The experimental and numerical investigation of novel type conic vortex generator on heat transfer enhancement

Demirağ, Hüseyin Zahit; Doğan, Mehmet; İğci, Atila Abir

doi:10.1016/j.ijthermalsci.2023.108383

Cited by 20 publications

(1 citation statement)

References 53 publications

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“…Figure 27 A detailed comparison of THPP of SCVG configuration with that of other VG configurations from existing literature is presented in Table 7. The SCVG is found to exhibit greater THPP over a wide Reynolds number range, spanning from 6000 to 21,000, as compared to other commonly used VGs such as truncated hemisphere, 25 modified forms of conical VGs, 27 novel type of conic VG, 48 and delta winglet VG. 49 Notably, the THPP range obtained from present work is well above unity for the entire flow Reynolds number range and is significantly higher than existing modified conical VGs.…”

Section: Correlation Developmentmentioning

confidence: 92%

Thermohydraulic performance augmentation of triangular duct solar air heater using semi‐conical vortex generators: Numerical and experimental study

Pramod,

Madhwesh,

Arunachala

et al. 2024

Heat Trans

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Thermohydraulic performance augmentation using turbulence promotors is a commonly adopted technique in solar air heater (SAH) applications. This article presents the thermohydraulic performance augmentation of triangular duct SAH using semi‐conical vortex generators (SCVG) using computational fluid dynamics and experimental methodology for various flow Reynolds numbers ranging from 6000 to 21,000. An in‐depth parametric analysis is undertaken to establish the influence of flow attack angle, relative longitudinal pitch, relative transverse pitch and cone diameter of SCVG on the thermohydraulic performance as indicated by the thermohydraulic performance parameter (THPP). The results reveal that the SCVG generates longitudinal vortices and introduces flow impingement zones which significantly affects the flow and heat transfer characteristics of air heaters. Correlations for Nusselt number and friction factor are established, which predicts the performance outcomes with an average error of 6.74% and 4.46%, respectively. The optimal THPP is determined to be 1.74 using artificial neural network model and Bonobo Optimization algorithm. The SCVG produces THPP values well above unity for the entire flow Reynolds number range of 6000–21,000.

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Section: Correlation Developmentmentioning

confidence: 92%

Thermohydraulic performance augmentation of triangular duct solar air heater using semi‐conical vortex generators: Numerical and experimental study

Pramod,

Madhwesh,

Arunachala

et al. 2024

Heat Trans

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Numerical investigation of thermo-hydraulic performance of perforated rectangular and sinusoidal vortex generators in a double-pipe heat exchanger

Wang,

Foo,

Tran

et al. 2024

J Therm Anal Calorim

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Vortex generators (VGs) are utilized in heating and cooling systems to enhance heat transfer efficiency for energy savings. This study investigates the thermo-hydraulic performance of using the rectangular vortex generators (RVG) and the sinusoidal vortex generator (SVG) with and without holes on the annular side of a double-pipe heat exchanger (DPHE) for turbulent regimes. The numerical analysis is conducted for different angles of attack (α) (15°, 45°, and 75°) and spacings between VGs (60, 100, and 300 mm). By comparing the heat transfer behavior for a given α, the RVG cases present a higher heat transfer when compared to the SVG cases, with an exception for the 15° case. The configuration with a low α and slight curvature augments flow velocities and vortex strength, thereby enhancing heat transfer efficiency. Moreover, the 15° SVGs-hole case demonstrates a higher Nusselt number compared to the no-hole case. Adding holes in the VG significantly reduces the pressure drop for the 45° and 75° cases, while it remains the same at the 15° case. Additionally, the 75° RVG case yields the highest Nusselt number among the studied cases, with an enhancement of 42.4% when compared to the smooth pipe at the Reynolds number of 5,711. The best performance evaluation criterion (PEC) is achieved by the 15° SVGs-hole case. When the effect of different spacings is examined, the spacing of 60 mm provides the highest PEC of 1.22. In short, the present study provides valuable insights for optimizing VG design and enhancing overall system performance in DPHEs.

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Thermal Performance and Parametrical Analysis of Topologically-optimized Cross-flow Heat Sinks Integrated with Impact Jet

Tang,

Liu,

Tang

et al. 2023

Applied Thermal Engineering

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The experimental and numerical investigation of novel type conic vortex generator on heat transfer enhancement

Cited by 20 publications

References 53 publications

Thermohydraulic performance augmentation of triangular duct solar air heater using semi‐conical vortex generators: Numerical and experimental study

Thermohydraulic performance augmentation of triangular duct solar air heater using semi‐conical vortex generators: Numerical and experimental study

Numerical investigation of thermo-hydraulic performance of perforated rectangular and sinusoidal vortex generators in a double-pipe heat exchanger

Thermal Performance and Parametrical Analysis of Topologically-optimized Cross-flow Heat Sinks Integrated with Impact Jet

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