Heat transfer enhancement of inclined projected winglet pair vortex generators with protrusions

Oneissi, Mohammad; Habchi, Charbel; Russeil, S.; Lemenand, Thierry; Bougeard, D.

doi:10.1016/j.ijthermalsci.2018.08.032

Cited by 50 publications

(8 citation statements)

References 27 publications

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“…The hydrodynamic performance was calculated by measuring the pressure drop of the flow at the inlet and outlet sides of the test specimen. Then, the friction factor was calculated using Equation (5) [33].…”

Section: Parameter Definitionmentioning

confidence: 99%

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Evaluation of Vortex Generators in the Heat Transfer Improvement of Airflow through an In-Line Heated Tube Arrangement

Syaiful

Wahyuni

Yunianto

et al. 2021

Fluids

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Improving heat transfer from surface to airflow is a current research concern for enhancing energy efficiency. The use of vortex generators for improving heat transfer from the surface to the airflow is very effective. Therefore, this study focuses on applying flat and concave vortex generators with and without holes in order to improve heat transfer. In this study, the number of pairs of vortex generators was varied from one to three pairs at a certain angle of attack for various forms of vortex generators. The airflow velocity through the duct was varied in the range of 0.4 to 2.0 m/s at 0.2 m/s intervals. From the investigation results, we observed that the highest thermal performance was found with the use of concave delta winglets without holes for various pairs of vortex generators in terms of the overall Reynolds number. The highest thermal enhancement factor was found to be around 1.42 at a Reynolds number of approximately 9000. From this study, it was also shown that the lowest cost–benefit ratio was about 1.75 at a Reynolds number of approximately 3500 for three pairs of vortex generators.

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Section: Parameter Definitionmentioning

confidence: 99%

“…From the thermal and hydraulic performance determined by Equations ( 2) and ( 5), respectively, the thermal-hydraulic performance can be calculated using Equation ( 6) [33]:…”

Section: Parameter Definitionmentioning

confidence: 99%

Evaluation of Vortex Generators in the Heat Transfer Improvement of Airflow through an In-Line Heated Tube Arrangement

Syaiful

Wahyuni

Yunianto

et al. 2021

Fluids

View full text Add to dashboard Cite

show abstract

“…The

and exergy recovery of the simple two-tube heat exchanger were compared with those of the simple two-tube heat exchanger. Oneissi et al [ 19 ] numerical studied the thermal behavior of IPWPVGs. They pointed that the IPWP has lower pressure loss because of its special design.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigations of Micro Thermal Performance in a Tube with Delta Winglet Pairs

Wang

Zeng

et al. 2021

Micromachines

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In this research, a novel vortex generator (VG) is presented. The experimental and numerical investigations were carried out to study the micro thermal-hydraulic performance in a heated tube. The numerical results showed that the fluid in the core flow region and the near-wall region was fully mixed because of the longitudinal vortices created by the vortex generators. In addition, the experimental results showed that the heat transfer coefficient (h) decreased with the increasing pitch ratio (PR) value, while the friction coefficient exhibited the opposite trend. With the increasing ration angle (RA) numbers, the h values decreased while the f numbers increased. In addition, the maximum and minimum values of the fraction ratio were 1.66 and 4.27, while these values of the Nusselt number ratio were 1.24 and 1.83. The maximum thermal enhancement factor (TEF) was 1.21 when PR = 0.5, RA = 0° and Re = 9090. The heat transfer enhancement mechanism of the vortex generator is explained from the microscopic point of view.

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“…Then, M. Oneissi et al (2018) conducted a numerical study on the increase in heat transfer due to the installation of DWP VGs and inclined projected winglet pair VGs with the k-ω turbulent model [15]. In this three-dimensional simulation, the increase in heat transfer was viewed from the distribution of the Nusselt number, the coefficient of friction, and the vortices.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Heat Transfer and Fluid Flow Characteristics in a Rectangular Channel with Presence of Perforated Concave Rectangular Winglet Vortex Generators

Syaiful¹,

Lutfi²

2021

Heat Transfer - Design, Experimentation and Applications

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The high thermal resistance of the airside of the compact heat exchanger results in a low heat transfer rate. Vortex generator (VG) is one of the effective passive methods to increase convection heat transfer by generating longitudinal vortex (LV), which results in an increase in fluid mixing. Therefore, this study aims to analyze the convection heat transfer characteristics and the pressure drop of airflow in a rectangular channel in the presence of a concave rectangular winglet VG on a heated plate. Numerical calculations were performed on rectangular winglet pairs vortex generators (RWP VGs) and concave rectangular winglet pairs vortex generators (CRWP VGs) with a 45° angle of attack and one, two, and three pairs of VGs with and without holes. The simulation results show that the decrease in the value of convection heat transfer coefficient and pressure drop on CRWP with three perforated VG configuration is 4.63% and 3.28%, respectively, of the three pairs of CRWP VG without holes at an airflow velocity of 2 m/s.

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Heat transfer enhancement of inclined projected winglet pair vortex generators with protrusions

Cited by 50 publications

References 27 publications

Evaluation of Vortex Generators in the Heat Transfer Improvement of Airflow through an In-Line Heated Tube Arrangement

Evaluation of Vortex Generators in the Heat Transfer Improvement of Airflow through an In-Line Heated Tube Arrangement

Numerical and Experimental Investigations of Micro Thermal Performance in a Tube with Delta Winglet Pairs

Numerical Investigation of Heat Transfer and Fluid Flow Characteristics in a Rectangular Channel with Presence of Perforated Concave Rectangular Winglet Vortex Generators

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