Heat transfer characteristics of concave and convex curved vortex generators in the channel of plate heat exchanger under laminar flow

Song, KeWei; Tagawa, Tetsuya; Chen, Zhonghao; Zhang, Qiang

doi:10.1016/j.ijthermalsci.2018.11.002

Cited by 71 publications

(34 citation statements)

References 34 publications

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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: 92%

“…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 experimental results showed that a curved VG with a large size is beneficial for heat transfer when the Reynolds number is large, and a small VG is conducive to heat transfer improvement for a small Reynolds number. The results for the thermal-hydraulic performance of curved concave and convex VGs with different center angles and attack angles are presented in [19]. The curved concave VG has better thermal performance than the normal plane VG, and an optimal center angle exists with the highest thermal performance.…”

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: 92%

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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“…In this study, governing equations with boundary conditions were solved using computational fluid dynamics. The k-ω model was chosen in this numerical simulation because this model is suitable for modeling free shear flow and flow separation in the viscous region [13]. Pressure-velocity coupling was solved by using a semi-implicit method for pressure-linked (SIMPLE) algorithm.…”

Section: Numerical Solutionmentioning

confidence: 99%

Evaluation of thermal and hydraulic of air flow through perforated concave delta winglet vortex generators in a rectangular channel with field synergy principle

Syaiful

Putra

Tauviqirrahman

et al. 2019

AIP Conference Proceedings

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A compact heat exchanger can be found in air conditioning, automotive industry, chemical processing, etc. Most compact heat exchangers use gas as a heating or cooling fluid. However, gas has high thermal resistance, which affects lower heat transfer. In order to reduce thermal resistance on the gas side, the convection heat transfer coefficient is increased. One effective way to enhance the convection heat transfer coefficient is to use a vortex generator. Vortex generators are surface protrusions that are able to manipulate flow resulting in an increase in convection heat transfer coefficient by enhancing the mixture of air near the wall with the air in the main flow. Therefore, this work aims to evaluate the thermal and hydraulic characteristics of airflow through the perforated concave delta winglet vortex generator. This study was conducted on delta winglet vortex generators (DW VGs) and concave delta winglet vortex generator (CDW VGs) with the 45 angle of attack with a number of hole three-holes that applied on every vortex generator with one-line fitting, two-line fitting, and three-line fitting respectively. Results of simulation revealed that heat transfer coefficient (h) for perforated CDW VGs decrease 16.07% and pressure drop decrease 7% compare to that without hole configuration at Reynolds number of 8600. Convection heat transfer coefficient for perforated DW VGs decrease 13.76% and pressure drop decrease 5.22% compare to delta winglet without hole at Reynolds number of 8600.

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“…The thermal performance of fins can be improved by a longitudinal vortex combined with low pressure loss. Vortex generators (VGs) are widely applied as the longitudinal vortex producer in heat exchangers and computational fluid dynamics is the most efficient method for the design and optimization of complex heat exchangers [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Meng et al [5] numerically analyzed the influence of multiple longitudinal vortices on thermal performance.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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The effect of transverse pitch between a pair of delta-winglet vortex generators arranged in a common flow down configuration on the symmetrical flow structure and heat-transfer performance was numerically investigated. The results showed that symmetrical longitudinal vortices form a common flow down region between the vortices. The fluid is induced to flow from the top towards the bottom of the channel in the common flow region, which is advantageous to the heat transfer of the bottom fin. The vortex interaction increases and the vortex intensity decreases along with the decrease in transverse pitch of vortex generators. Vortex interaction has a slight influence on pressure penalty. The Nusselt number decreases with increasing vortex interaction. The vortices gradually attenuate and depart from each other during the process of flowing downward. A reasonable transverse pitch of delta-winglet vortex generators in a common-flow-down configuration is recommended for high thermal performance.

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Heat transfer characteristics of concave and convex curved vortex generators in the channel of plate heat exchanger under laminar flow

Cited by 71 publications

References 34 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

Evaluation of thermal and hydraulic of air flow through perforated concave delta winglet vortex generators in a rectangular channel with field synergy principle

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

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