Numerical study on the flow and heat transfer characteristics in a dimple cooling channel with a wedge-shaped vortex generator

Yang, Jae Sung; Jeong, Myung-Geun; Park, Yong Gap; Ha, Man Yeong

doi:10.1016/j.ijheatmasstransfer.2019.03.072

Cited by 21 publications

(7 citation statements)

References 18 publications

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“…At the outlet: Steady and incompressible laminar flow was considered without considering the volume force and viscosity dissipation. The governing equations were as follows [14].…”

Section: Physical Model Methods and Formulationsmentioning

confidence: 99%

“…where ω n was the vortex flux along the main flow direction. The thermal performance factor [14,23] was defined as:…”

Section: Physical Model Methods and Formulationsmentioning

confidence: 99%

“…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%

“…Li et al [12] experimentally studied a fin with radiantly arranged VGs and showed that the fin with radiantly arranged VGs had a better comprehensive performance. Song et al [14] summarized different geometric shapes of VGs in the open literature and found that the concave-curved VG had better thermal performance than the normal-plane VG. Yang et al [15] reported that wedge-shaped VGs can lead to an increase in volume-goodness factor of up to 30% compared with the dimple channel without VGs.…”

Section: Introductionmentioning

confidence: 99%

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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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“…At the outlet: Steady and incompressible laminar flow was considered without considering the volume force and viscosity dissipation. The governing equations were as follows [14].…”

Section: Physical Model Methods and Formulationsmentioning

confidence: 99%

“…where ω n was the vortex flux along the main flow direction. The thermal performance factor [14,23] was defined as:…”

Section: Physical Model Methods and Formulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Although various methods and materials have been used to improve cooling tower performance, no studies have explored vortex generators inside the fill in a cooling tower to increase heat transfer and the tower's efficiency. In fact, heat transfer can be increased by adding a vortex generator [14], which causes flow instability (turbulence) and the development of boundary layers and vortices [15]. The vortices themselves are affected by an increase in the Re number and the height of the vortex generator [16,17].…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement of a Forced Draught Cooling Tower Using a Vortex Generator

Mugisidi¹,

Heriyani²,

Gunawan³

et al. 2021

CFDL

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Cooling systems using colling towers are often an important element in a production process and always involve water or energy consumption. Therefore, increasing the efficiency of the colling tower will reduce water and / or energy consumption. In order to increase the efficiency of colling tower energy consumption, the most studied part is the fills, where heat transfer occurs. However, there are no studies on the use of vortex generators in colling tower fills. Hence the aim of this study was to evaluate the performance improvement in a forced draught cooling tower using a vortex generator. It was conducted on a laboratory scale using single fill as a trial medium. The fill was made of 3-mm acrylic with dimensions of 30 × 30 × 1950 mm. A three-unit vortex generator was placed inside the fill. The rectangular vortex generator was made of 0.5-mm thick aluminium and had a size of 50 × 10 mm. Data were retrieved for the fills with and without a vortex generator. Water and air discharge of 1 L/minute and an inlet water temperature of 60°C were maintained. The results indicated that the effectiveness of the fill with a vortex generator was increased by 90.72% compared to the fill without a vortex generator.

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Direct numerical simulation of flow characteristics and heat transfer enhancement in a rib-dimpled cooling channel

et al. 2022

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Numerical study on the flow and heat transfer characteristics in a dimple cooling channel with a wedge-shaped vortex generator

Cited by 21 publications

References 18 publications

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

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

Performance Improvement of a Forced Draught Cooling Tower Using a Vortex Generator

Direct numerical simulation of flow characteristics and heat transfer enhancement in a rib-dimpled cooling channel

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