Convective mass transfer and pressure loss characteristics of staggered short pin-fin arrays

Goldstein, R. J.; Jabbari, Masoud; Chen, S.B.

doi:10.1016/0017-9310(94)90018-3

Cited by 52 publications

(16 citation statements)

References 11 publications

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“…They determined that the short pin "ns performed a better overall heat transfer than long pin "ns. There are some studies on heat and mass transfer from the surfaces with cylindrical "ns using naphthalene sublimation technique (Goldstein et al, 1994;Sunk et al, 1996), and with cylindrical ice "ns Intemann and Kazmierczak, 1997). Other experimental, numerical and analytical studies on optimal spacing of "ns were also performed (Bejan and Morega, 1993;Bejan, 1995;Stanescu et al, 1996;Yeh, 1997).…”

Section: Introductionmentioning

confidence: 97%

Thermal performance analysis of a tube finned surface

Bilen

Akyol

Yapıcı

2002

Int. J. Energy Res.

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SUMMARYThe present work submits an experimental work on the heat transfer and friction loss characteristic, employing a tube "nned heating surface kept at a constant temperature in a rectangular channel. The tube "ns attached on the surface (o.d."29 mm) were arranged as either in-line or staggered. The parameters for the study were Reynolds number (3700}30 000), depending on hydraulic diameter, the distance between the tube "ns in the #ow direction (S W /D"1.72}3.45) and the "n arrangement. The change in the Nusselt number with these parameters was determined. For both tube "n arrangements, it was observed that increasing Reynolds number increased Nusselt number, and maximum heat transfer occurred at S W /D"2.59. Thermal performances for both arrangements were also determined and compared with respect to heat transfer from the same surface without "ns. With staggered array, a heat transfer enhancement up to 25 per cent for

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Section: Introductionmentioning

confidence: 97%

Thermal performance analysis of a tube finned surface

Bilen

Akyol

Yapıcı

2002

Int. J. Energy Res.

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“…This means that better cooling performance can be obtained by adding to or otherwise modifying the geometry of an internal passage. Certain geometric features, such as ribs [1,2], pin-fins [3][4][5], protrusions and dimples [6,7], have been investigated as heat transfer intensifiers. In particular, various types of rib configurations have been studied, due to their simplicity and usefulness [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Augmented heat transfer with intersecting rib in rectangular channels having different aspect ratios

Chung

Park

et al. 2015

International Journal of Heat and Mass Transfer

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“…Chyu et al [21] reported that the pin-fin heat transfer is 10% to 20% higher than the endwall heat transfer. Goldstein et al [22] found that the stepped-diameter circular pin-fin array provides a higher mass transfer coefficient and a smaller pressure loss than a uniform-diameter circular pin-fin array. Recent investigations can be found in [23][24][25][26][27].…”

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confidence: 98%

Enhanced Internal Heat Transfer on the Tip-Wall in a Rectangular Two-Pass Channel (AR = 1:2) by Pin-Fin Arrays

Xie

Sundén

Wang

et al. 2009

Numerical Heat Transfer, Part A: Applications

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To improve gas turbine performance, the operating temperature has been increased continuously. However, the heat transferred to the turbine blade is substantially increased as the turbine inlet temperature is increased. Cooling methods are therefore much needed for the turbine blades to ensure a long durability and safe operation. The blade tip region is exposed to the hot gas flows and is difficult to cool. A common way to cool the tip is to use serpentine passages with a 180 turn under the blade tip cap taking advantage of the three-dimensional turning effect and impingement. Increasing internal convective cooling is however required to increase the blade tip life. In this article, enhanced heat transfer of a blade tip has been investigated numerically. The computational models consist of a twopass channel with a 180 turn and arrays of pin-fins mounted on the tip-cap, and a smooth two-pass channel. Inlet Reynolds numbers range from 100,000 to 600,000. The computations are 3-D, steady, and incompressible. The detailed 3-D fluid flow and heat transfer over the tip surfaces are presented. The overall performance of the two models is evaluated. It is found that due to the combination of turning, impingement, and pin-fin crossflow the heat transfer coefficient of the pin-finned tip might be a factor of 1.84 higher than that of a smooth tip. This augmentation is achieved at the expense of a penalty of pressure drop around 35%. It is suggested that the pin-fins could be used to enhance blade tip heat transfer and cooling.

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Convective mass transfer and pressure loss characteristics of staggered short pin-fin arrays

Cited by 52 publications

References 11 publications

Thermal performance analysis of a tube finned surface

Thermal performance analysis of a tube finned surface

Augmented heat transfer with intersecting rib in rectangular channels having different aspect ratios

Enhanced Internal Heat Transfer on the Tip-Wall in a Rectangular Two-Pass Channel (AR = 1:2) by Pin-Fin Arrays

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