Convergence angle and dimple shape effects on the heat transfer characteristics in a rotating dimple-pin fin wedge duct

Luo, Lei; Yan, Han; Yang, Shaoyun; Du, Wei; Wang, Songtao; Sundén, Bengt; Zhang, Xinghong

doi:10.1080/10407782.2018.1543920

Cited by 14 publications

(6 citation statements)

References 42 publications

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“…Based on the above discussion, realizable k-ε turbulent model shows the best agreement with experimental results under both stationary and rotating conditions. In addition, previous studies (Du et al , 2019; Luo et al , 2018; Yan et al , 2021) also acknowledged that realizable k-ε turbulent model shows the better ability of accurately capturing and evaluating the heat transfer enhancement and friction loss of pin fin-dimpled channels. Thus, realizable k-ε turbulent model combined with enhanced wall function is chosen.…”

Section: Computational Methods and Proceduresmentioning

confidence: 96%

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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

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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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Section: Computational Methods and Proceduresmentioning

confidence: 96%

“…As shown in Figure 2, the endwalls, dimples and pin fins are applied with q = 1,000 W/m 2 wall heat flux (Du et al , 2019; Luo et al , 2018). All the walls are viewed as no-slip wall.…”

Section: Computational Methods and Proceduresmentioning

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

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Self Cite

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“…However, the temperature of the superheated steam leaving the pressure reducing valve should be reduced. In order to augment the heat transfer efficiency, scholars have proposed many novel high-efficiency heat transfer devices like spirally corrugated tube [6][7][8], dimpled surfaces [9][10][11], and inserted tubes/microtubes [12,13]. Furthermore, many investigators aimed at conducting research on the cooling of superheated steam.…”

Section: Introductionmentioning

confidence: 99%

A numerical study of heat transfer effects and aerodynamic noise reduction in superheated steam flow passing a temperature and pressure regulation valve

Qian

Chen

Jin

et al. 2020

Numerical Heat Transfer, Part A: Applications

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Steam is a common medium in thermal engineering. When it flows through a throttling element, the aerodynamic noise may occur due to the disturbance. In this investigation, superheated steam flowing through a Venturi tube, one of the main parts in a temperature and pressure regulation valve, at different thermal conditions is studied to analyze to effects of heat transfer on the acoustic power. With a high temperature and a low pressure, the superheated steam is treated as ideal gas. The flow velocity is high, so the k-epsilon turbulent model is used, with the compressible steam. The results show that under the adiabatic condition, the acoustic power mainly influenced by the turbulent characteristics, such as the dissipation rate and the turbulent kinetic energy. Comparing the acoustic power levels at different thermal conditions, it is found that a lower temperature results to a lower acoustic power.

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“…The characteristics of heat transfer and flow resistance for five types of LVGs were studied numerically at the Reynolds number range of Re ¼ 8,900-29,900 by Xu et al [25]. Luo et al [26] numerically studied the effects of convergence angles and dimple shapes on flow structure and heat transfer characteristics in a rotating dimple-pin fin wedge duct. The results indicated that the spanwise-elliptical dimple shape offered the best heat transfer augmentation as it generated the strongest vortex structure and turbulent kinetic energy in the dimples, and larger convergence angles exhibited larger Nusselt numbers and better heat transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

Parametric study and optimization on heat transfer and flow characteristics in a rectangular channel with longitudinal vortex generators

Tang

Pan

Sundén

2019

Numerical Heat Transfer, Part A: Applications

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In this study, effects of various geometrical parameters of a new winglet longitudinal vortex generator (LVG) on heat transfer and flow characteristics in a rectangular channel were investigated by a numerical method, and the influence of various parameters was analyzed. A comparative study of effects of elliptical pole parameters, the thickness, the length, the height, the attack angle, the transverse pitch and the longitudinal pitch of LVGs on heat transfer and pressure loss performance was conducted. The results showed that the intensity of heat transfer could be greatly increased by the increase of the length, the height, the attack angle and the transverse pitch of LVGs, accompanied with an increase of pressure drop. The Nusselt number decreased by increasing the longitudinal pitch of LVGs. The short axis and major axis of the elliptical poles and the thickness of LVGs had a small influence on the average heat transfer coefficient and average friction factor at the present condition. The design parameters of this configuration were optimized by the Taguchi method. Sixteen kinds of models were made by compounding levels on each factor, and heat transfer and flow characteristics of each model were analyzed. The results allowed us to quantitatively estimate the various parameters affecting heat transfer performance, and the main factors for optimal design of a rectangular channel with LVGs were selected. The optimal condition was also acquired by two analytical results.

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Convergence angle and dimple shape effects on the heat transfer characteristics in a rotating dimple-pin fin wedge duct

Cited by 14 publications

References 42 publications

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

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

A numerical study of heat transfer effects and aerodynamic noise reduction in superheated steam flow passing a temperature and pressure regulation valve

Parametric study and optimization on heat transfer and flow characteristics in a rectangular channel with longitudinal vortex generators

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