Pitch and aspect ratio effects on single-phase heat transfer through microscale pin fin heat sinks

Rasouli, Erfan; Naderi, Cameron; Narayanan, Vinod

doi:10.1016/j.ijheatmasstransfer.2017.10.105

Cited by 58 publications

(5 citation statements)

References 17 publications

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“…The friction factor (f) was computed from the pressure drop values using Eq. ( 24) [40,41]. To validate the experimental pressure drop values, the calculated friction factor was compared with the values estimated using the model of Gunther and Shaw [42], presented with Eq.…”

Section: Validationmentioning

confidence: 99%

Hydrothermal performance of inline and staggered arrangements of airfoil shaped pin-fin heat sinks: A comparative study

Babar

Ali

et al. 2023

Thermal Science and Engineering Progress

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Section: Validationmentioning

confidence: 99%

Hydrothermal performance of inline and staggered arrangements of airfoil shaped pin-fin heat sinks: A comparative study

Babar

Ali

et al. 2023

Thermal Science and Engineering Progress

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“…However, no correlation models as rule of thumb are given to know in advance whether a configuration may or may not lead to vortex shedding for considered ranges, nor the full geometric dependence on the performance of quantities of interest. An exception is the study using arrays of fin pins in Reference [41], where a threshold criteria to predict which cases would lead to vortex shedding was provided based on the geometric variables (transversal and longitudinal pitch ratio and height aspect ratio), although for a constant Reynolds number.…”

Section: Characterisation Of the Micro Heat Exchangermentioning

confidence: 99%

“…Since the exact model is not known beforehand, some assumptions must be made. In the literature is very frequent to find terms using relations among power functions to account for non-linear interactions [ 25 , 41 , 44 , 45 ]. There are many works in the literature that explored empirical correlation models for the drag coefficient

of objects.…”

Section: Characterisation Of the Micro Heat Exchangermentioning

confidence: 99%

“…As

and

are strongly related, the same modelling assumptions can be applied to

, leading to the correlation model suggested in Equation ( 12 ). Other researchers applied a similar logic to model the pressure drop and/or friction factor in the presence of arrays of pillars, as seen in References [ 23 , 24 , 25 , 41 ]. In Equation ( 12 ) the Reynolds number

has been normalised with 100 to improve the numerical stability in the search of coefficients.…”

Section: Characterisation Of the Micro Heat Exchangermentioning

confidence: 99%

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Mechanical Characterisation and Analysis of a Passive Micro Heat Exchanger

Granados-Ortiz

Ortega-Casanova

2020

Micromachines

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Heat exchangers are widely used in many mechanical, electronic, and bioengineering applications at macro and microscale. Among these, the use of heat exchangers consisting of a single fluid passing through a set of geometries at different temperatures and two flows in T-shape channels have been extensively studied. However, the application of heat exchangers for thermal mixing over a geometry leading to vortex shedding has not been investigated. This numerical work aims to analyse and characterise a heat exchanger for microscale application, which consists of two laminar fluids at different temperature that impinge orthogonally onto a rectangular structure and generate vortex shedding mechanics that enhance thermal mixing. This work is novel in various aspects. This is the first work of its kind on heat transfer between two fluids (same fluid, different temperature) enhanced by vortex shedding mechanics. Additionally, this research fully characterise the underlying vortex mechanics by accounting all geometry and flow regime parameters (longitudinal aspect ratio, blockage ratio and Reynolds number), opposite to the existing works in the literature, which usually vary and analyse blockage ratio or longitudinal aspect ratio only. A relevant advantage of this heat exchanger is that represents a low-Reynolds passive device, not requiring additional energy nor moving elements to enhance thermal mixing. This allows its use especially at microscale, for instance in biomedical/biomechanical and microelectronic applications.

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“…As the pin-fin height increases, the pressure drop increases simultaneously, which can be explained by high flow mixing at high heights. Rasouli et al (2018) studied the diamond-shaped micro PFHS with various pitch and aspect ratio values. It is pointed out that vortex shedding appeared at some specific configurations and a specified pitch and aspect ratio range.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on thermo-hydraulic performance of micro pin-fin heat sink using hybrid pin-fins arrangement for electronic cooling devices

Bari

Targhi

Heyhat

2023

HFF

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Purpose This study aims to examine the effect of a combination of hybrid pin-fin patterns on a heat sink's performance using numerical techniques. Also, flow characteristics have been studied, such as secondary flow formation and flow-wall interaction. Design/methodology/approach In this study, the effect of hybrid arrangements of elliptical and hexagonal pin-fins with different distribution percentages on flow characteristics and performance evaluation criteria in laminar flow was investigated. Ansys-Fluent software solves the governing equations using the finite volume method. Also, the accuracy of obtained results was compared with the experimental results of other similar papers. Findings The results of this study highlighted that hybrid arrangements show higher overall performance than single pin-fin patterns. Among the hybrid arrangements, case 3 has the highest values of performance evaluation criteria, that is, 1.84 in Re = 900. The results revealed that, with the instantaneous change in the pattern from elliptic to hexagonal, the secondary flow increases in the cross-sectional area of the channels, and the maximum velocity in the cross-section of the channel increases. The important advantages of case 3 are its highest overall performance and a lower chip surface temperature of up to about 2% than other hybrid patterns. Originality/value Prior research has shown that in the single pin-fin pattern, the cooling power at the end of the heat sink decreases with increasing fluid temperature. Also, a review of previous studies showed that existing papers had not investigated hybrid pin-fin patterns by considering the effect of changing distribution percentages on overall performance, which is the aim of this paper.

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Pitch and aspect ratio effects on single-phase heat transfer through microscale pin fin heat sinks

Cited by 58 publications

References 17 publications

Hydrothermal performance of inline and staggered arrangements of airfoil shaped pin-fin heat sinks: A comparative study

Hydrothermal performance of inline and staggered arrangements of airfoil shaped pin-fin heat sinks: A comparative study

Mechanical Characterisation and Analysis of a Passive Micro Heat Exchanger

A numerical study on thermo-hydraulic performance of micro pin-fin heat sink using hybrid pin-fins arrangement for electronic cooling devices

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