The effect of the cross-sectional geometry on saturated flow boiling heat transfer in horizontal micro-scale channels

Sempértegui-Tapia, Daniel Felipe; Ribatski, Gherhardt

doi:10.1016/j.expthermflusci.2017.08.001

Cited by 20 publications

(4 citation statements)

References 30 publications

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“…Visualization results showed that corners were effective active nucleation sites and played an important role in heat transfer characteristics, contributing to the better performance of square microchannel than that of circular microtube. Daniel et al [20] conducted flow boiling experiments in circular, square and triangular microchannels with the same perimeter. For high heat flux, the HTC in the triangular microchannel is higher than that of conventional circular and square microchannels.…”

Section: Tablementioning

confidence: 99%

“…Ebadian [4] also pointed out the significant influence of refrigerants on the cooling efficiency of a heat sink. Currently, the refrigerants applied in the microchannel flow boiling research can be roughly sorted into two categories: (1) water [16,17,22] and (2) fluorides, such as R134a [20,[23][24][25], FC-72 [21,33,34], HCFC123 [19], HFE-7100 [35,36], and R246fa [37,38]. Water is an ideal refrigerant with a large latent heat, but it is restricted by a narrow operating temperature range.…”

Section: Tablementioning

confidence: 99%

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A diamond made microchannel heat sink for high-density heat flux dissipation

Yang

Zhao

Huang

et al. 2019

Applied Thermal Engineering

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Flow boiling in microchannels is a promising technique for cooling high power-density electronic devices. In this study, a microchannel heat sink using ammonia as working fluid is developed, and its cooling efficiency is experimentally investigated under nonuniform high-density heat flux, which well simulates a practical heat dissipation scenario for microthermal systems. Diamond with high thermal conductivity of 1500 W/mK is selected as the microchannel heat sink material. A total of 37 parallel triangular microchannels with aspect ratio of 5, channel length of 45 mm and hydraulic diameter of 280 μm are uniformly engineered on the diamond film by laser ablation processing. The significance of diamond substrate as a heat spreader to minimize the nonuniformity of heat flux imposed by a central hotspot is verified. The influences of heat flux and mass flux on the cooling efficiency are experimentally investigated. An optimal range of outlet vapor quality from 0.10 to 0.13 is found, within which the minimum heat source temperature can be achieved. Notably, the microchannel heat sink is capable of managing a central hotspot with heat flux of 267 W/cm 2 while maintaining the heat source temperature at 53.3 °C for a mass flux of 320kg/m 2 s.

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Section: Tablementioning

confidence: 99%

Section: Tablementioning

confidence: 99%

A diamond made microchannel heat sink for high-density heat flux dissipation

Yang

Zhao

Huang

et al. 2019

Applied Thermal Engineering

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“…The phase change which accompanying boiling processes allows the highest possible heat fluxes to be obtained at low temperature differences between the heated surface and the working fluid over a small heat transfer area. Scientific studies on heat transfer in cooling liquids flowing through a group of channels of small hydraulic diameters are being conducted intensively [1][2][3][4][5][6][7][8][9]. This topic is not popular in research mainly due to practical difficulties.…”

Section: Introductionmentioning

confidence: 99%

Numerical calculations of heat transfer during FC-72 flow in minichannels performed with ANSYS software

2022

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The main aim of the paper was to apply numerical calculations in ANSYS software to solve problems related to steady-state convective heat transfer during FC-72 flow in a minichannel heat sink. A mathematical model of fluid flow in a minichannel heat sink was proposed. Data from research conducted on the experimental stand with asymmetrically heated test section were selected. The element cooled by fluid flowing in minichannels was a thin foil. The distribution of temperature on the outer heated foil surface was measured using infrared thermography. Thermocouples and pressure meters were installed at the inlet and outlet of the minichannels. A CAD model was prepared with respect to the geometry of the test section. The mesh was created in ANSYS Mesher. A suitable model of turbulences was selected and materials temperature dependencies were considered. The iterative process of creating the model and comparing the results obtained by the CFD calculation was used to capture the fluid behavior. The velocity magnitudes and temperature distributions were presented as the main results of numerical calculations.

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“…For example, many achievements have been made in material technology and its application, such as manufacture of textile materials (Endruweit et al., 2018), structural design of laminated composites (An et al., 2017), mechanical properties of functionally graded materials (Kolakowski and Mania, 2017; Kolakowski and Teter, 2015), mechanical properties and application of foam (Abedi et al., 2012; Li et al., 2006) and metal materials (Fan et al., 2013; Huang et al., 2017; Marmo and Rosati, 2015; Yamashita et al., 2003; Zhu and Francois, 2014) and physical and mechanical properties of fibres (Koc et al., 2012). In addition, cross-sectional shape affects heat transfer performance and associated energy dissipation (Col et al., 2011; Sempertegui-Tapia and Ribatski, 2017; Tunvir et al., 2012) as well as the flow of liquids and gases (Ajdari et al., 2006; Burger et al., 2010; Erdogan and Worner, 2013; Sahu et al., 2013; Steckelmacher, 1978). As mentioned above, the influence of cross-section shape can never be ignored.…”

Section: Introductionmentioning

confidence: 99%

The effect of cross-section shape on deformation, damage and failure of rock-like materials under uniaxial compression from both a macro and micro viewpoint

Zhang

Lin

Qiu

et al. 2020

International Journal of Damage Mechanics

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The mechanical properties of rock-like materials always attract the interest of many researchers. In this paper, we study the influence of specimen cross-section shape on uniaxial compressive strength as well as their deformation, damage and failure characteristics by uniaxial compression tests. The diameter and height of circular cross-section specimens are 50 and 100 mm, respectively, and the height and cross-sectional area of other specimens are equal to that of circular cross-sectional ones. Simulation and experimental results show that the cross-sectional shape has little effect on uniaxial compressive strength. Moreover, the effect on other mechanical properties is also very limited before the peak strength, such as stress–strain curve, rotation and motion of particles, contact damage and energy evolution of particles; however, it gradually becomes obvious after the peak strength. This is a very important feature, which affects the macroscopic form of failure of specimens and reflects the difference between failure surfaces. The shapes of failure surfaces obtained from numerical simulations are quite similar to the experimental results, which verify the reliability of numerical simulation results. Finally, the achievements can serve as a reference for related engineering issues.

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The effect of the cross-sectional geometry on saturated flow boiling heat transfer in horizontal micro-scale channels

Cited by 20 publications

References 30 publications

A diamond made microchannel heat sink for high-density heat flux dissipation

A diamond made microchannel heat sink for high-density heat flux dissipation

Numerical calculations of heat transfer during FC-72 flow in minichannels performed with ANSYS software

The effect of cross-section shape on deformation, damage and failure of rock-like materials under uniaxial compression from both a macro and micro viewpoint

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