Research Papers: Jets, Wakes, and Impingment Cooling

Thermal Analysis of Multijet Impingement Through Porous Media to Design a Confined Heat Management System

[+] Author and Article Information
Carlos Zing

Mechanical Engineering Department,
California State University, Northridge,
Northridge, CA 91330

Shadi Mahjoob

Mechanical Engineering Department,
California State University, Northridge,
Northridge, CA 91330
e-mail: shadi.mahjoob@csun.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received February 6, 2019; final manuscript received May 23, 2019; published online July 3, 2019. Assoc. Editor: Amy Fleischer.

J. Heat Transfer 141(8), 082203 (Jul 03, 2019) (12 pages) Paper No: HT-19-1067; doi: 10.1115/1.4044008 History: Received February 06, 2019; Revised May 23, 2019

Thermal management has a key role in the development of advanced electronic devices to keep the device temperature below a maximum operating temperature. Jet impingement and high conductive porous inserts can provide a high efficiency cooling and temperature control for a variety of applications including electronics cooling. In this work, advanced heat management devices are designed and numerically studied employing single and multijet impingement through porous-filled channels with inclined walls. The base of these porous-filled nonuniform heat exchanging channels will be in contact with the devices to be cooled; as such the base is subject to a high heat flux leaving the devices. The coolant enters the heat exchanging device through single or multijet impingement normal to the base, moves through the porous field and leaves through horizontal exit channels. For numerical modeling, local thermal nonequilibrium model in porous media is employed in which volume averaging over each of the solid and fluid phase results in two energy equations, one for solid phase and one for fluid phase. The cooling performance of more than 30 single and multijet impingement designs are analyzed and compared to achieve advantageous designs with low or uniform base temperature profiles and high thermal effectiveness. The effects of porosity value and employment of 5% titanium dioxide (TiO2) in water in multijet impingement cases are also investigated.

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Grahic Jump Location
Fig. 1

Schematic diagrams: (a) front view of single jet impingement, (b) front view of multijet impingements, (c) a three-dimensional case with single rectangular cross section inlet channel, and (d) a three-dimensional case with multisquare cross section inlet channels

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Fig. 7

Nondimensional temperature contours across the base of cases A3d–O3d

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Fig. 6

Nondimensional temperature profiles across the base for investigated three-dimensional single and multi-inlet cases A3d–O3d: (a) along streamwise direction and (b) along transverse direction

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Fig. 5

Nondimensional temperature distribution along streamwise direction for channels with and without inclined walls

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Fig. 8

Nondimensional fluid and solid temperature profiles for cases A3d and C3d with porosity values of 0.45 and 0.9: (a) X = 0, (b) X = 0.5, and (c) X = 1

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Fig. 2

Nondimensional base temperature profiles along the streamwise direction for grid independence study: (a) case C3d and (b) case N3d

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Fig. 3

Comparison of current numerical study with analytical data [37] for flow through a uniform confined porous-filled channel: (a) schematic diagram of the channel, (b) nondimensional solid and fluid temperature profiles at Bi = 10, ε = 0.1, κ = 0.11 for Φ = 0 and 1

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Fig. 4

Nondimensional base temperature for investigated two-dimensional cases defined in Table1: (a) set 1, (b) set 2, and (c) set 3

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Fig. 9

Nondimensional base temperature along streamwise direction: (a) cases A3d and C3d with water and TiO2 coolants and ε = 0.45, (b) cases A3d and C3d with water and TiO2 coolants and ε = 0.9, and (c) cases B3d, D3d, G3d, H3d, L3d, M3d, N3d, and O3d with TiO2 coolant and ε = 0.45



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