Effect of concave rectangular winglet vortex generator on convection coefficient of heat transfer

Syaiful, Syaiful; Sugiri, Gladys; Soetanto, Maria F.; Bae, Myung-whan

doi:10.1063/1.4968278

Cited by 11 publications

(11 citation statements)

References 23 publications

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“…The dimensions of a rectangular channel on the computational domain of numerical simulation are 500 mm x 155 mm x 43 mm. While the dimensions of DWP and CDWP VGs with a diameter of each hole of 5 mm at the angle of attack of 15° is 60 mm x 1 mm x 27 mm, but CDWP has a surface curvature radius of 58 mm [15]. The computational domain of this numerical simulation is a control volume, which is half the volume of the geometry of a rectangular channel.…”

Section: Geometry and Computational Domainmentioning

confidence: 99%

“…Overall, the temperature distribution for the CDWP VGs case is better than for the DWP VGs case, as shown in Figure 7. This is because the longitudinal vortex formed from CDWP VGs is stronger than the longitudinal vortex formed from DWP VGs [15]. Longitudinal vortex causes improved heat transfer due to better mixing of the hot fluid near the wall with the fluid in the main flow.…”

Section: Intensity Of Longitudinal Vortexmentioning

confidence: 99%

“…In the previous study, Syaiful et al [15] numerically investigated the effect of heat transfer rates on a channel using delta winglet pair (DWP) and concave delta winglet pair (CDWP) vortex generators. This numerical simulation was done with/without VGs (baseline), then the air flowed at velocities in the range of 0.4 m/s to 2 m/s at an angle of attack of 30° with one, two, and three pairs of VGs.…”

Section: Introductionmentioning

confidence: 99%

“…They also found an increase in pressure drop of 35.5% and 66.1% of the baseline at 20° attack angles with the use of DW and CDW VGs, respectively. In the following year, Syaiful et al [17] try to evaluate the effect of rectangular concave winglet vortex generators (CRW VGs) on the convection heat transfer coefficient in a rectangular channel experimentally. By using CRW VGs with an attack angle of 30°, the dimensionless heat transfer coefficient was increased by 205%.…”

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: Geometry and Computational Domainmentioning

confidence: 99%

Section: Intensity Of Longitudinal Vortexmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…They defined LV improving the synergy between velocity and temperature field. Syaiful et al (2017) experimentally investigated the effects of a concave rectangular winglet pair (CRWP) VG on heat transfer improvement in the airflow inside a rectangular channel. The results showed that the rate of heat transfer increased by up to 205% at the highest flow rate, but a substantial increase in pressure drop was also found.…”

Section: Introductionmentioning

confidence: 99%

Thermo-hydrodynamics Performance Analysis of Fluid Flow through Concave Delta Winglet Vortex Generators by Numerical Simulation

Syaiful¹,

Ayutasari²,

Soetanto³

et al. 2017

IJTech

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The numerical simulation of heat transfer and pressure drop characteristics was carried out on the airflow through a rectangular channel-mounted vortex generator (VG). The VG was installed on a plate that was attached to the heater. The inlet velocity of the airflow varied from 0.4 to 2.0 m/s. The VGs used in this study were concave delta winglet pairs (CDWPs) with the attack angle of 30° and with variation in the number of rows: one pair, two pairs, and three pairs. The CDWPs are predicted to produce the longitudinal vortex (LV), which increases the intensity of turbulence resulting in better mixing of flow. This, in turn, can improve the heat transfer between the plate surface and the airflow in the rectangular channel. The results showed that the installation of CDWPs does improve the overall heat transfer performance. However, it has the consequences of a greater pressure drop. Based on the variation in the number of rows, the greater the number of pairs of VGs was the greater the convection heat transfer coefficient (h) in both laminar and turbulent flows. The h value was based on the number of row of CDWPs: one pair, two pairs, and three pairs exhibited increases of 65.9108.4%; 34.471%; and 42.2110.7% compared to the baseline, respectively. A great number of rows of VGs also led to an increasing pressure drop value in laminar and turbulent flows. The percentage increases in pressure drop for CDWPs with one pair, two pairs, and three pairs, as compared to the baseline, were 70.192.1%; 123.6161.3%, and 180266.9%, respectively.

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Heat transfer intensification with field synergy principle in a fin‐and‐tube heat exchanger through convex strip installation

Syaiful

Wicaksono

et al. 2022

Engineering Reports

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Improvement of heat transfer using surface protrusion (convex strip) has been effective recently. Surface protrusion is able to improve flow mixing which increases the rate of heat transfer. Therefore, this study aims to improve the heat transfer in a fin-and-tube heat exchanger by fitting convex strips around the tubes. Three-dimensional modeling was carried out by placing four and eight convex strips around the staggered tubes at a constant temperature of 106 • C. The turbulent k-ε model was applied at a Reynolds number range of 3438-15,926.The results of the study indicate that tubes with eight convex strips demonstrated a heat transfer improvement of 40.46%, compared to that with four convex strips. In this case, the TEF is 6.27% higher than the four convex strips. In addition, the synergy angle in the eight convex strips configuration was 0.13% lower than that of the four convex strips configuration. Meanwhile, the flow resistance in the tubes with eight convex strips configurations was 30.96% higher than that of the four convex strips.

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Effect of concave rectangular winglet vortex generator on convection coefficient of heat transfer

Cited by 11 publications

References 23 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

Thermo-hydrodynamics Performance Analysis of Fluid Flow through Concave Delta Winglet Vortex Generators by Numerical Simulation

Heat transfer intensification with field synergy principle in a fin‐and‐tube heat exchanger through convex strip installation

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