Convective boiling in microchannel heat sinks with spatially-varying heat generation

Koo, Jae-Mo; Jiang, Linan; Bari, Abdullahel; Zhang, L.; Wang, E.; Kenny, Thomas W.; Santiago, Juan G.; Goodson, Kenneth E.

doi:10.1109/itherm.2002.1012477

Cited by 9 publications

(4 citation statements)

References 8 publications

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“…Placing the hotspot near the outlet can effectively reduce the CHF. In addition, some experimental efforts have explored the flow boiling instabilities [11], flow maldistribution [12,13], transient behavior of heat transfer [14,15] under nonuniform microchannel heating. These studies provide a basis for understanding the physical mechanism of heat transfer in microchannels under nonuniform heating conditions.…”

Section: Efficiency 1 Introductionmentioning

confidence: 99%

A diamond made microchannel heat sink for high-density heat flux dissipation

Yang

Zhao

Huang

et al. 2019

Applied Thermal Engineering

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Flow boiling in microchannels is a promising technique for cooling high power-density electronic devices. In this study, a microchannel heat sink using ammonia as working fluid is developed, and its cooling efficiency is experimentally investigated under nonuniform high-density heat flux, which well simulates a practical heat dissipation scenario for microthermal systems. Diamond with high thermal conductivity of 1500 W/mK is selected as the microchannel heat sink material. A total of 37 parallel triangular microchannels with aspect ratio of 5, channel length of 45 mm and hydraulic diameter of 280 μm are uniformly engineered on the diamond film by laser ablation processing. The significance of diamond substrate as a heat spreader to minimize the nonuniformity of heat flux imposed by a central hotspot is verified. The influences of heat flux and mass flux on the cooling efficiency are experimentally investigated. An optimal range of outlet vapor quality from 0.10 to 0.13 is found, within which the minimum heat source temperature can be achieved. Notably, the microchannel heat sink is capable of managing a central hotspot with heat flux of 267 W/cm 2 while maintaining the heat source temperature at 53.3 °C for a mass flux of 320kg/m 2 s.

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Section: Efficiency 1 Introductionmentioning

confidence: 99%

A diamond made microchannel heat sink for high-density heat flux dissipation

Yang

Zhao

Huang

et al. 2019

Applied Thermal Engineering

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show abstract

“…They found that optimal microchannel heat sink configuration depends on the flow rate and hotspot position. Jae-Mo et al [12] carried out simulations using a theoretical model to examine the effect of hotspot location on the pressure drop in the two-phase flow region and the maximum wall temperature. They found that a hotspot located downstream showed better performance in terms of the pressure drop and maximum wall temperature than one located upstream in the microchannel heat sink.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of non-uniform heating effect on flow boiling instabilities in a microchannel-based heat sink

Bogojevic

Sefiane

Walton

et al. 2011

International Journal of Thermal Sciences

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Copyright @ 2011 ElsevierTwo-phase flow boiling in microchannels is one of the most promising cooling technologies for coping with high heat fluxes produced by the next generation of central processor units (CPUs). If flow boiling is to be used as a thermal management method for high heat flux electronics it is necessary to understand the behaviour of a non-uniform heat distribution, which is typically the case observed in a real operating CPU. The work presented is an experimental study of two-phase boiling in a multi-channel silicon heat sink with non-uniform heating, using water as the cooling liquid. Thin nickel film sensors, integrated on the back side of the heat sinks were used in order to gain insight related to temperature fluctuations caused by two-phase flow instabilities under non-uniform heating. The effect of various hotspot locations on the temperature profile and pressure drop has been investigated. It was observed that boiling inside microchannels with axially non-uniform heating leads to high temperature non-uniformity in the transverse direction.This research was supported by the UK Engineering and Physical Sciences Research Council through grant EP/D500109/1

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“…They found that optimal microchannel heat sink configuration depends on the required flow rate and hotspot position. Jae-Mo et al [9] carried out simulations using a theoretical model to examine the effect of hotspot location on the pressure drop in two-phase flow region and maximum wall temperature. They found that a hotspot located downstream showed better performance in terms of the pressure drop and maximum wall temperature than one located upstream in the microchannel heat sink.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Non-Uniform Heating on Flow Boiling Instabilities in a Microchannels Based Heat Sink

Bogojevic

Sefiane

Walton

et al. 2009

ASME 2009 7th International Conference on Nanochannels, Microchannels and Minichannels

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Two-phase flow boiling in microchannels is one of the most promising cooling technologies able to cope with high heat fluxes generated by the next generation of central processor units (CPU). If flow boiling is to be used as a thermal management method for high heat flux electronics it is necessary to understand the behaviour of a non-uniform heat distribution, which is typically the case observed in a real operating CPU. The work presented is an experimental study of two-phase boiling in a multi-channel silicon heat sink with non-uniform heating, using water as a cooling liquid. Thin nickel film sensors, integrated on the back side of the heat sinks were used in order to gain insight related to temperature fluctuations caused by two-phase flow instabilities under non-uniform heating. The effect of various hotspot locations on the temperature profile and pressure drop has been investigated, with hotspots located in different positions along the heat sink. It was observed that boiling inside microchannels with non-uniform heating led to high temperature non-uniformity in transverse direction.

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Convective boiling in microchannel heat sinks with spatially-varying heat generation

Cited by 9 publications

References 8 publications

A diamond made microchannel heat sink for high-density heat flux dissipation

A diamond made microchannel heat sink for high-density heat flux dissipation

Experimental investigation of non-uniform heating effect on flow boiling instabilities in a microchannel-based heat sink

Experimental Investigation of Non-Uniform Heating on Flow Boiling Instabilities in a Microchannels Based Heat Sink

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