Performance comparison of wavy microchannel heat sinks with wavy bottom rib and side rib designs

Zhu, Ji-Feng; Li, Xian-Yang; Wang, Shuo-Lin; Yang, Yan‐Ru; Wang, Xiaodong

doi:10.1016/j.ijthermalsci.2019.106068

Cited by 71 publications

(21 citation statements)

References 42 publications

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“…To date, air cooling is still the commonly employed cooling solution in data centers, 2 but the capacity is usually limited by poor thermal properties of air, even with some enhancement strategies, e.g., heat sinks. 3 In addition, miniaturization and integration of electronics result in large increases in the heat load. For example, it is reported that the heat load of a blade server could reach up to 7.5–10.5 kW by 2020, 4 which might be too high to be dissipated rapidly by air cooling.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle-Assisted Pool Boiling Heat Transfer on Micro-Pin-Fin Surfaces

et al. 2021

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Boiling heat transfer intensification is of significant relevance to energy conversion and various cooling processes. This study aimed to enhance the saturated pool boiling of FC-72 (a dielectric liquid) by surface modifications and explore mechanisms of the enhancement. Specifically, circular and square micro pin fins were fabricated on silicon surfaces by dry etching and then copper nanoparticles were deposited on the micro-pin-fin surfaces by electrostatic deposition. Experimental results indicated that compared with a smooth surface, the micro pin fins increased the heat transfer coefficient and the critical heat flux by more than 200 and 65–83%, respectively, which were further enhanced by the nanoparticles up to 24% and more than 20%, respectively. Correspondingly, the enhancement mechanism was carefully explored by high-speed bubble visualizations, surface wickability measurements, and model analysis. It was quantitatively found that small bubble departure diameters with high bubble departure frequencies promoted high heat transfer coefficients. The wickability, which characterizes the ability of a liquid to rewet a surface, played an important role in determining the critical heat flux, but further analyses indicated that evaporation beneath bubbles was also essential and competition between the wicking and the evaporation finally triggered the critical heat flux.

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Section: Introductionmentioning

confidence: 99%

Nanoparticle-Assisted Pool Boiling Heat Transfer on Micro-Pin-Fin Surfaces

et al. 2021

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“…Zhu et al 8 designed microchannel side walls as a wave structure. Through numerical simulation, the heat transfer performance of left‐right and up‐down wavy microchannel heat sinks were analyzed, and the amplitude, wavelength, high aspect ratio, and width ratios of channel to pitch were explored.…”

Section: Introductionmentioning

confidence: 99%

Impact of N‐Structure Geometry on Heat Transfer in a Microchannel Heat Exchanger

Zhang

Pan

2021

Chem Eng & Technol

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A new microchannel heat exchanger with N‐structure is proposed to balance the heat transfer performance and pressure drop. A straight channel section equal to the wavelength of the continuous wave microchannel is added to create an N‐structure microchannel. The relationship between different N‐structures of the microchannel and the heat transfer performance as well as the structural influence of the N‐structure on heat transfer characteristics are investigated. The performance of the microchannel is affected by the arrangement of wave channel sections in the N‐structure. The symmetrical N‐structure has the best heat transfer effect. The pressure drop between the inlet and outlet of the cold side is mainly influenced by the structure of the microchannel. A superior transfer performance is associated with the pressure drop.

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“…Various approaches and designs have been applied to enhance the thermal performance of heat sinks, among which a promising passive technique is to utilise surface features in integrated cooling systems [5]. Surface features can be employed in different forms such as pin-fin structures [6][7][8], vortex generators [9][10][11] and corrugated channels [12][13][14][15]. However, the increased pumping power required to drive coolants in cooling systems is an inherent unfavourable circumstance [5].…”

Section: Introductionmentioning

confidence: 99%

Thermal and hydraulic performance analysis of a heat sink with corrugated channels and nanofluids

Naranjani

Roohi

Ebrahimi

2020

J Therm Anal Calorim

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Cooling of electronic devices is one of the critical challenges that the electronics industry is facing towards sustainable development. Aiming at lowering the surface temperature of the heat sink to limit thermally induced deformations, corrugated channels and nanofluids are employed to improve the thermal and hydraulic performances of a heat sink. Three-dimensional simulations based on the finite-volume approach are carried out to study conjugated heat transfer in the heat sink. Water-based nanofluids containing $$\hbox {Al}_{2}\hbox {O}_{3}$$ Al 2 O 3 nanoparticles with two different particle sizes (29 nm and 40 nm) and volume fractions less than 4% are employed as the coolant, and their influence on the thermal and hydraulic performance of the heat sink is compared with the base fluid (i.e. water). An empirical model is utilised to approximate the effective transport properties of the nanofluids. Employing corrugated channels instead of straight channels in the heat sink results in an enhancement of 24–36% in the heat transfer performance at the cost of 20–31% increase in the required pumping power leading to an enhancement of 16–24% in the overall performance of the heat sink. Additionally, the numerical predictions indicate that the overall performance of the proposed heat sink design with corrugated channels and water–$$\hbox {Al}_{2}\hbox {O}_{3}$$ Al 2 O 3 nanofluids is 22–40% higher than that of the water-cooled heat sink with straight channels. It is demonstrated that the overall performance of the heat sink cooled with water–$$\hbox {Al}_{2}\hbox {O}_{3}$$ Al 2 O 3 nanofluids increases with reducing the average nanoparticle size. Additionally, the maximum temperature rise in the heat sinks is determined for different thermal loads.

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Performance comparison of wavy microchannel heat sinks with wavy bottom rib and side rib designs

Cited by 71 publications

References 42 publications

Nanoparticle-Assisted Pool Boiling Heat Transfer on Micro-Pin-Fin Surfaces

Nanoparticle-Assisted Pool Boiling Heat Transfer on Micro-Pin-Fin Surfaces

Impact of N‐Structure Geometry on Heat Transfer in a Microchannel Heat Exchanger

Thermal and hydraulic performance analysis of a heat sink with corrugated channels and nanofluids

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