Heat Transfer From Low Aspect Ratio Pin Fins

Lyall, M. Eric; Thrift, A. A.; Thole, Karen A.; Kohli, Atul

doi:10.1115/1.2812951

Cited by 53 publications

(22 citation statements)

References 15 publications

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“…Generally in pin fin arrays, friction factor is driven by the spanwise spacing of the pins because it dictates the blockage to the flow [2,6,8,9]. In fact, many correlations for friction factor in pin fin arrays omit any dependence on streamwise spacing and are a function of spanwise spacing, only.…”

Section: Resultsmentioning

confidence: 99%

“…More recently, Ostanek [7] developed correlations using Artificial Neural Networks that also took into account array geometry. Lyall et al [8] and Lawson et al [9] contributed discussions on Reynolds number effects on both the heat transfer and the pressure drop; an increase in Reynolds number generated higher heat transfer. Siw et al [10] investigated narrow pin fin channels, where wall effects were influential, and found much increased heat transfer performance when compared to a conventional, wide pin fin array.…”

Section: Literature Reviewmentioning

confidence: 99%

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Pressure loss and heat transfer performance for additively and conventionally manufactured pin fin arrays

Kirsch

Thole

2017

International Journal of Heat and Mass Transfer

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Pin fin heat exchangers represent a common, viable means of keeping components cool and are widely used for electronics cooling and turbine airfoil cooling. Advancements in manufacturing technology will allow these heat exchangers to be built using new methods, such as laser powder bed fusion, a form of additive manufacturing. New manufacturing approaches, however, render a direct comparison between newly and conventionally manufactured parts meaningless without a good understanding of the difference in the performance. This research study investigated microchannel pin fin arrays that were manufactured using Laser Powder Bed Fusion and compared them to studies of pin fin arrays from the literature, which are representative of traditionallymanufactured pin fin arrays, where the pin and endwall surfaces exhibited much lower surface roughness. Pin fin arrays with four different spacings were manufactured and tested over a range of Reynolds numbers; pressure loss and heat transfer measurements were taken. Additionally, the test coupons were evaluated nondestructively and the asbuilt geometric features were analyzed. Measured surface roughness was found to be extremely high in each one of the microchannel pin fin arrays and was found to be a function of the pin spacing in the array, as was the shape of the pin itself; with more pins in the array came higher surface roughness and more distorted pin shapes. Comparisons between the smooth pin fin arrays from literature and the rough pin fin arrays from the current study showed that the high surface roughness more strongly affected the friction factor augmentation than it did the heat transfer augmentation relative to the smooth pin fin arrays.

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Section: Resultsmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Pressure loss and heat transfer performance for additively and conventionally manufactured pin fin arrays

Kirsch

Thole

2017

International Journal of Heat and Mass Transfer

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“…VanFossen and associates [8][9][10] also investigated the effects of changing pin spacing but reported as well on the effects of varying H/D. Lyall et al [11] examined a single row of pin fins with a constant H/D while varying spanwise spacing and Reynolds number. Lawson et al [12] elaborated on this study performed by Lyall et al to include multiple rows of pin fins.…”

Section: Previous Studiesmentioning

confidence: 99%

Heat Transfer Measurements of Oblong Pins

Kirsch

Thole

2015

Journal of Turbomachinery

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Pin fin arrays are employed as an effective means for heat transfer enhancement in the internal passages of a gas turbine blade, specifically in the blade's trailing edge. Various shapes of the pin itself have been used in such arrays. In this study, oblong pin fins are investigated whereby their long axis is perpendicular to the flow direction. Heat transfer measurements were taken at the pin midspan with unheated endwalls to isolate the pin heat transfer. Results show important differences in the heat transfer patterns between a pin in the first row and a pin in the third row. In the third row, wider spanwise spacing allows for two peaks in heat transfer over the pin surface. Additionally, closer streamwise spacing leads to consistently higher heat transfer for the same spanwise spacing. Due to the blunt orientation of the pins, the peak in heat transfer occurs off the stagnation point.

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“…Secondary cooling flow passages are built into each blade ( Figure 1) and consist of turbulators, film cooling holes, tube bundles, and pins. These are mostly used in the narrow trailing edge region of the blade [7].…”

Section: Problem Description and Motivationmentioning

confidence: 99%

A hybrid collocation/Galerkin scheme for convective heat transfer problems with stochastic boundary conditions

Constantine

Doostan

Iaccarino

2009

Numerical Meth Engineering

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SUMMARYWe present a numerical method to study convective heat transfer in a high Reynolds number incompressible flow around a cylinder subject to uncertain boundary conditions. We exploit the one-way coupling of the energy and momentum transport to derive a semi-intrusive uncertainty propagation scheme, which combines Galerkin and collocation approaches for computing approximate statistics of the stochastic temperature field. The hybrid scheme converges rapidly and dramatically reduces the overall computational cost compared with the conventional uncertainty propagation schemes.

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Heat Transfer From Low Aspect Ratio Pin Fins

Cited by 53 publications

References 15 publications

Pressure loss and heat transfer performance for additively and conventionally manufactured pin fin arrays

Pressure loss and heat transfer performance for additively and conventionally manufactured pin fin arrays

Heat Transfer Measurements of Oblong Pins

A hybrid collocation/Galerkin scheme for convective heat transfer problems with stochastic boundary conditions

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