Numerical investigation of fluid flow structure and heat transfer in a passage with continuous and truncated V-shaped ribs

Li, Shian; Xie, Gongnan; Sundén, Bengt

doi:10.1108/hff-08-2013-0246

Cited by 12 publications

(4 citation statements)

References 24 publications

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“…The results showed that V-shaped ribs and 45°angled ribs had superior heat transfer performance compared to the W and M-shaped ribs. Li et al (2015) found that truncated Vshaped ribs provided nearly equivalent heat transfer enhancement with a lower pressure loss compared to continuous V-shaped ribs. The experiments of Wang et al (2015) showed that the 45°V-shaped-downstream ribs provided the best thermal performance.…”

Section: Introductionmentioning

confidence: 93%

Thermal performance of angled, V-shaped and leaning-V-shaped ribs in a rotating rectangular channel with 45° orientation

Wang

et al. 2018

HFF

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Purpose The fluid flow in a rotating channel is obviously different from that in a stationary channel due to the existence of Coriolis force, which, in turn, enhances the heat transfer on the trailing side and reduces the heat transfer on the leading side. The purpose of this paper is to study various rib configurations combined with channel orientation on heat transfer and frictional loss in a rotating channel. Design/methodology/approach In the present study, the k-ω SST model was used as the turbulence model. The fluid flow direction in the channel is radially outward. The angle between the rotation axis and leading side is 45°. The channel aspect ratio (W/H) is 2, the blockage ratio (e/Dn ) is 0.1 and the pitch ratio (P/e) is 10. The Reynolds number is fixed at 10,000 and the rotation number varies from 0 to 0.7. Angled ribs, reversed angled ribs, standard V-shaped ribs and outer-leaning V-shaped ribs, are examined. Findings It is found that the reversed angled rib configuration and the outer-leaning V-shaped rib configuration display better heat transfer performance than the V-shaped ribs in rotating condition, which is in contrast to stationary condition. At the leading side, the reversed angled rib and the outer-leaning V-shaped rib show better performance in recovering the heat transfer recession due to the negative effects of the Coriolis force. Research limitations/implications In the present study, the fluid is incompressible with constant thermophysical properties and the flow is steady. Practical implications The results of this study will be helpful in design of ribbed channels internal cooling for turbine blade. Originality/value The results imply that the rib configuration combined with channel orientation significantly impacts the heat transfer performance in a rotating channel. The reversed angled rib and the outer-leaning V-shaped rib show better heat transfer performance than standard V-shaped ribs, especially at high Rotating numbers, which is in contrast to stationary condition. The outer-leaning V-shaped rib has a relatively good heat transfer uniformity along the widthwise direction.

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Section: Introductionmentioning

confidence: 93%

Thermal performance of angled, V-shaped and leaning-V-shaped ribs in a rotating rectangular channel with 45° orientation

Wang

et al. 2018

HFF

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“…The cooling air pumped into the turbine blade internal passage is used to carry off the heat from the hot wall. Many turbulence promoters, rib (Li et al , 2015; Raisee and Rokhzadi, 2009; Singh et al , 2017; Xie et al , 2015), pin fin (Du et al , 2021; Luo et al , 2020; Ye et al , 2019), dimple (Fazli and Raisee, 2019; Rao et al , 2015; Vinze et al , 2019), etc., are arranged on the internal passage wall so as to low the thermal load by promoting the convective heat transfer between the hot wall and cooling air. The turbine blade trailing edge is always arranged with pin-fin arrays to enhance heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of heat transfer characteristics in a pin fin-dimpled channel with different pin fins and dimple locations

Yan

Luo

Zhang

et al. 2022

HFF

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Purpose This paper aims to investigate the influences of dimple location on the heat transfer performance of a pin fin-dimpled channel with upright/curved/inclined pin fins under stationary and rotating conditions. Design/methodology/approach Numerical methods based on a realizable k-ε turbulent model are used to conduct this study. Three kinds of pin fins (upright, curved, inclined) and three dimple locations (front, middle, behind) are studied for Ro varying from 0 to 0.5. Findings On the whole, pin fin plays a dominated role in heat transfer performance compared to dimple. The heading path and interaction of the longitudinal secondary flow and jet-like flow critically affect heat transfer performance. The formation, development and impingement of jet-like flow and longitudinal secondary flow are significantly affected by dimple locations. Dimple at behind position shows the poorest heat transfer enhancement. Originality/value This study is an extend of another previous study in which an innovative curved pin fin is proposed. The originality of this paper is to evaluate the heat transfer performance for the combined cooling structure of dimple and pin fin, which will provide original and useful application and experience for turbine blade design.

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“…Accordingly, how to design the ribs or baffles is important for raising heat transfer in a duct. Li et al (2015) estimated numerically the heat transfer and pressure loss inside a cooling passageway using continuous and truncated 45-deg V-form ribs. Their results displayed that the truncated V-form ribs could improve thermal performance effectively.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer promotion in channel laminar flow employing a slab with slits and inclined ribs protruding across

Perng

2021

HFF

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Purpose The purpose of this study is to promote laminar heat transfer from the channel heated through a slab with slits and inclined ribs protruding across. Design/methodology/approach The novel design of this study is performed through making the slits in the slab (C1–C3: with slits; C4–C6: without slits) and changing the vertical location of this slab (1/4, 1/2 and 3/4 channel height). The thermal fluid characteristics of all cases are analyzed for various Reynolds numbers (500, 1,000, 1,500 and 2,000) by the SIMPLE-C algorithm. Findings The results display that the ribbed slab effectively improves the heat transfer. The slits can modify the flow field in the vortexes around the inclined ribs and remove more heat from this zone to promote the heat transfer. As compared with C0 (without a slab), C2 (the slab with slits and inclined ribs protruding across located vertically on the 3/4 channel height) raises the averaged Nusselt number up to 27.7% at Re = 2,000. As compared with C4 (without slits), C1 (with slits) gains the maximum increase in the averaged Nusselt number by 5.07% at Re = 1,000. Research limitations/implications The constant thermo-physical properties of incompressible fluid and the steady flow are considered in this study. Practical implications The numerical results will profit the design of heated passageway using a slab with slits and inclined ribs protruding across to acquire better heat transfer promotion. Originality/value This slab with slits and inclined ribs protruding across can be applied to the heat transfer promotion and thus be viewed as a useful cooling mechanism in the thermal engineering.

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Numerical investigation of fluid flow structure and heat transfer in a passage with continuous and truncated V-shaped ribs

Cited by 12 publications

References 24 publications

Thermal performance of angled, V-shaped and leaning-V-shaped ribs in a rotating rectangular channel with 45° orientation

Thermal performance of angled, V-shaped and leaning-V-shaped ribs in a rotating rectangular channel with 45° orientation

Numerical analysis of heat transfer characteristics in a pin fin-dimpled channel with different pin fins and dimple locations

Heat transfer promotion in channel laminar flow employing a slab with slits and inclined ribs protruding across

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