Effect of Dimple Configuration on Heat Transfer Coefficient in a Rotating Channel

Kim, Seokbeom; Lee, Young Jin; Choi, Eun Yeong; Kwak, Jae Su

doi:10.2514/1.50255

Cited by 18 publications

(3 citation statements)

References 10 publications

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“…Moon and Lau [11] reported that cylindrical pits have a higher heat transfer coefficient and lower flow resistance than spherical pits. Some studies [12][13][14][15] have reported on the influences of dimple parameters on heat transfer and pressure loss characteristics in a dimple-roughened channel in terms of dimple depth, print diameter, spacing and arrangement. Bilen et al [16] and Ramadhan et al [17] studied the effects of different groove shapes (circle, rectangle, trapezoid, and triangle) on the heat transfer performance and flow loss of a channel.…”

Section: Experimental Equipmentmentioning

confidence: 99%

The Influence of Groove Structure Parameters on the Maximum Flow Resistance of a Rectangular Narrow Channel

Cai

et al. 2020

Energies

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In the hydraulically suspended passive shutdown assembly, in order to prevent the liquid suspension rod falling too fast and the outer tube from violent impact, it is necessary to study the way to increase flow resistance. This study added grooves to the wall of the narrow channel to increase its flow resistance. Using the RNG k-ε turbulence model in Fluent, the influence of the groove structure parameters and the Reynolds number on the flow resistance of the narrow channel was discussed to find the optimal groove structure parameters. The results showed that the flow resistance of the narrow channel increased with the increase in the concave–convex ratio, and when the concave–convex ratio was small, the flow resistance decreased with increased groove thickness, while when the concave–convex ratio exceeded a certain critical value, the flow resistance increased with increased groove thickness. Additionally, the growth rate slowed down when the concave–convex ratio was greater than 3:1. As the unit length decreased, the flow resistance first increased and then decreased. When the unit length was 6 mm, the flow resistance reached the maximum. With the increase in the Reynolds number, the intensity of the local high-turbulence kinetic energy clearly increased.

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Section: Experimental Equipmentmentioning

confidence: 99%

The Influence of Groove Structure Parameters on the Maximum Flow Resistance of a Rectangular Narrow Channel

Cai

et al. 2020

Energies

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“…The results showed that for particles with small particle sizes (dp < 20 µm), the thermal network deposition led to a sharp increase in the particle deposition rate, but for particles with larger particle sizes (dp > 20 µm), it remained constant. The literature [28][29][30][31] reports on the effect of parameters such as dimple depth, dimple diameter, dimple spacing, and dimple arrangement on the heat transfer and pressure loss characteristics within the dimple roughened channel. Dimple structures are also commonly used in various engineering applications for enhanced heat transfer, such as heat exchangers [32,33] and cooling devices for electronic components [34].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Turbulent Flow Structure and Particle Deposition in a Three-Dimensional Heat Transfer Duct with Convex Dimples

Han

et al. 2023

Coatings

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In engineering applications, dust deposition on the heat transfer channel greatly reduces the efficiency of heat transfer. Therefore, it is very significant to study the characteristics of particle deposition for thermal energy engineering applications. In this study, the Reynolds stress model (RSM) and the discrete phrase model (DPM) were used to simulate particle deposition in a 3D convex-dimpled rough channel. A discrete random walk model (DRW) was used for the turbulent diffusion of particles, and user-defined functions were developed for collisions between particles and walls. An improved deposition model of rebound between particles was developed. The flow structure, secondary flow, temperature distribution, Q criterion, and particle deposition distribution in the convex-dimpled rough channel were analyzed after a study of the grid independence and a numerical validation. The results showed that these mechanisms affected the flow structure in the flow field. For tiny particles (dp ≤ 10 μm), the presence of convex dimples promoted their deposition. The rates of particle deposition in the presence of convex dimples were 535, 768, 269, and 2 times higher than in smooth channels (particle sizes of 1, 3, 5, and 10 μm, respectively). However, for large particles (dp > 10 μm), although the presence of convex dimples had a certain effect on the location distribution of particle deposition, it had little effect on the deposition rates of large particles, which were 0.99, 0.98, 0.97 and 0.96 times those in the smooth channel, respectively.

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“…Afanasyev et al [9] conducted one of the early investigations on the heat transfer and friction characteristics of a shallow-dimpled plate. Subsequently, many researches on the heat transfer and pressure loss penalty in dimpled channels are focused on the dimple parameters in terms of the dimple depth, dimple print diameter, dimple spacing and dimple arrangements [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations on the effect of convex-dimple streamwise arrangements on the flow and heat transfer characteristics of rectangular convex-dimple-grooved channels

Zhang

Liao

Sundén

2020

Numerical Heat Transfer, Part A: Applications

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Effect of Dimple Configuration on Heat Transfer Coefficient in a Rotating Channel

Cited by 18 publications

References 10 publications

The Influence of Groove Structure Parameters on the Maximum Flow Resistance of a Rectangular Narrow Channel

The Influence of Groove Structure Parameters on the Maximum Flow Resistance of a Rectangular Narrow Channel

Simulation of Turbulent Flow Structure and Particle Deposition in a Three-Dimensional Heat Transfer Duct with Convex Dimples

Numerical investigations on the effect of convex-dimple streamwise arrangements on the flow and heat transfer characteristics of rectangular convex-dimple-grooved channels

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