Dynamic Nanofin Heat Sinks

Yi, Pyshar; Khoshmanesh, Khashayar; Chrimes, Adam F.; Campbell, Jos L.; Ghorbani, Kamran; Nahavandi, Saeid; Rosengarten, Gary; Kalantar‐zadeh, Kourosh

doi:10.1002/aenm.201300537

Cited by 17 publications

(8 citation statements)

References 32 publications

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“…Few surfaces currently possess the ability to adapt their features to the various regimes associated with phase change, but such strategies are feasible (e.g. using either passive thermal sensitive liquid crystal coatings 342 , or magnetophoretic assembly of nanoparticles into nanofins for on-demand hot spot cooling 343 ).…”

Section: Discussionmentioning

confidence: 99%

Surface engineering for phase change heat transfer: A review

Attinger

Frankiewicz

Betz

et al. 2014

MRS Energy & Sustainability

336

195

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Among numerous challenges to meet the rising global energy demand in a sustainable manner, improving phase change heat transfer has been at the forefront of engineering research for decades. The high heat transfer rates associated with phase change heat transfer are essential to energy and industry applications; but phase change is also inherently associated with poor thermodynamic efficiencies at low heat flux, and violent instabilities at high heat flux. Engineers have tried since the 1930's to fabricate solid surfaces that improve phase change heat transfer. The development of micro and nanotechnologies has made feasible the high-resolution control of surface texture and chemistry over length scales ranging from molecular levels to centimeters. This paper reviews the fabrication techniques available for metallic and siliconbased surfaces, considering sintered and polymeric coatings. The influence of such surfaces in multiphase processes of high practical interest, e.g. boiling, condensation, freezing, and the associated physical phenomena are reviewed. The case is made that while engineers are in principle able to manufacture surfaces with optimum nucleation or thermofluid transport characteristics, more theoretical and experimental efforts are needed to guide the design and cost-effective fabrication of surfaces that not only satisfy the existing technological needs, but also catalyze new discoveries.

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Section: Discussionmentioning

confidence: 99%

Surface engineering for phase change heat transfer: A review

Attinger

Frankiewicz

Betz

et al. 2014

MRS Energy & Sustainability

336

195

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“…25,26 We have previously shown that CrO 2 magnetic nanoparticles can be dynamically formed onto the hot spots magnetophoretically to allow the efficient heat exchange with a coolant liquid in a microchannel. 19 We demonstrated the formation of bundles of micro-sized and long fins from the assembled nanoparticles, which we called nanofins, that could significantly enhance the cooling process. This was due to the high aspect ratio of the fins and their flexible structure that could allow the large interaction of the liquid coolant with them.…”

Section: Introductionmentioning

confidence: 99%

“…17,18 By doing this, the nanoparticles' concentration can be increased at the desired location, whilst their average concentration within the microfluidic system can be kept at a low magnitude to allow for facile liquid flow. 19,20 Among nanofluids are ferrofluids that consist of nanoscale magnetic particles in a non-magnetic liquid and have been widely used for cooling of microelectronic devices. [21][22][23][24] In this case, the suspended magnetic nanoparticles can be manipulated by external magnetic fields to enhance heat transfer along the well-aligned magnetic nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Investigation of different nanoparticles for magnetophoretically enabled nanofin heat sinks in microfluidics

Khoshmanesh

Campbell

et al. 2014

Lab Chip

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Assembled nanofin heat sinks, nanostructures which are formed via external forces in a cooling microfluidic to remove heat from hot spots, are a new concept that has recently been introduced. In this work, we investigate nanofin structures formed by CrO2 and Fe2O3 magnetic nanoparticles and compare their performance. Thermal imaging is used for comparison of three cases including: (i) DI water as the coolant liquid, (ii) suspension of magnetic particles in DI water, and (iii) suspension of magnetic particles in DI water in the presence of a magnetic field. For each case, the experiments are conducted at three different flow rates of 10, 40 and 120 μl min(-1). Our results suggest that the high thermal conductivity of the nanofins composed of CrO2 significantly enhances the heat exchange across the microchannel. The proof-of-concept magnetophoretic system can offer a practical solution for the cooling of future compact electronics.

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“…In these works, the fabrication of microchannels becomes a crucial part for chip cooling. Different from a traditional heat sink with static fins, Yi, P. et al proposed dynamic nanofin heat sinks magnetically controlling CrO 2 nanoparticles onto hot spots, which significantly increased the heat sinking efficiency [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

PDMS-PDMS Micro Channels Filled with Phase-Change Material for Chip Cooling

et al. 2018

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This paper reports on a chip cooling solution using polydimethylsiloxane (PDMS) based microfluidic devices filled with n-Octadecane. A thick SU-8 layer of 150 µm is used as the master mold for patterning PDMS fabrication. With the SU-8 mold, patterns with straight lines at microscale have been fabricated with standard micro-electro-mechanical system (MEMS) technology. Thermal polymer bonding technique is used to bond the PDMS pattern directly to a flat polydimethylsiloxane (PDMS) film which results in the sealed microchannels. n-Octadecane as a phase-change material has been successfully filled in the microchannels using a dispensing machine. Infrared thermal image shows a sharp contrast of the temperature distribution between the chip with n-Octadecane and the empty chip during the same heating process. This result indicates an efficient cooling performance of the microchannel device with phase-change material. A thermal stimulation test demonstrates that a 16 °C-lower temperature difference can be achieved. This microchannel device, benefited from the flexibility of PDMS substrate, shows specific advantages in meeting the need for the heat dissipation of flexible electronics such as flexible displays, electronic skins, and wearable electronics. Latent heat of the phase-change material can keep the temperature of devices relatively lower over a period of time, which shows potential application values on discontinuously active flexible electronic devices.

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Dynamic Nanofin Heat Sinks

Cited by 17 publications

References 32 publications

Surface engineering for phase change heat transfer: A review

Surface engineering for phase change heat transfer: A review

Investigation of different nanoparticles for magnetophoretically enabled nanofin heat sinks in microfluidics

PDMS-PDMS Micro Channels Filled with Phase-Change Material for Chip Cooling

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