Effect of slot-shaped pins on heat transfer performance in the extended jet impingement cooling

Yalçınkaya, Orhan; Durmaz, Ufuk; Tepe, Ahmet Ümit; Uysal, Ünal; ÖZEL, Mehmet  Berkant

doi:10.1016/j.ijthermalsci.2022.107698

Cited by 21 publications

(3 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our previous studies [51,53], it was observed that the combined use of elongated jets and fins increased heat transfer and relatively homogenized heat transfer distribution. Furthermore, these studies were mainly focused on flat surfaces.…”

Section: Introductionmentioning

confidence: 90%

“…The governing equations were discretized with a second-order upwind scheme. Details about the governing equations can be found in our previous work [53]. The air's density, specific heat, dynamic viscosity, and thermal conductivity were 1.094 kg/m 3 , 1007.4 J/kg.K, 1.7879 × 10 −5 Pa.s and 0.027801 W/m.K, respectively.…”

Section: Geometry and Boundary Conditionsmentioning

confidence: 99%

“…Non-uniform heat transfer distribution on the target surface of gas turbine cooling ducts generates internal stress, leading to deformation, cracking, or even structural failure within the material. Although elongated nozzle holes offer a promising method for enhancing heat transfer [52], fins provide more even heat transfer in the test region [30,53,54].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Heat and Flow Characteristics of Aerofoil-Shaped Fins on a Curved Target Surface in a Confined Channel for an Impinging Jet Array

Yalçınkaya,

Durmaz,

Tepe

et al. 2024

Energies

Self Cite

View full text Add to dashboard Cite

The main purpose of this investigation was to explore the heat transfer and flow characteristics of aero-foil-shaped fins combined with extended jet holes, specifically focusing on their feasibility in cooling turbine blades. In this study, a comprehensive investigation was carried out by applying impinging jet array cooling (IJAC) on a semi-circular curved surface, which was roughened using aerofoil-shaped fins. Numerical computations were conducted under three different Reynolds numbers (Re) ranging from 5000 to 25,000, while nozzle-to-target surface spacings (S/d) ranged from 0.5 to 8.0. Furthermore, an assessment was made of the impact of different fin arrangements, single-row (L1), double-row (L2), and triple-row (L3), on convective heat transfer. Detailed examinations were performed on area-averaged and local Nusselt (Nu) numbers, flow properties, and the thermal performance criterion (TPC) on finned and smooth target surfaces. The study’s results revealed that the use of aerofoil-shaped fins and the reduction in S/d, along with surface roughening, led to significant increases in the local and area-averaged Nu numbers compared to the conventional IJAC scheme. The most notable heat transfer enhancement was observed at S/d = 0.5 utilizing extended jets and the surface design incorporating aerofoil-shaped fins. Under these specific conditions, the maximum heat transfer enhancement reached 52.81%. Moreover, the investigation also demonstrated that the highest TPC on the finned surface was achieved when S/d = 2.0 for L2 at Re = 25,000, resulting in a TPC value of 1.12. Furthermore, reducing S/d and mounting aerofoil-shaped fins on the surface yielded a more uniform heat transfer distribution on the relevant surface than IJAC with a smooth surface, ensuring a relatively more uniform heat transfer distribution to minimize the risk of localized overheating.

show abstract

Section: Introductionmentioning

confidence: 90%

Section: Geometry and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heat and Flow Characteristics of Aerofoil-Shaped Fins on a Curved Target Surface in a Confined Channel for an Impinging Jet Array

Yalçınkaya,

Durmaz,

Tepe

et al. 2024

Energies

Self Cite

View full text Add to dashboard Cite

show abstract

Numerical analysis of jet impingement cooling with elongated nozzle holes on a curved surface roughened with V-shaped ribs

Yalçınkaya,

Durmaz

2024

J Therm Anal Calorim

View full text Add to dashboard Cite

Numerical studies were performed in this study to analyze the effect of dimensionless elongated injection holes (G/d = 0.5, 2.0, 4.0, 8.0) on heat and flow characteristics on rib-roughened surfaces with an array of inclined impingement jets. Experimental and numerical data from existing literature were used to validate the numerical solution procedure’s heat transfer and flow characteristics in the semicircular test section. The turbulence equations were solved using the SST k-ω turbulence model by varying the Reynolds number from 5000 to 25,000. The curvature effect and staggered array pattern created an additional stagnation region between adjacent impinging jets on smooth surfaces, leading to a low heat transfer zone. Rectangular cross-sectional V-shaped ribs (VSR) were placed in regions where the stagnation point occurs to eliminate this disadvantage. The effect of different normalized rib heights (Hr/d = 0, 0.2, 0.3, 0.4) and rib angles (α = 30°, 45°, 60°, 90°) on the curved surface was also investigated to increase convective heat transfer performance and achieve more homogenous heat transfer distribution by relatively reducing the effect of thermal stresses. Flow properties, area-averaged and local Nusselt number variations on smooth and ribbed surfaces, and the thermal performance criterion (TPC) were investigated in detail. The results indicated an increase in overall heat transfer and a more evenly distributed measurement region compared to the conventional (unextended jet and smooth surface) jet impingement configuration. The most significant heat transfer enhancement from combining the elongated jets with VSR was 47.23% at Hr/d = 0.2 by reducing the G/d to 0.5. In addition, the highest TPC was determined as 1.07 on the proposed model with G/d = 2.0 and Hr/d = 0.2 at Re = 25,000.

show abstract

Numerical study on Phase-change thermal storage for thermal management of intermittent High-Power devices

Chen

Fan

Zhang

et al. 2023

Applied Thermal Engineering

View full text Add to dashboard Cite

Effect of slot-shaped pins on heat transfer performance in the extended jet impingement cooling

Cited by 21 publications

References 51 publications

Heat and Flow Characteristics of Aerofoil-Shaped Fins on a Curved Target Surface in a Confined Channel for an Impinging Jet Array

Heat and Flow Characteristics of Aerofoil-Shaped Fins on a Curved Target Surface in a Confined Channel for an Impinging Jet Array

Numerical analysis of jet impingement cooling with elongated nozzle holes on a curved surface roughened with V-shaped ribs

Numerical study on Phase-change thermal storage for thermal management of intermittent High-Power devices

Contact Info

Product

Resources

About