Numerical simulation on heat transfer characteristics of rectangular vortex generators with a hole

Han, Zhiyu; Xu, Zhiming; Wang, Jingtao

doi:10.1016/j.ijheatmasstransfer.2018.06.081

Cited by 54 publications

(20 citation statements)

References 28 publications

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“…The results of the current study also show that pressure drop increases with the increase in the number of pairs of VGs, as can be seen in Figure 12. The reason is the flow resistance produced by the friction between the flow and the surface of the VGs and the backflow caused by a longitudinal vortex formed from VGs [30]. By comparing Figures 13 and 12, similar tendencies are shown in the use of CDWP VGs.…”

Section: Effect Of Vortex Generator On Pressure Loss Penaltymentioning

confidence: 68%

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: Effect Of Vortex Generator On Pressure Loss Penaltymentioning

confidence: 68%

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

View full text Add to dashboard Cite

show abstract

“…Overall, the convection heat transfer coefficient for the CDW VGs case is higher than that for the DW VGs case because the intensity of the longitudinal vortex produced by the CDW VGs is higher than the DW VGs caused by the pressure difference between VGs [18]. The increase in convection heat transfer coefficient at Reynolds number of 8600 for the case of perforated CDW and DW VGs are 134.29% and 76.19%, respectively, compared to the baseline.…”

Section: Effect Of Vortex Generators On Heat Transfermentioning

confidence: 87%

“…The field synergy principle is a method used to determine the improvement of convection heat transfer [18]. In this method, a decrease in the intersection angle between the velocity vector and the temperature gradient indicates an improvement in convection heat transfer called the field synergy angle (β) [21].…”

Section: Field Synergy Analysismentioning

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 use of rectangular and delta winglet vortex generators generated high flow resistance on fluid flow that pass vortex generator and wake phenomenon in behind of vortex area so the pressure drop was increase. The highest of pressure drop occurred on rectangular winglet vortex generator than delta winglet vortex generator and without vortex generator[6][5].…”

mentioning

confidence: 90%

Flow structure investigation heat transfer enhancement on inner tubular pipe with winglet vortex generator

Mardikus¹,

Malfin²,

Ekaputra³

2019

AIP Conference Proceedings

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Vortices phenomenon becomes one of solutions to enhance heat transfer performance in shell-and-tube type of heat exchanger. Vortex generator is a device that can generate moving vortices of fluid to get good mixing fluid in heat transfer. The aim of this study is to find the effect of rectangular and delta winglet vortex generator if they are applied in inner tubular pipe heat exchanger, especially for shell-and-tube heat exchanger. Two types of winglet vortex generator were mounted in inner circular pipe then examined in turbulent flow with 6000-10000 Reynold numbers. The result of simulation showed that the use of rectangular and delta winglet can improve heat transfer performance.

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Numerical simulation on heat transfer characteristics of rectangular vortex generators with a hole

Cited by 54 publications

References 28 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

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

Flow structure investigation heat transfer enhancement on inner tubular pipe with winglet vortex generator

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