Optimal thermal design of microchannel heat sinks with different geometric configurations

Hung, Tu-Chieh; Sheu, Tsung‐Sheng; Yan, Wei‐Mon

doi:10.1016/j.icheatmasstransfer.2012.10.008

Cited by 50 publications

(10 citation statements)

References 20 publications

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“…Researchers in the past few decades worked to enhance the thermal characteristics of the MCHS designs by employing various techniques such as altering the channel geometry, introducing different working fluids, and changing the flow behaviour [6][7][8][9][10][11][12][13][14][15]. Many employed experimental methods to enhance thermal characteristics, such as Reyes et al, who experimentally studied thermal enhancement and pressure drop in conventional MCHS with tip clearance and compared the results with those of a reference geometry having conventional rectangular characteristics [6].…”

Section: Introductionmentioning

confidence: 99%

“…However, owing to the high cost of experimental investigation, researchers are employing computational methods to analyse flow in various configurations in MCHS. For instance, Hung et al developed three-dimensional models of MCHS, optimising the geometry to reduce the total thermal resistance of the device, for differently layered geometrical configurations [7]. Various geometric parameters, such as channel count, width, aspect ratio, and tapered ratios, were varied in their study.…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal Investigation of a Microchannel Heat Sink Using Secondary Flows in Trapezoidal and Parallel Orientations

Memon¹,

Cheema²,

Kim³

et al. 2020

Energies

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Thermal performance enhancement in microchannel heat sinks has recently become a challenge due to advancements in modern microelectronics, which demand compatibility with heat sinks able to dissipate ever-increasing amounts of heat. Recent advancements in manufacturing techniques, such as additive manufacturing, have made the modification of the microchannel heat sink geometry possible well beyond the conventional rectangular model to improve the cooling capacity of these devices. One such modification in microchannel geometry includes the introduction of secondary flow channels in the walls between adjacent mainstream microchannels. The present study computationally models secondary flow channels in regular trapezoidal and parallel orientations for fluid circulation through the microchannel walls in a heat sink design. The heat sink is made of silicon wafer, and water is used as the circulating fluid in this study. Continuity, momentum, and energy equations are solved for the fluid flow through the regular trapezoidal secondary flow and parallel secondary flow designs in the heat sink with I-type, C-type, and Z-type inlet–outlet configurations. Plots of velocity contours show that I-type geometry creates optimal flow disruption in the heat sink. Therefore, for this design, the pressure drop and base plate temperatures are plotted for a volumetric flow rate range, and corresponding contour plots are obtained. The results are compared with corresponding trends for the conventional rectangular microchannel design, and associated trends are explained. The study suggests that the flow phenomena such as flow impingement onto the microchannel walls and formation of vortices inside the secondary flow passages coupled with an increase in heat transfer area due to secondary flow passages may significantly improve the heat sink performance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrothermal Investigation of a Microchannel Heat Sink Using Secondary Flows in Trapezoidal and Parallel Orientations

Memon¹,

Cheema²,

Kim³

et al. 2020

Energies

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show abstract

“…(7) is not necessarily the same as the _ m in Eq. (16). For clarity, we compare the two arrays in terms of pressure drop, not flow resistances.…”

Section: Square Array or Triangular Array?mentioning

confidence: 99%

“…Several studies have demonstrated the effect of the wetted perimeter shape on the flow performance [7][8][9][10][11][12][13][14]. Additionally, the longitudinal configuration of the flow channel such as zigzag, curvy, step [15], single-layer, double-layer, tapered [16], wavy [17] and converting channels [18] for the same cross-sectional shape was investigated and compared with the conventional straight channel with uniform cross-sectional shape.…”

Section: Introductionmentioning

confidence: 99%

Arrays of flow channels with heat transfer embedded in conducting walls

Bejan

Almerbati

Lorente

et al. 2016

International Journal of Heat and Mass Transfer

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a b s t r a c tHere we illustrate the free search for the optimal geometry of flow channel cross-sections that meet two objectives simultaneously: reduced resistances to heat transfer and fluid flow. The element cross section and the wall material are fixed, while the shape of the fluid flow opening, or the wetted perimeter is free to vary. Two element cross sections are considered, square and equilateral triangular. We find that the two objectives are best met when the solid wall thickness is uniform, i.e., when the wetted perimeters are square and triangular, respectively. We also consider arrays of square elements and triangular elements, on the basis of equal mass flow rate per unit of array cross sectional area. The conclusion is that the array of triangular elements meets the two objectives better than the array of square elements.

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“…Single layer micro-channel heat sinks have been the most extensively studied form, but stacked multi-layer micro-or mini-channel heat sinks may have significant advantages because they can offer a high thermal performance with tolerable pressure drop and low flow rates. Some studies on multi layer micro-and mini-channel heat sinks have been conducted [4][5][6][7][8][9][10][11][12]. They showed that the overall thermal resistance for a two layered micro-channel stack was 30 percent less than for the single layered micro-channel due to doubling of the heat transfer area, even though the dimensions of micro-channel were not optimized.…”

Section: Introductionmentioning

confidence: 99%

Optimal Thermal Design of a Stacked Mini-Channel Heat Sink Cooled by a Low Flow Rate Coolant

Pang

Wang

et al. 2013

Entropy

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Application requirements for avionics are often very strict. For example, the heat sinks of avionics need very good temperature uniformity, but the flow rate of coolant is very restricted. In addition, the use of micro-channels is not recommended due to the potential clogging issue. Considering these design requirements, we will discuss a multiple-objective optimal design method to obtain a good stacked mini-channel structure for avionics applications. In our thermal design, the design variables are the mini-channel geometry parameters. Temperature uniformity, entropy generation, max temperature of heat sink and pump work are chosen as the objective functions. A Multi Objective Genetic Algorithm (MOGA) and Fluent solver are used together to minimize multiple objective functions subject to constraints, and locate the Pareto front. By analyzing the multiple objective optimal results, we can draw the conclusion that the objective functions of T max and s g have same effect on the optimization, and the multiple optimal results are a set and not a single value. If mostly focusing on the temperature uniformity, we can recommend some optimal structures to design a stacked mini-channel heat sink.

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Optimal thermal design of microchannel heat sinks with different geometric configurations

Cited by 50 publications

References 20 publications

Hydrothermal Investigation of a Microchannel Heat Sink Using Secondary Flows in Trapezoidal and Parallel Orientations

Hydrothermal Investigation of a Microchannel Heat Sink Using Secondary Flows in Trapezoidal and Parallel Orientations

Arrays of flow channels with heat transfer embedded in conducting walls

Optimal Thermal Design of a Stacked Mini-Channel Heat Sink Cooled by a Low Flow Rate Coolant

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