Investigation into the performance of turbulence models for fluid flow and heat transfer phenomena in electronic applications

Dhinsa, K.; Bailey, C.; Pericleous, K.

doi:10.1109/stherm.2004.1291335

Cited by 7 publications

(2 citation statements)

References 19 publications

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“…URANS simulations were conducted using the Wilcox k-ω turbulence model (Wilcox, 1994; Dhinsa et al, 2005) previously validated by our group experimentally (Bluestein et al, 2000) and applied by us in numerous MHV flow simulations studies (Bluestein et al, 2000; Bluestein et al, 2002; Bluestein et al, 2004; Yin et al, 2004; Alemu, Bluestein, 2007). We have employed a progressive density highly resolved numerical meshes approach (Alemu, Bluestein, 2007) (9×10 6 and 10×10 6 finite volumes for the SJM and the ATS valves, correspondingly) that enabled to accurately capture various hydrodynamic effects in the small confines of MHV complex geometries.…”

Section: Methodsmentioning

confidence: 99%

Device Thrombogenicity Emulator (DTE) − Design optimization methodology for cardiovascular devices: A study in two bileaflet MHV designs

Xenos

Girdhar

Alemu

et al. 2010

Journal of Biomechanics

106

142

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Patients who receive prosthetic heart valve (PHV) implants require mandatory anticoagulation medication after implantation due to the thrombogenic potential of the valve. Optimization of PHV designs may facilitate reduction of flow-induced thrombogenicity and reduce or eliminate the need for post-implant anticoagulants. We present a methodology entitled Device Thrombogenicty Emulator (DTE) for optimizing the thrombo-resistance performance of PHV by combining numerical and experimental approaches. Two bileaflet mechanical heart valves (MHV) designs -St. Jude Medical (SJM) and ATS were investigated, by studying the effect of distinct flow phases on platelet activation. Transient turbulent and direct numerical simulations (DNS) were conducted, and stress loading histories experienced by the platelets were calculated along flow trajectories. The numerical simulations indicated distinct design dependent differences between the two valves. The stress-loading waveforms extracted from the numerical simulations were programmed into a hemodynamic shearing device (HSD), emulating the flow conditions past the valves in distinct 'hot spot' flow regions that are implicated in MHV thrombogenicity. The resultant platelet activity was measured with a modified prothrombinase assay, and was found to be significantly higher in the SJM valve, mostly during the regurgitation phase. The experimental results were in excellent agreement with the calculated platelet activation potential. This establishes the utility of the DTE methodology for serving as a test bed for evaluating design modifications for achieving better thrombogenic performance for such devices.

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Section: Methodsmentioning

confidence: 99%

Device Thrombogenicity Emulator (DTE) − Design optimization methodology for cardiovascular devices: A study in two bileaflet MHV designs

Xenos

Girdhar

Alemu

et al. 2010

Journal of Biomechanics

106

142

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“…where and are respectively the fluid velocity vector and the fluid pressure (Pa), and denotes the unit matrix. The standard -turbulence model has been used to solve the governing equations, as this model has been shown to capture the physics well for other similar heat transfer studies [31,42,43]. Themodel introduces two additional variables: the turbulent kinetic energy, ), and specific dissipation (12) rate, .…”

Section: Governing Equationsmentioning

confidence: 99%

Thermal management of GaN HEMT devices using serpentine minichannel heat sinks

Al-Neama

Kapur

Summers

et al. 2018

Applied Thermal Engineering

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An experimental and numerical investigation of water-cooled serpentine rectangular minichannel heat sinks (MCHS) has been performed to assess their suitability for the thermal management of gallium nitride (GaN) high-electron-mobility transistors (HEMTs) devices. A Finite Element-based conjugate heat transfer model is developed, validated experimentally and used to determine the optimal minichannel width and number of minichannels for a case with a uniform heat flux of 100 W/cm 2. The optimisation process uses a 30 point Optimal Latin Hypercubes Design of Experiments, generated from a permutation genetic algorithm, and accurate metamodels built using a Moving Least Square approach. A Pareto front is then constructed to enable the compromises available between designs with a low pressure drop and those with low thermal resistance to be explored and an appropriate minichannel width and number of minichannels to be chosen. These parameters are then used within conjugate heat transfer models of a serpentine MCHS with silicon, silicon carbide, diamond and graphene heat spreaders placed above a GaN HEMT heating source of area 4.8 × 0.8 mm 2 , generating 1823 W/cm 2. A nanocrystalline diamond (NCD) layer with thickness of 2 µm is mounted on the top surface of the GaN HEMT to function as a heat spreader to mitigate the hot spots. The effect of volumetric flow rate and heat spreader thickness on the chip temperature has been investigated numerically and each of these has been shown to be influential. For example, at a volumetric flow rate of 0.10 l/min, the maximum chip temperature can be reduced from 124.7 o C to 96.7 o C by employing a 25 µm thick graphene heat spreader attached to the serpentine MCHS together with a NCD layer compared with a serpentine MCHS without these heat spreaders.

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Turbulence Modelling for Electronic Cooling: A Review

Dhinsa

Bailey

Pericleous

2005 International Symposium on Electronics Materials and Packaging

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Investigation into the performance of turbulence models for fluid flow and heat transfer phenomena in electronic applications

Cited by 7 publications

References 19 publications

Device Thrombogenicity Emulator (DTE) − Design optimization methodology for cardiovascular devices: A study in two bileaflet MHV designs

Device Thrombogenicity Emulator (DTE) − Design optimization methodology for cardiovascular devices: A study in two bileaflet MHV designs

Thermal management of GaN HEMT devices using serpentine minichannel heat sinks

Turbulence Modelling for Electronic Cooling: A Review

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