Numerical and Experimental Investigation of Turning Flow Effects on Innovative Pin Fin Arrangements for Trailing Edge Cooling Configurations

Bianchini, Claudio; Facchini, Bruno; Simonetti, F.; Tarchi, Lorenzo; Zecchi, Stefano

doi:10.1115/1.4003230

Cited by 43 publications

(16 citation statements)

References 21 publications

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“…Liao et al [5] in their study on pin-fin arrangement, found that the Nusselt number decreases with increasing the ratio between lengths to diameter of pin-fins. Bianchini et al [6] investigated arrangement of pin fins with circular cross-section. Kelkar et al [7] investigated the staggered pins on parallel plates forming a channel.…”

Section: Introductionmentioning

confidence: 99%

Numerical study for heat transfer enhancement using CuO water nanofluids through mini-channel heat sinks for microprocessor cooling

et al. 2020

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Original scientific paper https://doi.org/10.2298/TSCI180722022AWater cooled heat sinks are becoming popular due to increased heat generation inside the microprocessor. Timely heat removal from microprocessor is the key factor for better performance and long life. Heat transfer enhancement is reached either by increasing the surface area density and/or by altering the base fluid properties. Nanoparticles emerge as a strong candidate to increase the thermal conductivity of base fluids. In this research, the thermal performance of mini-channel heat sinks for different fin spacing (0.2 mm, 0.5 mm, 1 mm, and 1.5 mm) was investigated numerically using CuO-water nanofluids with volumetric concentration of 1.5%. The numerical values computed were than compared with the literature and a close agreement is achieved. We recorded the minimum base temperature of chip to be 36.8 °C for 0.2 mm fin spacing heat sink. A reduction of 9.1% in base temperature was noticed using CuO-water nanofluids for 0.2 mm fin spacing as compared to previously experimental estimated value using water [1]. The drop percentage difference in pressure between water and CuO-water nanofluids was 2.2-13.1% for various fin spacing heat sinks. The percentage difference in thermal resistance between water and CuO-water nanofluids was computed 12.1% at maximum flow rate. We also observed uniform temperature distribution for all heat sinks.

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Section: Introductionmentioning

confidence: 99%

Numerical study for heat transfer enhancement using CuO water nanofluids through mini-channel heat sinks for microprocessor cooling

et al. 2020

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“…Metzger et al [2] and [3] experimentally studied the flow and heat transfer characteristics of a rectangular channel with short pin-fins at Reynolds number varying from 10,000 to 50,000, pin streamwise spacing ratio 1.32 to 2.5, and imposed empirical correlations between average array Nusselt number, pin fins spacing and Reynolds number. For the case where the trailing edge is convergent (wedge-shaped), most studies focused on the influence of the outlet of cold air [4], Reynolds number [4], the layout of pinfins [4][5][6], and the shape of pin-fins [7][8][9] on heat transfer and flow resistance.…”

Section: Introductionmentioning

confidence: 99%

Surface temperature reduction by using dimples/protrusions in a realistic turbine blade trailing edge

Qiu

et al. 2018

Numerical Heat Transfer, Part A: Applications

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In this article, numerical simulations have been conducted on the heat transfer effect of dimple/protrusion layouts of a pin-finned wedge duct. Conjugate heat transfer calculations are further performed to investigate the cooling effect of modified schemes with dimples and protrusions added. Comparisons are carried out with a turbine second stage guide vane employed as the prototype. The dimple/protrusion-pin fin arrangement is set as the optimum one obtained above, and dimple depth/protrusion height varies from 0.2 to 0.3 times the structure diameter. It is found that the side-by-side arrangement and protrusion structure is more beneficial for the wedge duct endwall heat transfer. Comparison with the prototype blade shows that the addition of both dimples and protrusions are helpful in enhancing the trailing edge cooling effect. The cooling effect is increased with an increase in dimple depth/protrusion height. The results also show that the modified blade with protrusions attached at 0.3 height saves 0.48 g/s cooling mass flow and reaches the most positive performance with a 17 K, 14 K average temperature reduction, 0.022, 0.018 cooling effect increasing for pressure, suction side, respectively.

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“…The flow becomes very complex, unsteady, and turbulent. A clear estimation of these phenomena is not easily obtained when using experimental measurement [1]. Furthermore, when considering turbines blades, the flow is subjected to rotation, strongly influencing streamlines and heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Unsteady CFD Analysis of Erosion Mechanism in the Coolant Channels of a Rotating Gas Turbine Blade

Borello

Anielli

Rispoli

et al. 2015

Volume 5A: Heat Transfer

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The two-phase flow in a rotating wedge mimicking the final portion of a blade turbine internal cooling channel is here presented and discussed focusing on unsteady motion and erosion mechanisms. The rotation axis is placed to properly reproduce a configuration with a very strong deviation (90°). The flow field was modelled by using the well known k-ε-ζ-f unsteady-RANS model based on the elliptic-relaxation concept. The model was modified by some of the authors to take into account the influence of turbulence anisotropy as well as rotation. The model was applied to the well-established and fully validated T-FlowS code. A systematic comparison of rotating and non-rotating case was carried out to show the influence of Coriolis force on flow and erosion mechanisms. The rotational effects strongly changed the flow behaviour within the channel, affecting both the unsteady flow and the particles trajectories. In the rotating case, there is no recirculation on the tip region; besides, position of the small recirculation regions above each pedestals change. These, and other minor effects, affect the particle motion thus resulting in a different erosion pattern.

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Numerical and Experimental Investigation of Turning Flow Effects on Innovative Pin Fin Arrangements for Trailing Edge Cooling Configurations

Cited by 43 publications

References 21 publications

Numerical study for heat transfer enhancement using CuO water nanofluids through mini-channel heat sinks for microprocessor cooling

Numerical study for heat transfer enhancement using CuO water nanofluids through mini-channel heat sinks for microprocessor cooling

Surface temperature reduction by using dimples/protrusions in a realistic turbine blade trailing edge

Unsteady CFD Analysis of Erosion Mechanism in the Coolant Channels of a Rotating Gas Turbine Blade

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