Optimization of Microstructured Fins in Minichannels

Tullius, Jami F.; Tullius, Toni K.; Bayazıtoğlu, Yıldız

doi:10.1615/ichmt.2011.tmnn-2011.410

Cited by 3 publications

(4 citation statements)

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“…The Reynolds number (Re) of the flow across the pin-fins usually does not exceed 1000. Previous studies analyzed pin-fin heat sinks of various pin-fin geometries, such as circular [12][13][14][15][16][17][18][19][20], cone-shaped [16], diamond-shaped [13,[19][20][21], hydrofoil-shaped [16,22], square [7][8][9][10][11][19][20], triangle [19][20], and rectangular [2,4,18] pin-fins. While some of the studies were conducted with pin-fin configurations of sizes on the order of millimeters [1,2,8], the rest dealt with pinfin configurations of sizes on the order of micrometers [3-7, 9-11, 16, 19, 20].…”

Section: Introductionmentioning

confidence: 99%

“…The current literature covers hydrodynamic and thermal characteristics of micro pin-fin heat sinks and gives valuable information about this subject [12][13][14][15][16][17][18][19][20][23][24][25][26][27][28]. The study of Peles et al [12] emphasized that very low thermal resistances could be achieved by using micro pin-fin heat sinks.…”

Section: Introductionmentioning

confidence: 99%

“…total entropy generation, whereas circular pin-fins have the best performance for low Re, small dimensions, and high aspect ratios. None of the studies cover a certain pin-fin shape rather than a collection of micro pin-fin shapes except the studies of Koşar and Peles [16] and Tullius et al [19,20]. Koşar and Peles [16] compared the hydrodynamic and thermal performances of micro pin-fin heat sinks having circular, rectangular, hydrofoil, and cone-shaped micro pin-fins.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, 2CLD (circular less dense) pin-fins have the best hydrodynamic performance at low Re values (Re < 50), whereas hydrofoil pin-fins were the best choice for Re values above 50. Tullius et al [19,20] compared the thermal performances of micro pin-fin heat sinks having circle, square, triangle, ellipse, diamond-shaped, and hexagon-shaped micro pin-fins in a staggered array, where these are attached to the bottom heated surface of a rectangular minichannel. Effects of fin height, width, spacing, and material are investigated, and the best performance is observed with triangular pin-fins with larger fin height and smaller fin width.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Effect of Micro Pin-Fin Shape on Thermal and Hydraulic Performance of Micro Pin-Fin Heat Sinks

İzci

Koz

Koşar

2015

Heat Transfer Engineering

105

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Single micro pin-fin configurations having the same chord thickness/diameter but different shapes are numerically modeled to assess their heat transfer and hydraulic performances for Reynolds number values changing between 20 and 120. The configurations are three-dimensionally modeled based, and their heat transfer performances are evaluated using commercially available software COMSOL Multiphysics 3.5a. Navier-Stokes equations and continuity and energy equations are solved under steady-state conditions for single-phase water flows. To increase the computational efficiency, half of the domain consisting of a micro pin-fin located inside a microchannel is modeled using a symmetry plane. To validate the model, experimental data available in the literature are compared to simulation results obtained from the model of the same geometrical configuration as the experimental one. Accordingly, the numerical and experimental results show good agreement. Furthermore, performance evaluation study is performed using three-dimensional (3D) numerical models in the light of flow morphologies around micro pin-fins of various shapes. According to the results obtained from this study, the rectangular-shaped micro pin-fin configuration has the highest Nusselt number and friction factor over the whole Reynolds number range. However, the cone-shaped micro pin-fin configuration has the best thermal performance index, indicating that it could be more preferable to use micro pin-fins of unconventional shapes in micro pin-fin heat sinks.

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