Influence of channel shape on the thermal and hydraulic performance of microchannel heat sink

Mohammed, Hussein A.; Gunnasegaran, Prem; Shuaib, N. H.

doi:10.1016/j.icheatmasstransfer.2010.12.031

Cited by 162 publications

(37 citation statements)

References 29 publications

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“…The installed location and accuracies of apparatuses are listed in Table 1 and Table 2, respectively. Condensing water temperature T 3 Inlet cooling water T 4 Outlet cooling water T 5 Ambient The square microchannel condenser has 10 microchannels the hydraulic diameter of D h = 500µm. The distance between two microchannels is 500 m.…”

Section: Experimental Methodsmentioning

confidence: 99%

The Effect of Cooling Water on Condensation of Microchannels

Doan¹,

Dang²

2017

IJERMT

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Abstractn this paper, the influences of cooling water on the performance of square microchannel condenser were studied experimentally. There are 10 square microchannels with the hydraulic diameter of D h = 500µm in the condenser. The experiments were carried out in both case of vertical microchannel condender and case of horizontal one. The ranges of parameters examined: mass flow rate of water and steam from 2 [g/s] to 3 [g/s] and from 0.02 [g/s] to 0.08 [g/s], respectively. When compared the data for vertical microchannels, the capacity and temperature fluctuation of cooling water for the horizontal microchannels are the same; however, the pressure drop of vertical microchannels is lower than horizontal microchanels and the performance index of vertical microchannels is higher than horizontal one. Besides, in the fixed conditions, the pressure drop of steam increases with the increasing of mass flow rate of water.Keywords-square microchannels condenser, mass flow rate of water, vertical microchannels, horizontal microchannels, cooling water. I. INTRODUCTIONHeat transfer and fluid flow phenomena of two phase flow in microchannels are interesting topics in recent years. Regarding to this fields, Sur and Liu [1] studied adiabatic air -water two-phase flow in circular microchannels. Four basic flow patterns (bubbly flow, slug flow, ring flow, and annular flow) were observed with inner diameters of 100, 180 and 324 µm. The effects of channel size and superficial phasic velocity on the two-phase flow pattern and pressure drop of air -water mixture were done experimentally. The results showed the flow pattern-based models which provide the best prediction of the two-phase pressure drop in the microchannels. Hasan et al.[2] studied in the effect of microchannel shapes on its performances for different channel cross-sections (circular, square, rectangular, iso-triangular and trapezoidal). The simulations (FVM-Finite Volume Method) showed that for the same volume of a heat exchanger, the circular channels give the best overall performance (thermal and hydraulic); however, the rectangular channels give lowest pressure drop. Mohammed et al. [3] investigated in the performances of differential channel shapes of microchannel heat sink -MCHS (Zigzag, step, straight, and wavy MCHS). They concluded that at the same cross-section of a MCHS, the heat transfer coefficient of the zigzag MCHS is the greatest. However, the zigzag MCHS has the highest value of pressure drop, friction factor, and wall shear stress. Chung and Kawaji [4] investigated in the effect of diameters on adiabatic two-phase flow characteristics in microchannels. The experiments were carried out with a mixture of nitrogen gas and water in circular channels with diameters of 530, 250, 100, and 50 m. In this paper, the gas and liquid flow rates were varied, the images of the two-phase flow patterns captured. Besides, they also examined the data of twophase friction pressure drop and void fraction. Park and Hrnjak [5] investigated in the effect of differential ty...

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Section: Experimental Methodsmentioning

confidence: 99%

The Effect of Cooling Water on Condensation of Microchannels

Doan¹,

Dang²

2017

IJERMT

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“…Results showed that the second step can be used as a control device for both heat transfer and fluid flow. Other researchers focus on experimental study on the effects of sudden contraction and expansion on characteristics of flow and heat transfer in turbulent condition [13,14].…”

Section: Literature Reviewmentioning

confidence: 99%

Simulation of heat transfer to separation Air flow in a concentric pipe

Oon

Al-Shamma’a

Kazi

et al. 2014

International Communications in Heat and Mass Transfer

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Simulation of heat transfer to separation Air flow in a concentric pipe http://researchonline.ljmu.ac.uk/id/eprint/364/ Article LJMU has developed LJMU Research Online for users to access the research output of the University more effectively. Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Users may download and/or print one copy of any article(s) in LJMU Research Online to facilitate their private study or for non-commercial research. You may not engage in further distribution of the material or use it for any profit-making activities or any commercial gain.The version presented here may differ from the published version or from the version of the record. Please see the repository URL above for details on accessing the published version and note that access may require a subscription.

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“…Heat sinks with rectangular [5,[7][8][9][10][11], trapezoidal [12][13][14], triangular [15] and circular microchannels [16][17][18] have been studied extensively, however a small number of experimental studies have demonstrated that other novel shapes, including U-shaped [19], wavy [20,21], tortuous [22,23] and serpentine [24] channels, can offer attractive performance advantages. A number of other channel shapes such as zigzag, curvy and step-shaped channels have been investigated numerically by Mohammed et al [25,26]. This showed that the heat transfer performance of these were superior to those of straight and wavy channels, with the zigzag channel having the highest friction factor and pressure drop penalty followed by the curvy and step-shaped channels.…”

Section: Introductionmentioning

confidence: 99%