Thermal management of electronic devices using carbon foam and PCM/nano-composite

Alshaer, W.G.; Nada, S.A.; Rady, Mohamed; Barrio, Elena Palomo del; Sommier, Alain

doi:10.1016/j.ijthermalsci.2014.10.012

Cited by 141 publications

(35 citation statements)

References 10 publications

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“…Heat transfer surface area is limited in miniature designs, therefore, they cannot be cooled down with natural or forced convection when working fluid is air. Therefore, the current literature focuses on heat transfer enhancement with phase changing materials or forced convection with water, oil or nano-fluids working fluids [3][4][5][6][7][8][9][10][11][12][13][14]. These methods are essential in order to increase the rate of heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of constructal vascular channels for self-cooling: Parallel channels, tree-shaped and hybrid designs

Yenigun

Çetkin

2016

International Journal of Heat and Mass Transfer

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a b s t r a c tIn this paper, we show experimentally and numerically how a plate which is subjected to a constant heat load can be kept under an allowable temperature limit. Vascular channels in which coolant fluid flows have been embedded in the plate. Three types of vascular channel designs were compared: parallel channels, tree-shaped and their hybrid. The effects of channel design on the thermal performance for different volume fractions (the fluid volume over the solid volume) are documented. In addition, the effects of the number of channels on cooling performance have been documented. Changing the design from parallel channels to tree-shaped designs decreases the order of pressure drop. Hence increase in the order of the convective heat transfer coefficient is achieved. However, tree-shaped designs do not bathe the entire domain, which increases the conductive resistances. Therefore, additional channels were inserted at the uncooled regions in the tree-shaped design (hybrid design). The best features of both parallel channels and tree-shaped designs are combined in the hybrid of them: the flow resistances to the fluid and heat flow become almost as low as the tree-shaped and parallel channels designs, respectively. The effect of design on the maximum temperature shows that there should be an optimum design for a distinct set of boundary conditions, and this design should be varied as the boundary conditions change. This result is in accord with the constructal law, i.e. the shape should be varied in order to minimize resistances to the flows.

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of constructal vascular channels for self-cooling: Parallel channels, tree-shaped and hybrid designs

Yenigun

Çetkin

2016

International Journal of Heat and Mass Transfer

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“…HR-TEM was equipped with selected-area electron diffraction (SAED). The crystalline phase identification of the samples was carried out by X-ray diffraction (XRD, X'pert 3 Powder, PANalytical Co., Almelo, The Netherlands). The diffraction data were collected in the range of 30-80 • with a scan speed of 2 • /s using Cu-Kα radiation (wavelength = 1.54056 Å).…”

Section: Characterizationmentioning

confidence: 99%

“…In order to avoid the malfunction of electronic devices, composites materials used in these devices should have high thermal conductivity and electrical insulator properties. Normally, high thermal conductive performance has been obtained by adding fillers due to the thermal conductive chains or networks produced by the fillers [1][2][3][4][5]. In order to improve the thermal conductivity of composites, various inorganic ceramic fillers with high thermal conductivity have been introduced into insulation composites; notable example include silicon nitride (SiN) [6][7][8], silicon carbide (SiC) [9], boron nitride (BN) [10,11], alumina oxide (Al 2 O 3 ) [12][13][14], and alumina nitride (AlN) [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Studies on Preparation and Characterization of Aluminum Nitride-Coated Carbon Fibers and Thermal Conductivity of Epoxy Matrix Composites

Kim

Lee

Chung³

et al. 2017

Coatings

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Abstract:In this work; the effects of an aluminum nitride (AlN) ceramic coating on the thermal conductivity of carbon fiber-reinforced composites were studied. AlN were synthesized by a wet-thermal treatment (WTT) method in the presence of copper catalysts. The WTT method was carried out in a horizontal tube furnace at above 1500 • C under an ammonia (NH 3 ) gas atmosphere balanced by a nitrogen using aluminum chloride as a precursor. Copper catalysts pre-doped enhance the interfacial bonding of the AlN with the carbon fiber surfaces. They also help to introduce AlN bonds by interrupting aluminum oxide (Al 2 O 3 ) formation in combination with oxygen. Scanning electron microscopy (SEM); Transmission electron microscopy (TEM); and X-ray diffraction (XRD) were used to analyze the carbon fiber surfaces and structures at each step (copper-coating step and AlN formation step). In conclusion; we have demonstrated a synthesis route for preparing an AlN coating on the carbon fiber surfaces in the presence of a metallic catalyst.

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“…The heat transfer surface area cannot be increased in miniature designs. Therefore, the current literature focuses on heat transfer enhancement with nanofluids and phase change [1][2][3][4]. These methods are essential in order to increase the heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Constructal tree-shaped designs for self-cooling

Yenigun¹,

Çetkin²

2016

IJHT

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In this paper, we show how a plate which is subjected to a heating load can be kept under an allowable temperature. Vascular channels in which coolant fluid flows have been embedded in the plate. Two types of vascular channel designs were compared: radial and tree-shaped. The effects of channel design on the thermal performance for different volume fractions (the fluid volume over the solid volume) are documented. Changing the design from radial to tree-shaped designs decreases the order of pressure drop. Hence increase in the order of the convection coefficient is achieved. However, treeshaped designs do not bath the entire domain. Therefore, we have inserted additional branches at the uncooled regions. Then, we have compared the peak temperatures of radial, traditional tree-shaped and improved tree-shaped designs. The effect of design on the maximum temperature shows that there should be an optimum design for a distinct set of boundary conditions, and this design should be varied as the boundary conditions change. This result is in accord with the constructal law, i.e. the shape should be varied in order to minimize resistances to the flows.

show abstract

Thermal management of electronic devices using carbon foam and PCM/nano-composite

Cited by 141 publications

References 10 publications

Experimental and numerical investigation of constructal vascular channels for self-cooling: Parallel channels, tree-shaped and hybrid designs

Experimental and numerical investigation of constructal vascular channels for self-cooling: Parallel channels, tree-shaped and hybrid designs

Studies on Preparation and Characterization of Aluminum Nitride-Coated Carbon Fibers and Thermal Conductivity of Epoxy Matrix Composites

Constructal tree-shaped designs for self-cooling

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