Effects of curved vortex generators on the air-side performance of fin-and-tube heat exchangers

Lu, Gaofeng; Zhai, Xiaoqiang

doi:10.1016/j.ijthermalsci.2018.11.009

Cited by 49 publications

(19 citation statements)

References 31 publications

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“…The strength of the longitudinal vortex is observed to be greater in CRWP than in RWP. CRWP has greater longitudinal vortex strength because CRWP has a larger frontal area than that of RWP, which results in a larger longitudinal vortex radius causing in better heat transfer performance [19]. From Figures 10 and 11, it is observed that the longitudinal vortex in the X1 plane is stronger than that in the X2 plane for all types of VG with/without holes.…”

Section: Flow Fieldmentioning

confidence: 94%

“…The mean longitudinal vortex intensity in the spanwise plane at position x (Se x ) is defined by Eq. (24) vortex intensity than that of RWP because the frontal area of the CRWP is larger than that of the RWP and due to the instability of centrifugal force when the flow passes over the CRWP surface [19,31]. The longitudinal distribution of the vortex intensity is shown in Figure 14 for a velocity of 0.4 m/s and Figure 15 for a velocity of 2.0 m/s.…”

Section: Longitudinal Vortex Intensitymentioning

confidence: 98%

“…G. Lu and X. Zhai (2019) conducted a numerical investigation of the flow characteristics through the curved VG on the fin and tube heat exchanger [19]. G. Lu and X. Zhai varied the curvature and angle of attack of VG in their research.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Heat Transfer and Fluid Flow Characteristics in a Rectangular Channel with Presence of Perforated Concave Rectangular Winglet Vortex Generators

Syaiful¹,

Lutfi²

2021

Heat Transfer - Design, Experimentation and Applications

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The high thermal resistance of the airside of the compact heat exchanger results in a low heat transfer rate. Vortex generator (VG) is one of the effective passive methods to increase convection heat transfer by generating longitudinal vortex (LV), which results in an increase in fluid mixing. Therefore, this study aims to analyze the convection heat transfer characteristics and the pressure drop of airflow in a rectangular channel in the presence of a concave rectangular winglet VG on a heated plate. Numerical calculations were performed on rectangular winglet pairs vortex generators (RWP VGs) and concave rectangular winglet pairs vortex generators (CRWP VGs) with a 45° angle of attack and one, two, and three pairs of VGs with and without holes. The simulation results show that the decrease in the value of convection heat transfer coefficient and pressure drop on CRWP with three perforated VG configuration is 4.63% and 3.28%, respectively, of the three pairs of CRWP VG without holes at an airflow velocity of 2 m/s.

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Section: Flow Fieldmentioning

confidence: 94%

Section: Longitudinal Vortex Intensitymentioning

confidence: 98%

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Numerical Investigation of Heat Transfer and Fluid Flow Characteristics in a Rectangular Channel with Presence of Perforated Concave Rectangular Winglet Vortex Generators

Syaiful¹,

Lutfi²

2021

Heat Transfer - Design, Experimentation and Applications

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“…Meanwhile, the curved convex VG has lower thermal performance compared with the plane VG. Lu and Zhai [20] also reported the heat transfer performance of curved VGs. Better performance was attained with three VGs located at certain horizontal and vertical distances.…”

Section: Introductionmentioning

confidence: 99%

Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration

2020

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The generation of longitudinal vortices is an effective method for promoting thermal performance with a relative low-pressure penalty in heat exchangers. The winglet pair can generate symmetrical longitudinal vortices on the cross-section of the channel. The heat transfer and pressure-loss characteristics of a pair of winglet vortex generators with different transverse pitches are numerically studied in this paper. The winglet pair arranged in a common flow up configuration generates a pair of symmetrical longitudinal main vortices with counter-rotating directions. The symmetrical flow structure induces fluid to flow from the bottom towards the top of the channel in the common flow region between the longitudinal vortices. The flow symmetry of the longitudinal vortices and the heat transfer performance are strongly affected by the transverse pitch of the winglet pair owing to the interaction between the longitudinal vortices. The optimal transverse pitch of the studied winglet pair with the best thermal performance is reported. The increments in the vortex intensity and the Nusselt number for the optimal pitch are increased by up to 21.4% and 29.2%, respectively.

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“…Chimres et al (2018) reported that elliptical winglet with 45º attack angle and 130º trailing edge angle to delivered best heat transfer performance. Lu and Zhai (2019) numerically examined the effect of change in VG curvature and attack angle on the thermo-fluid performance of the heat exchanger. Wang et al (2019) considered streamlined tube configuration to augment the overall thermo-fluid performance.…”

Section: Introductionmentioning

confidence: 99%

Parametric Investigation of Wavy Rectangular Winglets for Heat Transfer Enhancement in a Fin-and–Tube Heat Transfer Surface

Sarangi¹,

Mishra²,

Mishra³

2020

JAFM

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In this paper numerical simulations were performed utilizing Computational fluid dynamics code Fluent to investigate the thermo-fluid performance of a wavy rectangular winglet supported fin-and-tube heat exchanger with five inline rows of circular tubes. The influence of wave height, number of waves, wavy winglet length and winglet attack angle on the thermo-fluid performance of the fin-and-tube heat transfer surface has been examined under laminar flow conditions. Further the Plain and wavy rectangular winglets are placed together over different tube locations and their effect on heat transfer and flow resistance is also examined. An enhancement factor has also been discussed to summarize the overall thermo-fluid performance. The results show that increase in the wave height increase both heat transfer and pressure drop, and an optimum wave height could be decided based on the enhancement factor. It is also found that the increase in wavy winglet length guides the flow more effectively towards the tubes wake region. It is also observed that with increase in number of waves the heat transfer performance initially increases and then decreases as the wave pitch becomes very small. For wavy winglet supported heat exchanger the optimum attack angle is found out for maximum enhancement factor.

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Effects of curved vortex generators on the air-side performance of fin-and-tube heat exchangers

Cited by 49 publications

References 31 publications

Numerical Investigation of Heat Transfer and Fluid Flow Characteristics in a Rectangular Channel with Presence of Perforated Concave Rectangular Winglet Vortex Generators

Numerical Investigation of Heat Transfer and Fluid Flow Characteristics in a Rectangular Channel with Presence of Perforated Concave Rectangular Winglet Vortex Generators

Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration

Parametric Investigation of Wavy Rectangular Winglets for Heat Transfer Enhancement in a Fin-and–Tube Heat Transfer Surface

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