Parametric study on the effect of end walls on heat transfer and fluid flow across a micro pin-fin

Koz, Mustafa; Özdemir, Mehmed Rafet; Koşar, Ali

doi:10.1016/j.ijthermalsci.2010.12.008

Cited by 35 publications

(9 citation statements)

References 22 publications

(20 reference statements)

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“…For this purpose, water flow in the microchannel having different micro pin-fin configurations is simulated for Reynolds numbers between 20 and 120, which is a limited range for restricting wake to pin-fin interactions among pin-fins corresponding to a potential multi pin-fin configuration. This range also matches with Reynolds number ranges in the literature and is chosen along lines similar to Koz et al [33]. Accordingly, streamlines around the modeled micro pin-fins are obtained and are utilized to enrich the discussion about the performances obtained from different micro pin-fin configurations.…”

Section: Introductionmentioning

confidence: 95%

“…The length of the cone shaped fins (L fin ) is 290 μm, while the length of the hydrofoil shaped chord length and rectangular pinfins are 500 μm. The dimensions were selected according to the dimensions of micro pin-fin configurations in the literature [33].…”

Section: Drawingmentioning

confidence: 99%

“…Taking the change in thermophysical properties into consideration, the flow inside the microchannel is modeled using weakly compressible Navier-Stokes equations [33]. Accordingly, the thermophysical properties of water such as mass density (ρ) and dynamic viscosity (μ) are all subjected to the change with temperature.…”

Section: Fluid Flowmentioning

confidence: 99%

“…Water is assumed to stay in liquid form, and viscous heating is neglected. Substrate material is defined as silicon with its default properties in accordance with the study of Koz et al [33].…”

Section: Heat Transfermentioning

confidence: 99%

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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

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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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Section: Introductionmentioning

confidence: 95%

Section: Drawingmentioning

confidence: 99%

Section: Fluid Flowmentioning

confidence: 99%

Section: Heat Transfermentioning

confidence: 99%

See 2 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

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105

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“…Accordingly, the heat sinks can be classified as single-phase or two-phase. A growing number of studies have been carried out in recent years on thermofluid characteristics of single-phase flow [2][3][4][5][6][7][8][9][10][11][12][13][14] and flow boiling [15][16][17][18][19][20][21] in micro-pin-fin arrays with the goal of providing fundamental knowledge and accurate predictive tools that are essential to the design and implementation of this novel type of heat sink.…”

Section: Introductionmentioning

confidence: 99%

Pressure drop of water flow across a micro-pin–fin array part 1: Isothermal liquid single-phase flow

Mita

2015

International Journal of Heat and Mass Transfer

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a b s t r a c tThis is part one of a two-part study that investigates water single-phase and two-phase pressure drop across a staggered array of circular micro-pin-fins. This paper presents results of isothermal liquid single-phase flow, and part two adiabatic liquid-vapor two-phase flow. The micro-pin-fins are 180 lm in diameter, 683 lm in height, and 399 lm in both longitudinal and transverse pitches. Seven temperature levels from 23 to 80°C, and seventeen maximum mass velocities for each temperature, ranging from 133 to 1538 kg/m 2 s, were tested. The resulting Reynolds number ranged from 26 to 776. Pressure drop across the micro-pin-fin array was measured, and friction factor calculated. The existing friction factor correlations for micro-pin-fin arrays, conventional-size pin-fin arrays, and tube banks were examined and found unable to predict the data. A numerical simulation was performed, and a good agreement was found between the experimental data and numerical results. A new friction factor correlation was developed that is used in part two of the study on calculating liquid-vapor two-phase pressure drop.

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Single- and Multiphase Flow for Electronic Cooling

Joshi¹,

Wan²

2018

Handbook of Thermal Science and Engineering

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Parametric study on the effect of end walls on heat transfer and fluid flow across a micro pin-fin

Cited by 35 publications

References 22 publications

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

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

Pressure drop of water flow across a micro-pin–fin array part 1: Isothermal liquid single-phase flow

Single- and Multiphase Flow for Electronic Cooling

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