanger [24][25] etc.…”

Section: Introductionmentioning

confidence: 99%

Unified formula for the field synergy principle

Cui

Zhang

Wang

et al. 2020

Numerical Heat Transfer, Part B: Fundamentals

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The field synergy principle has three criteria to qualitatively describe the essence of convective heat transfer enhancement. However, in practice these criteria are difficult to be applied to convective heat transfer analysis, because there are no corresponding indicators available to quantitatively describe them. Based on these three criteria, a unified formula for the field synergy principle was developed in this study using probabilistic techniques, which is applicable to incompressible flows with constant properties in both laminar and turbulent flow regimes. The formula contains three categories of nondimensional indicators corresponding to the three criteria of the field synergy principle respectively, including domain-averaged cosine of synergy angle, the Pearson linear correlation coefficients between the scalar functions contained in the energy governing equation of convective heat transfer, and the variation coefficients of these functions. The physical meanings of these indicators for the field synergy principle and their connections with the known heat transfer enhancing mechanisms were then discussed. Based on the unified formula, an improved analytical system for the field synergy principle was proposed, which allows an efficient and quantitative analysis of all single-phase constant-property convective heat transfer phenomena. This new system overcomes the limitation of the conventional field synergy analytical system that mainly analyzes the convective heat transfer mechanism from the perspective of synergy angle.

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Effect of transverse vortex on performance of wave plate demister

Yang,

Cui,

Wang

et al. 2023

Asia-Pacific J Chem Eng

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Corrugated plate mist eliminators are commonly employed in industrial processes to eliminate liquid droplets from gas flows. Engineering a mist eliminator with excellent separation performance including high removal efficiency and low pressure drop and is a primary consideration in industrial processes. This study focuses on the separation of tiny droplets reinforced by the generation of transverse vortices with the help of curved wings. The Euler–Lagrange model is developed to predict the behavior of droplets in gas streams, and velocity distributions and particle trajectories on the demisters were derived. And the prediction equations of the curved wing structure sizes on the efficiency and pressure drop of the mist eliminator are established. The results demonstrated that the grade separation efficiency of 10~20 μm droplet was significantly improved by 25.7%~66.51%. Moreover, for the total removal efficiency, it could be improved from .8 to .92 at 5.5 m s−1, and the accompanying resistance factor was as low as 2.7. Among the proposed arrangements, the double‐row single‐column array arrangement was characterized by higher demisting efficiency and lower pressure drop. Overall, compared to other optimization methods, this proposed optimization approach by means of transverse vortices yielded a higher demisting efficiency and less pressure drop.

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Numerical simulation on performances of plane and curved winglet – Pair vortex generators in a rectangular channel and field synergy analysis

Cited by 74 publications

References 28 publications

Numerical Analysis of Heat and Fluid Flow Characteristics of Airflow Inside Rectangular Channel with Presence of Perforated Concave Delta Winglet Vortex Generators

Numerical Analysis of Heat and Fluid Flow Characteristics of Airflow Inside Rectangular Channel with Presence of Perforated Concave Delta Winglet Vortex Generators

Unified formula for the field synergy principle

Effect of transverse vortex on performance of wave plate demister

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