Design and numerical investigations of natural convection heat transfer of a new rippling fin shape

Ghandouri, Ihssane El; Maâkoul, Anas El; Saadeddine, Said; Meziane, Mohamed

doi:10.1016/j.applthermaleng.2020.115670

Cited by 47 publications

(12 citation statements)

References 45 publications

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“…During immersion liquid cooling, the hot electronic components is immersed in the coolant, and their heat is transferred via convection. Then, the heat of the coolant is exported in the external refrigeration system [16][17][18].…”

Section: Cooling System Designmentioning

confidence: 99%

Design and Optimization of an Immersion Liquid Cooling System in Internet Datacenter

Song¹,

Liu²,

Li³

et al. 2021

IJHT

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With the development of high-performance chips, the heat flux of Internet datacenter (IDC) is on the rise, and heat dissipation becomes a major bottleneck of IDC development. The cooling needs of the IDC room can hardly be met by the traditional method of air cooling. In recent years, immersion liquid cooling has attracted a growing attention, due to its excellent performance. This paper designs and optimizes an immersion liquid cooling system for IDC. Multiple numerical simulations were carried out to analyze the influence of the system parameters on heat dissipation, and improve the system efficiency using a dielectric coolant. Specifically, 20 graphics processing units (GPUs) and 2 central processing units (CPUs) were set up in each machine of the liquid cooling server. Then, the GPU and CPU temperature was examined under different opening positions on the server top plate, inlet coolant temperatures, and coolant flow speeds. The results show that a 30mm-wide, 430mm-long opening should be set at the upper part of the GPU array, 20mm away from the top plate. The cooling effect can be optimized at the inlet temperature of 30℃, and the coolant flow speed of 3m3/h.

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Section: Cooling System Designmentioning

confidence: 99%

Design and Optimization of an Immersion Liquid Cooling System in Internet Datacenter

Song¹,

Liu²,

Li³

et al. 2021

IJHT

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“…2014; El Ghandouri et al. 2020). Various experimental techniques have been adopted for mapping the thermal field to assess the detailed heat transfer performance.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

“…The need to better understand the interaction between the surface microstructure and the buoyancy-driven flow has motivated many experimental and numerical investigations to assess the usefulness and the feasibility of adding different types of protrusions to the heated surfaces in terms of their effects on the flow regime, the heat transfer characteristics and the mass of the cooling modules. Examples of some surface alterations/extensions, considered in previous investigations, are displayed in figure 1, including periodic (wavy, rounded, zigzag) corrugations (Kishinami et al 1990;Bhavnani & Bergles 1991;Yao 2006;Haervig & Sørensen 2020), steps (Bhavnani & Bergles 1990), two-dimensional ribs (Tanda 1997;Cavazzuti & Corticelli 2008) and different arrangements of fins (Guglielmini et al 1987;Ahmadi et al 2014;El Ghandouri et al 2020). Various experimental techniques have been adopted for mapping the thermal field to assess the detailed heat transfer performance.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

“…Schematic drawings of some surface alterations examined in the literature. The indicated geometries are (from top left to bottom right): sinusoidal waves (Bhavnani & Bergles 1991), complex waves (Yao 2006), convex-concave semi-circles (Kishinami, Saito & Tokura 1990), zigzag shaping (Haervig & Sørensen 2020), steps (Bhavnani & Bergles 1990); transverse square ribs (Tanda 1997), transverse trapezoidal ribs (Cavazzuti & Corticelli 2008), rippled vertical fins (El Ghandouri et al 2020), staggered arrangement of interrupted fins (Guglielmini, Nannei & Tanda 1987), in-line arrangement of interrupted fins (Ahmadi, Mostafavi & Bahrami 2014). (Engquist & Souganidis 2008) which are characterized by some sort of periodicity or pseudo-periodicity.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

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A homogenization approach for buoyancy-induced flows over micro-textured vertical surfaces

2022

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Asymptotic homogenization is employed to formulate upscaled effective boundary conditions at a smooth virtual surface for a natural-convection flow over a periodically roughened vertical wall, to bypass the expensive numerical resolution of flow and temperature fields near and within wall corrugations. Microscale problems are found by expanding near-wall variables in terms of a small parameter $\epsilon$ , the ratio between the microscopic and the macroscopic length scales. The expressions of the upscaled velocity and temperature boundary conditions are provided up to second-order accuracy in $\epsilon$ . The case of transverse square ribs is considered as a representative example. The classical Navier-slip condition for the streamwise and the spanwise velocity components is modified at second order by the gradient of the normal stress and the time derivative of the shear stress. The streamwise slip velocity is additionally corrected by a buoyancy term at first order and a temperature-gradient term at second order. The normal velocity at the virtual surface appears only as a second-order transpiration condition. A Robin-like condition for the temperature is found, where the wall temperature is corrected with a temperature-gradient term representing thermal slip. The accuracy levels and the applicability range of the effective conditions to mimic the macroscopic flow behaviour are investigated under laminar flow conditions, in comparison with results of full feature-resolving simulations. A formal validity limit for the approximation is sought in terms of a single accuracy criterion ( $C$ ), which combines the effects of the Grashof number and the ribs’ density. The introduced model is further tested on different rib geometries.

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“…Nilpueng et al [11] investigated sinusoidal wavy plate fins with phase shift of 0 • , 90 • , and 180 • , and found that the phase shift had a great influence on thermal performance. Ghandouri et al [12] designed a new rippling fin, and the natural convection heat transfer was enhanced by 78%, and it had a mass reduction of 47.83% compared to rectangular fins. Shyu et al [13] tested the thermal performance of plate-fin heat sinks with different types of winglets, and the results showed that heat transfer was enhanced compared to plain plate-fin heat sinks.…”

Section: Introductionmentioning

confidence: 99%

Increasing Efficiency of a Finned Heat Sink Using Orthogonal Analysis

Cui

Cao³

et al. 2021

Energies

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As the heat flux of electronic components is increasing rapidly, the traditional air-cooling technique is gradually not meeting the requirements of thermal management. The immersion liquid-cooling technique shows great potential, and has attracted increasing attention due to its excellent performance in recent years. The finned heat sink is common and essential for cooling electric components. To analyze the influences of its structural parameters on heat dissipation and improve its efficiency while using a dielectric coolant, this study used the orthogonal analysis method to obtain the optimal structure via the numerical simulation method. The maximum temperature of the heat sink was selected as the evaluation criteria. The results showed that the parameters that affect the maximum temperature, in order of importance, are fin thickness, the number of fins, the height of the fins, and substrate thickness. Finally, taking the maximum temperature and mass as indexes obtained the optimal structure of the heat sink. The mass was reduced by 19%, while the temperature only increased by 4.5% when considering the mass index.

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Design and numerical investigations of natural convection heat transfer of a new rippling fin shape

Cited by 47 publications

References 45 publications

Design and Optimization of an Immersion Liquid Cooling System in Internet Datacenter

Design and Optimization of an Immersion Liquid Cooling System in Internet Datacenter

A homogenization approach for buoyancy-induced flows over micro-textured vertical surfaces

Increasing Efficiency of a Finned Heat Sink Using Orthogonal Analysis

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