Numerical investigation on the flow and heat transfer in swirl chambers with distributed multi exit slots and dimple/protrusion structure

Jing, Qi; Xie, Yuanyuan; Zhang, Di

doi:10.1016/j.icheatmasstransfer.2020.104923

Cited by 21 publications

(3 citation statements)

References 27 publications

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“…The results showed that the application of convex structures could minimize the flow resistance. Jing et al [98,99] successively optimized the channel structures applied in jet impingement and swirl cooling, and pointed out that it was better to arrange the protrusion on the side of the nozzle for drag reduction (Figure 9(e3)). characteristic of the microchannel heat sinks with impinging jets (Figure 9(e2)).…”

Section: Concave-convex Structurementioning

confidence: 99%

“…Figure 9. The image of the (a1) dung beetle, (b1) cybister bengalensis, (c1) humpback whale, (d1) dune topography; (a2) The SEM image of the dung beetle head[84], (b2) The SEM image of the cybister bengalensis back[85], (c2) The structure of humpback whale fins[86], (d2) The pits in the desert; (e1) The convex rough surface of the MIRA model, (e2) The microchannel heat sink model with impinging jets with convex dimples[97], (e3) The newly developed swirl chamber with protrusion structure[99]; (f1) The cross-section of microchannel with dimples[96], (f2) The non-smooth surface with ball sockets of train model[91], (f3) The commercial vehicle model with concave structures[94].…”

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confidence: 99%

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Nature-Inspired Structures Applied in Heat Transfer Enhancement and Drag Reduction

Zhu

Peng

et al. 2021

Micromachines

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Heat exchangers are general equipment for energy exchange in the industrial field. Enhancing the heat transfer of a heat exchanger with low pump energy consumption is beneficial to the maximum utilization of energy. The optimization design for enhanced heat transfer structure is an effective method to improve the heat transfer coefficient. Present research shows that the biomimetic structures applied in different equipment could enhance heat transfer and reduce flow resistance significantly. Firstly, six biomimetic structures including the fractal-tree-like structure, conical column structure, hybrid wetting structure, scale structure, concave-convex structure and superhydrophobic micro-nano structure were summarized in this paper. The biomimetic structure characteristics and heat transfer enhancement and drag reduction mechanisms were analyzed. Secondly, four processing methods including photolithography, nanoimprinting, femtosecond laser processing and 3D printing were introduced as the reference of biomimetic structure machining. Finally, according to the systemic summary of the research review, the prospect of biomimetic heat transfer structure optimization was proposed.

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Section: Concave-convex Structurementioning

confidence: 99%

mentioning

confidence: 99%

Nature-Inspired Structures Applied in Heat Transfer Enhancement and Drag Reduction

Zhu

Peng

et al. 2021

Micromachines

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“…By comparing the variable hole outlet shapes with the traditional round hole, it is noteworthy that the bean-shaped hole has the better cooling conditions. Jing et al 13 adopted a new cyclone cooling method with multi exit slots, for which different outlet configurations are considered. At the same time, dimples/protrusions were introduced into the cyclone chamber in various arrangements for comparative analysis.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on vortex cooling flow and heat transfer characteristics for gas turbine blade with variable coolant chamber cross-sectional shapes

Li,

Gao,

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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In this paper, according to the actual size of gas turbine blade interior space, eight vortex cooling models with different cross-sectional shapes of coolant chambers are established. Rectangular, Circle, Trapezoidal up, Trapezoidal down, Ellipse up, Ellipse down, Sine up and Sine down are the eight coolant chamber shapes. Functions of variable coolant chamber structures on vortex cooling flow and heat exchange characteristics are numerically analyzed by verifying the Standard k- ω turbulence model and conducting grid independence analysis. Research results show that the heat exchange ability of Sine up coolant chamber is the best compared with the other coolant chambers. The cool air enters the vortex chamber at a faster speed and impacts on the target surface to form a high-pressure area and a low-temperature swirl. The more the cool air moves downstream, the greater the turbulent kinetic energy becomes, which is more conducive to the heat transfer. Therefore, Sine up coolant chambers have the highest thermal performance factor. Due to the low drag coefficient and high target surface average Nusselt number of Ellipse up, its thermal exchange performance is second only to that of Sine up. Circle coolant chamber will not bring favorable factors to engineering application because of the slowest flow speed and the worst heat exchange capacity. For Trapezoidal up and Trapezoidal down, the flow velocity, pressure distribution, turbulent kinetic energy intensity and heat transfer uniformity are almost the same as Rectangle coolant chamber. The models of Ellipse down and Sine down coolant chambers exhibit less turbulent kinetic energy strength to heat transfer and higher temperature in the vortex chamber, and it is not suggested for cooling system optimal design.

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Effects of Variable Jet Nozzle Angles on Cross-Flow Suppression and Heat Transfer Enhancement of Swirl Chamber

Xiao

Feng

2022

J. Therm. Sci.

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Numerical investigation on the flow and heat transfer in swirl chambers with distributed multi exit slots and dimple/protrusion structure

Cited by 21 publications

References 27 publications

Nature-Inspired Structures Applied in Heat Transfer Enhancement and Drag Reduction

Nature-Inspired Structures Applied in Heat Transfer Enhancement and Drag Reduction

Numerical investigation on vortex cooling flow and heat transfer characteristics for gas turbine blade with variable coolant chamber cross-sectional shapes

Effects of Variable Jet Nozzle Angles on Cross-Flow Suppression and Heat Transfer Enhancement of Swirl Chamber

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