Effects of pin fins and vortex generators on thermal performance in a microchannel with Al2O3 nanofluids

Epilepsy is a common chronic neurological disorder characterized by abnormally excessive and synchronized brain cell activities causing seizures. For proper functioning of the brain, epilepsy should be diagnosed with existing treatments such as medication therapy, lorazepam, benzodiazepine drug intake, and surgery. However, 30–40% of people continue to have a seizure because of the available treatments. So, the focal brain cooling device (FBC) is a new alternative cooling method in which affected brain tissue is cooled to suppress unprovoked seizures. The present numerical study investigates the cooling effectiveness by adding three different structured titanium micro pin fins in the existing base model. A finite volume-based software fluent-15.0 is used to perform transient heat transfer analysis and flow hydrodynamics. The numerical results obtained show that the temperature distribution is found and more uniform and diamond-structured micro pin fin takes less than 7 min to reach below 15 °C, which is desirable to diminish the high-frequency and high-amplitude epileptic discharges.

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“…With the addition of the pin fins, the velocity near the pin fin wall increases and delivers a better temperature distribution [45].…”

Section: Resultsmentioning

confidence: 99%

A Numerical Study on Microgap-Based Focal Brain Cooling Device to Mitigate Hotspot for the Treatment of Epileptic Seizure

Narendran

Kumar

Gnanasekaran

et al. 2022

ASME Open Journal of Engineering

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“…In terms of comprehensive performance, nanofluids have a higher PEC value. Wang et al [94] found that there is an optimum diameter and an optimum volume fraction of nanoparticles to optimize the overall performance of microchannels in convective heat transfer experiments where the medium is a nanofluid. Ali et al [95] also applied nanofluids to microchannel heat transfer experiments.…”

Section: Cooling Fluidmentioning

confidence: 99%

Topological structures for microchannel heat sink applications – a review

Wang

et al. 2023

Manufacturing Rev.

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The microchannel heat sink (MCHS) has the advantages of small heat transfer resistance, high heat transfer efficiency and small size, which exhibits good heat transfer performance in the field of active heat dissipation of electronic devices integrated with high heat flux density. In this paper, the application of MCHS in thermal management is reviewed in recent years, and the research progress of microchannel topology on enhancing heat transfer performance is summarized. Firstly, the research progress on the cross-sectional shape of the microchannel shows that the heat transfer area and fluid flow dead zone of the microchannel is the keys to affecting the heat transfer performance; Secondly, the microchannel distribution and the bionic microchannel structure have a great role in enhancing heat transfer performance, especially in microchannel temperature uniformity; Thirdly, the disturbing effect caused by interrupted structures in microchannels such as ribs and concave cavities has become a hot topic of research because it can weaken the thermal boundary layer and increase heat dissipation. Finally, the commonly used MCHS materials and cooling media are summarized and introduced. Based on the above reviews of MCHS research and applications, the future trends of MCHS topologies are presented.

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“…With the addition of nanoparticles, the heat transfer rate increased by 3.38 % compared to the water on the trapezoidal cross-section. Wang et al [7] proposed a combination scheme of micro-pin fins and vortex generators to improve heat transfer performance. The overall performance factor of the microchannel with the combined structure was 9.6% and 5.4% respectively higher than those with oval pillars and vortex generators.…”

Section: Introductionmentioning

confidence: 99%

Effects of elastic pillars on fluid-flow and heat transfer enhancement in a micro-channel

Yang

Wang

et al. 2023

THERM SCI

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In this paper, periodic vortices are generated by a fluid passing a cylindrical obstacle near the microchannel inlet. Two elastic pillars are arranged on the walls, and the effect of the pillar spacing on heat transfer performance is studied using the Arbitrary Lagrangian-Euler method. With the spacing of 10d, the small pillar amplitude of 2 ?m is not conducive to the generation of vortices. The flexible vortex generator has higher heat transfer efficiency and lower pressure loss than the rigid vortex generator. The two pillars with no spacing generate isolated vortices, and the mixing of these vortices is insufficient downstream the pillars. It is found that with the pillar spacing of 5d, the overall performance factor is significantly higher than that with the pillar spacing of 0 and 10d in the Reynolds number range of 800 to 1,100. The average Nusselt number with the spacing of 5d increases by 19.2% compared to that with the spacing of 0 at the Reynolds number of 1,000. When the Reynolds number is 1,100, the overall performance factor is 43% higher than that with a single rigid pillar. The vortices are periodically generated by the two pillars with the 5d spacing, and the disturbance to the boundary layer enhances the heat transfer downstream the region in the microchannel.

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Effects of pin fins and vortex generators on thermal performance in a microchannel with Al2O3 nanofluids

Cited by 50 publications

References 36 publications

A Numerical Study on Microgap-Based Focal Brain Cooling Device to Mitigate Hotspot for the Treatment of Epileptic Seizure

A Numerical Study on Microgap-Based Focal Brain Cooling Device to Mitigate Hotspot for the Treatment of Epileptic Seizure

Topological structures for microchannel heat sink applications – a review

Effects of elastic pillars on fluid-flow and heat transfer enhancement in a micro-channel

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