Characteristics of Flow Symmetry and Heat Transfer of Winglet Pair in Common Flow Down Configuration

Song, KeWei; Shi, WeiNa; Xiang, Wei; Wang, Liang-Bi

doi:10.3390/sym12020209

Cited by 5 publications

(4 citation statements)

References 23 publications

(34 reference statements)

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“…The thermal performance factor [19,[27][28][29][30] The value of JF is greater than 1.0 when Re > 400, as shown in Figure 11b. JF > 1 means that the heat transfer is improved by the vortex generators under the same pump power.…”

Section: Distributions Of Se Nu F and Jfmentioning

confidence: 94%

“…The thermal performance factor [19,[27][28][29][30] defined in Equation (13) reflects the thermal performance enhancement for different transverse pitch values of the winglets compared with the corresponding model without the winglets. Marginal differences in f are observed for different transverse pitches, as shown in Figure 11a.…”

Section: Distributions Of Se Nu F and Jfmentioning

confidence: 99%

“…The characteristics of the interactions between the two counter-rotating vortices were quantitatively analyzed using Se in [25]. Quantitative studies of vortex intensity indicate that the value of Se in the heat-exchanger channel determines the heat transfer intensity [26], and the optimal VG configuration with the highest thermal performance can be attained by considering the vortex interaction [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Distributions Of Se Nu F and Jfmentioning

confidence: 94%

Section: Distributions Of Se Nu F and Jfmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2020

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“…where S is the area of the inner tube surface. The thermal performance factor is calculated as follows [33][34][35]:…”

Section: Of 15mentioning

confidence: 99%

Heat Transfer Enhancement in a Novel Annular Tube with Outer Straight and Inner Twisted Oval Tubes

Luo,

Song,

Tagawa

et al. 2020

Symmetry

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The thermal-hydraulic performance in a novel annular tube formed by outer straight and inner twisted oval tubes is numerically investigated. An annular tube formed by two straight oval tubes is also studied for comparison. Inner twisted oval tubes with different aspect ratios and twist ratios are studied. The heat transfer is well improved by the symmetrical secondary flow in the annulus. The Nusselt number generally increases when the inner oval tube becomes flatter and the twists stronger in the studied range of geometrical parameters. The largest Nusselt number Nu of the inner twisted tube increases by 116% while the friction factor f increases by only 46% compared with that of the inner straight tube, and the largest value of the thermal performance factor (JF) can be up to 1.9. Correlations of the Nusselt number and friction factor are proposed for laminar and turbulent flows, and the deviations of the correlations are within ±5% and ±4% for Nu and f, respectively.

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Thermal performance of a zig-zag channel formed by two wavy fins mounted with vortex generators

Luo

Song

Tagawa

et al. 2020

International Journal of Thermal Sciences

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Characteristics of Flow Symmetry and Heat Transfer of Winglet Pair in Common Flow Down Configuration

Cited by 5 publications

References 23 publications

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

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

Heat Transfer Enhancement in a Novel Annular Tube with Outer Straight and Inner Twisted Oval Tubes

Thermal performance of a zig-zag channel formed by two wavy fins mounted with vortex generators

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