Heat transfer enhancement in panel type radiators using delta-wing vortex generators

Garelli, Luciano; Rodriguez, Giselle; Dorella, Jonathan J.; Storti, Mario A.

doi:10.1016/j.ijthermalsci.2018.10.037

Cited by 39 publications

(18 citation statements)

References 26 publications

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“…Visually, the temperature distribution in the channel in the presence of VG is better than the baseline. The placement of VG in the channel increases the temperature distribution due to the counter-rotating pairs of longitudinal vortices, which result in increased fluid mixing [32]. Counter-rotating pairs of longitudinal vortices produce a downwash that pushes the fluid towards the surface of the heated plate resulting in increased local heat transfer coefficients and thinning of the thickness of the thermal and dynamic boundary layers [32,33].…”

Section: Temperature Distributionmentioning

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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Section: Temperature Distributionmentioning

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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“…Therefore, vast investigations have been conducted in the improvement of performance of the car radiator 2,3 . These efforts have different aspects including research on the structure 4 and material of the radiator, investigation of increasing the rate of heat transfer in the cooling fluid of engine that passes through the radiator 5-8 , enhancement of the cooling capacity of the surrounding cool air 9 , proper orientation of radiator by appropriate front-end configuration 10 etc. Research on improving the structure of the radiator also includes various fields, including investigation of application of novel materials to manufacture the radiator, research on shape of tubes and fins and study on geometric optimization of the components of the radiator.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive analytical framework for optimal sizing of louvered fin flat tube car radiators

Hadidi

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the present research, a comprehensive analytical framework is proposed for optimal sizing of louvered fin flat tube car radiators. In order to perform optimal sizing, eleven geometric variables, which are all geometric parameters of the radiator, were selected as the design parameters. These variables include large and small diameters of tubes, length and wall thickness of tubes, fins’ pitch, louvers’ pitch on each fin, length of the fin, louver length and height, fin thickness, number of fins and louver angle on fins. The effects of all of these parameters on the cooling capacity and total weight of the radiator are investigated in the form of single objective optimization problems in which cooling capacity should be maximized and total weight of the radiator should be minimized. Using the proposed framework, the cooling capacity of the radiator has increased by about 8.8% compared to the base design. It is shown that some geometric parameters have the opposite effect on objective functions. Therefore, an analytical multi-objective optimization procedure is proposed to satisfy both of the goals, simultaneously. The values of the geometric parameters determined in this paper are more practical in terms of manufacturing than the values suggested in the base design.

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“…(e) Zig-zag channel with VGs [5] (f) Tube with rectangular-winglet VGs [6] (g) Horizontal plate with rectangular VGs [7] (h) Rectangular channel with miniature cuboid VGs [8] (i) Circular tube with delta winglet VGs [9] (j) Wavy fin with delta winglet VGs [10] (k) Rectangular channel with angled ribs [11] (l) Fin-and-tube heat exchanger with curved VGs [12] (m) Channel with a tetrahedral, full-body VG [13] (n) Radiator with delta-wing VGs [14] (o) Duct with quadruple V-finned twisted tapes [15] (p) Tube with inclined rectangular ribs [16] (q) Channel with a triangular rib [17] Zhai et al [9] conducted a heat transfer experiment to calculate the Nusselt number, friction factor and thermal performance through a circular-tube with delta winglet VGs of various situations. Luo et al [10] proposed a new combination of a different corrugation-angle wavy-type fin and various attack-angle VGs to enhance the overall performance of heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

“…Henze et al [13] experimentally analyzed the speed field as well as the heat transfer inside a channel with one tetrahedral full-body type VG. Garelli et al [14] used a 3D simulation to examine the efficiency of delta-wing VGs for improving the heat transfer in radiators. Using an experimental approach, Promvonge [15] investigated the thermal enhancement inside a duct of square form with twisted tape-attached V-fins.…”

Section: Introductionmentioning

confidence: 99%

Impact of Twisted Fins on the Overall Performances of a Rectangular-Channel Air-Heat Exchanger

Maouedj¹,

Youcef²

2020

MMEP

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Details on the hydrothermal behavior of airflows in a horizontal channel heat exchanger are provided in this paper. The exchanger is equipped with twisted fins under a staggered arrangement. The investigations are achieved with the CFD (Computational Fluid Dynamics) method. Turbulent flows are considered with a Reynolds number (Re) in the range [1.2×10 4 -3.6×10 4 ]. The SST k-ω model is selected to describe the turbulent flows. The flow patterns, thermal fields, Nusselt number (Nu) and the skin friction factor (f) are determined for various flow rates. From the calculations, the suggested design of fins allowed a significant improvement in the heat exchange within the device.

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Heat transfer enhancement in panel type radiators using delta-wing vortex generators

Cited by 39 publications

References 26 publications

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

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

Comprehensive analytical framework for optimal sizing of louvered fin flat tube car radiators

Impact of Twisted Fins on the Overall Performances of a Rectangular-Channel Air-Heat Exchanger

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