Parametric study on thermal performance of microchannel heat sinks with internal vertical Y-shaped bifurcations

Xie, Gongnan; Shen, Han; Wang, Chi-Chuan

doi:10.1016/j.ijheatmasstransfer.2015.07.034

Cited by 99 publications

(29 citation statements)

References 34 publications

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“…Enhancing the thermal efficiency of heat exchangers is a challenging task to meet the heat removal capability needed for development of new devices with better performances. A number of designs and approaches have been proposed to passively enhance the heat transfer performance of cooling devices [1][2][3][4][5][6][7][8][9]. Equipping rectangular channels with vortex generators (VGs) has been demonstrated to be a promising method to passively augment the heat transfer performance [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Laminar convective heat transfer of shear-thinning liquids in rectangular channels with longitudinal vortex generators

Ebrahimi

Naranjani

Milani

et al. 2017

Chemical Engineering Science

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Heat and fluid flow in a rectangular channel heat sink equipped with longitudinal vortex generators have been numerically investigated in the range of Reynolds numbers between 25 and 200. Aqueous solutions of carboxymethyl cellulose (CMC) with different concentrations (200-2000 ppm), which are shear-thinning non-Newtonian liquids, have been utilised as working fluid. Three-dimensional simulations have been performed on a plain channel and a channel with five pairs of vortex generators. The channels have a hydraulic diameter of 8 mm and are heated by constant wall temperature. The vortex generators have been mounted at different angles of attack and locations inside the channel. The shear-thinning liquid flow in rectangular channels with longitudinal vortex generators are described and the mechanisms of heat transfer enhancement are discussed. The results demonstrate a heat transfer enhancement of 39-188% using CMC aqueous solutions in rectangular channels with LVGs with respect to a Newtonian liquid flow (i.e. water). Additionally, it is shown that equipping rectangular Page 2 of 40 channels with LVGs results in an enhancement of 24-135% in heat transfer performance visà-vis plain channel. However, this heat transfer enhancement is associated with larger pressure losses. For the range of parameters studied in this paper, increasing the CMC concentration, the angle of attack of vortex generators and their lateral distances leads to an increase in heat transfer performance. Additionally, heat transfer performance of rectangular channels with longitudinal vortex generators enhances with increasing the Reynolds number in the laminar flow regime.

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Section: Introductionmentioning

confidence: 99%

Laminar convective heat transfer of shear-thinning liquids in rectangular channels with longitudinal vortex generators

Ebrahimi

Naranjani

Milani

et al. 2017

Chemical Engineering Science

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“…They concluded that at the same hydraulic diameter and pumping power, the thermal resistance of the circle MCHS was lower than that of the square MCHS. The thermal performance of MCHS with internal Y-shaped bifurcations was much better than that of the rectangular MCHS, as reported by Xie et al [12]. Although the high heat flux and small thermal resistance of SL-P-MCHS were proven in published literature, the nonuniform bottom-wall temperature and high pressure dropped on the channels of the SL-P-MCHSs were still barriers for wide application.…”

Section: Introductionmentioning

confidence: 66%

Enhancement thermodynamic performance of microchannel heat sink by using a novel multi-nozzle structure

Tran

Chang

Teng

et al. 2016

International Journal of Heat and Mass Transfer

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“…On the one hand, the nonuniform heat generating model can be processed back to the model mentioned in [46] in the condition of p = 0. On the other hand, when p = 10, k = 5000, φ = 0.01 and N = 100, ∆ T 0 is equal to 0.2764 by using the finite element method, and comparatively ∆ T 0 is equal to 0.2711 by using the analytical method in Equation (16). These preconditions mentioned above mainly meet the foundations of Equations (8), (12) and (21).…”

Section: Constant Cross-sectional Hccsmentioning

confidence: 83%

“…Invoking this law in the engineering field, one should bear in mind that this law is about the direction of evolution in time, and the design phenomenon is dynamic. Furthermore, the connotation of the time arrow design evolution has become the focus of concern by many researches and scholars [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Bejan [27] firstly conducted constructal optimization of a rectangular heat generating volume with the optimization objective of maximum temperature difference (MTD) and obtained the optimal distribution of constant high conductivity channels (HCCs).…”

Section: Introductionmentioning

confidence: 99%

Constructal Optimization for Cooling a Non-Uniform Heat Generating Radial-Pattern Disc by Conduction

You

Feng

Xie

2018

Entropy

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A heat conduction model in a radial-pattern disc by considering non-uniform heat generation (NUHG) is established in this paper. A series of high conductivity channels (HCCs) are attached on the rim of the disc and extended to its center. Constructal optimizations of the discs with constant and variable cross-sectional HCCs are carried out, respectively, and their maximum temperature differences (MTDs) are minimized based on analytical method and finite element method. Besides, the influences of the NUHG coefficient, HCC number and width coefficient on the optimal results are studied. The results indicate that the deviation of the optimal constructs obtained from the analytical method and finite element method are comparatively slight. When the NUHG coefficient is equal to 10, the minimum MTD of the disc with 25 constant cross-sectional HCCs is specifically reduced by 48.8% compared to that with 10 HCCs. As a result, the heat conduction performance (HCP) of the disc can be efficiently improved by properly increasing the number of HCCs. The minimum MTD of the disc with variable cross-sectional HCC is decreased by 15.0% when the width coefficient is changed from 1 to 4. Therefore, the geometry of variable cross-sectional HCC can be applied in the constructal design of the disc to a better heat transfer performance. The constructal results obtained by investigating the non-uniform heat generating case in this paper can contribute to the design of practical electronic device to a better heat transfer performance.

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Parametric study on thermal performance of microchannel heat sinks with internal vertical Y-shaped bifurcations

Cited by 99 publications

References 34 publications

Laminar convective heat transfer of shear-thinning liquids in rectangular channels with longitudinal vortex generators

Laminar convective heat transfer of shear-thinning liquids in rectangular channels with longitudinal vortex generators

Enhancement thermodynamic performance of microchannel heat sink by using a novel multi-nozzle structure

Constructal Optimization for Cooling a Non-Uniform Heat Generating Radial-Pattern Disc by Conduction

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