Effect of surface modification of a rectangular vortex generator on heat transfer rate from a surface to fluid

Kashyap, Uddip; Das, Koushik; Debnath, Biplab Kumar

doi:10.1016/j.ijthermalsci.2018.01.004

Cited by 36 publications

(13 citation statements)

References 31 publications

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“…From the experiment and simulation results, it can be observed that the pressure drop increases with increasing Reynolds numbers for all cases. The pressure drop in the CDW VGs case is greater than that of the DW VGs case because the frontal area for the CDW VGs is greater than the DW VGs [11]. The increase in pressure drop for perforated CDW VGs cases is 6.85 times to the baseline at Re = 8600.…”

Section: Effect Of Vortex Generators On Pressure Dropmentioning

confidence: 88%

“…Boundary conditions were needed to solve the governing equations used in this work. These boundary conditions in more detail can be seen in the previous paper [11].…”

Section: Numerical Solutionmentioning

confidence: 97%

“…The effect of VGs on heat transfer can be observed by evaluating the value of the convection heat transfer coefficient, which is determined based on the equations listed in Ref. [11]. Figures 5 and 6 show a comparison of the convection heat transfer coefficients for DW and CDW VGs cases resulting from the simulation and experiment.…”

Section: Effect Of Vortex Generators On Heat Transfermentioning

confidence: 99%

“…The result of their study showed that the channel with curved trapezoidal longitudinal vortex generator observes the higher performance of heat transfer compared to that the channel with a trapezoidal longitudinal vortex generator. Uddip Kashyap et al conducted the numerical study with the variation of surface geometry rectangular vortex generator to improve the heat transfer rate [11]. The result of their study showed that the modification on the surface of the vortex generator could increase the heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Effect Of Vortex Generators On Pressure Dropmentioning

confidence: 88%

“…Boundary conditions were needed to solve the governing equations used in this work. These boundary conditions in more detail can be seen in the previous paper [11].…”

Section: Numerical Solutionmentioning

confidence: 97%

Section: Effect Of Vortex Generators On Heat Transfermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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show abstract

“…They found that VGs not only increase heat transfer but also reduce pressure drop. Uddip et al concentrate to know the effect of the rectangular VG surface-texture on heat transfer and dynamic vortex [11]. They explain that multiple and single texturing on leading and trailing edges can enhance the main vortex behind the VG.…”

Section: Introductionmentioning

confidence: 99%

Effect of perforated concave delta winglet vortex generators on heat transfer augmentation of fluid flow inside a rectangular channel: An experimental study

Syaiful

Sinaga

et al. 2018

MATEC Web Conf.

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Compact heat exchanger with gas as a heat exchange medium is widely used in power plants, automotive, air conditioning, and others. However, the gas has a low thermal conductivity resulting in high thermal resistance causing a low rate of heat transfer. Therefore an improvement to the convection heat transfer coefficient is necessary. One way to enhance the convection heat transfer coefficient is to use a longitudinal vortex generator. However, the increase in convection heat transfer coefficient is followed by an increase in pressure drop. Therefore, this work aims to improve the convection heat transfer coefficient with a low pressure drop. To achieve this goal, experiments were carried out by perforating a longitudinal vortex generator with a diameter of 5 mm with variations in holes number one, two and three. Two types of longitudinal vortex generators are compared. The experimental results show that the convection heat transfer coefficient for the case of perforated concave delta winglet vortex generator is only decreased by 1% from that without a hole, while the pressure drop is decreased by 11.6%.

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Flow and heat transfer characteristics in square channel with concave–convex vortex generators based on numerical simulations

Jiang

Chen

Duan

et al. 2020

Asia-Pacific J Chem Eng

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This paper aims to obtain a better heat transfer performance by using vortex generators with different structures in the square channel. To compare the flow pattern of three different vortex generators, the stream‐wise velocity profile, the visualized Q‐criterion, and the stream‐wise vorticity flux distribution were used to obtain the flow structures in detail. The heat transfer performance was quantified by the Nusselt number (Nu) and compared for the different vortex generators. It was found that the concave structure vortex generator has a better heat transfer performance with an increase of about 11.07% for average Nu. This is because the concave vortex generator induces a more complex hydraulic dynamic flow structure due to its two counter rotating vortex pairs in the square channel. Furthermore, the distance from the lower counter rotating vortex pairs to the wall is significantly decreased by the restraint from the upper counter rotating vortex pairs. This can help disturb the thermal boundary layer and improve the heat transfer performance.

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Effect of surface modification of a rectangular vortex generator on heat transfer rate from a surface to fluid

Cited by 36 publications

References 31 publications

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

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

Effect of perforated concave delta winglet vortex generators on heat transfer augmentation of fluid flow inside a rectangular channel: An experimental study

Flow and heat transfer characteristics in square channel with concave–convex vortex generators based on numerical simulations

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