Boiling Heat Transfer by Nucleate Boiling of Immiscible Liquids

Onishi, Shunsuke; Ohta, Hiroyuki; Ohtani, Namio; Fukuyama, Yuta; Kobayashi, Hiroyuki

doi:10.1615/interfacphenomheattransfer.2013007205

Cited by 10 publications

(8 citation statements)

References 23 publications

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“…1.7 (Sakashita et al, 2010) CHF (Sakai et al, 2010) ( Gordon et al, 1961, Sump andWestwater, 1971) FC-72 0.5-2.0 % 0.2-1.0 % (Roesle and Kulacki, 2012) 1.0 % FC-72 ( ) (Onishi et al, 2013, Okayama et al, 2016 ( Shinmoto et al, 2017) 2 2…”

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confidence: 99%

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Characteristics of heat transfer under boiling refrigerant transition by pool boiling of immiscible mixtures (Effects of the height of more-volatile liquid layer)

Kawanami

Hara

Takagaki

et al. 2019

Transactions of the JSME (In Japanese)

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confidence: 99%

“…Intermediate burnout (Onishi et al, 2013) Greene (Greene et al, 1988) Greene Kelvin-Helmholtz (Kawanami et al) 2.…”

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confidence: 99%

Characteristics of heat transfer under boiling refrigerant transition by pool boiling of immiscible mixtures (Effects of the height of more-volatile liquid layer)

Kawanami

Hara

Takagaki

et al. 2019

Transactions of the JSME (In Japanese)

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“…On the other hand, to ensure the high reliability for a long-term operation, microstructures on the "enhanced surface" cannot be accepted depending on their application. The present authors noticed the superior heat transfer characteristics in nucleate boiling of immiscible mixtures even on a smooth surface (Kobayashi et al [7], Ohnishi et al [8], Kita et al [9]), which are summarized as follows.…”

Section: Expected Performance Of Immiscible Mixturesmentioning

confidence: 75%

Boiling of Immiscible Mixtures for Cooling of Electronics

Ohta¹,

Shinmoto²,

Yamamoto³

et al. 2016

Electronics Cooling

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To satisfy the requirements for the cooling of small and large semiconductors operated at high heat flux density, an innovative cooling method using boiling heat transfer to immiscible liquid mixtures is proposed. Immiscible liquid mixtures discussed here are composed of more-volatile liquid with higher density and less-volatile liquid with lower density, and appropriate volumetric ratios become a key to realize high-performance cooling. The chapter reviews the experimental results obtained by the present authors, where critical heat flux accompanied by the catastrophic surface temperature excursion is increased up to W/cm for FC /water by using a flat heating surface of mm in diameter facing upwards under the pressure . MPa.To apply the superior heat transfer characteristics in boiling of immiscible mixtures to flow boiling system, preliminary experiments using a horizontal heated tube are performed and the classification of flow pattern with liquid-liquid interface and corresponding heat transfer performance are discussed.

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“…These behaviors are usual for flow boiling in narrow channels. In (Kobayashi et al, 2012;Ohnishi et al, 2013;Kita et al, 2014;Ohta et al, 2015). Even in such a case, the serious heat transfer deterioration accompanied by the catastrophic surface temperature excursion can be avoided by the lateral penetration of less-volatile liquid as an alternative cooling medium in place of more-volatile liquid.…”

Section: Evaluation Of Fluid Temperature Distribution In Flow Directionmentioning

confidence: 99%

“…The present authors proposed the employment of immiscible mixtures as working fluids for flow boiling cooling systems for these applications. From the experimental results in pool boiling (Kobayashi et al, 2012;Ohnishi et al, 2013;Kita et al, 2014), the advantages of the immiscible mixtures are obvious and summarized as follows.…”

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Heat Transfer Characteristics during Boiling of Immiscible Liquids Flowing in Narrow Rectangular Heated Channels

et al. 2017

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The use of immiscible liquids for cooling of surfaces with high heat generation density is proposed based on the experimental verification of its superior cooling characteristics in fundamental systems of pool boiling and flow boiling in a tube. For the purpose of practical applications, however, heat transfer characteristics due to flow boiling in narrow rectangular channels with different small gap sizes need to be investigated. The immiscible liquids employed here are FC72 and water, and the gap size is varied as 2, 1, and 0.5 mm between parallel rectangular plates of 30 mm × 175 mm, where one plate is heated. To evaluate the effect of gap size, the heat transfer characteristics are compared at the same inlet velocity. The generation of large flattened bubbles in a narrow gap results in two opposite trends of the heat transfer enhancement due to thin liquid film evaporation and of the deterioration due to the extension of dry patch in the liquid film. The situation is the same as that observed for pure liquids. The latter negative effect is emphasized for extremely small gap sizes if the flow rate ratio of more-volatile liquid to the total is not reduced. The addition of small flow rate of less-volatile liquid can increase the critical heat flux (CHF) of pure more-volatile liquid, while the surface temperature increases at the same time and assume the values between those for more-volatile and less-volatile liquids. By the selection of small flow rate ratio of more-volatile liquid, the surface temperature of pure less-volatile liquid can be decreased without reducing high CHF inherent in the less-volatile liquid employed. The trend of heat transfer characteristics for flow boiling of immiscible mixtures in narrow channels is more sensitive to the composition compared to the flow boiling in a round tube.

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Boiling Heat Transfer by Nucleate Boiling of Immiscible Liquids

Cited by 10 publications

References 23 publications

Characteristics of heat transfer under boiling refrigerant transition by pool boiling of immiscible mixtures (Effects of the height of more-volatile liquid layer)

Characteristics of heat transfer under boiling refrigerant transition by pool boiling of immiscible mixtures (Effects of the height of more-volatile liquid layer)

Boiling of Immiscible Mixtures for Cooling of Electronics

Heat Transfer Characteristics during Boiling of Immiscible Liquids Flowing in Narrow Rectangular Heated Channels

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