Pool boiling of saturated FC-72 on nano-porous surface

Vemuri, Srinivas; Kim, Kwang Jin

doi:10.1016/j.icheatmasstransfer.2004.03.020

Cited by 134 publications

(39 citation statements)

References 5 publications

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“…The enhancement increases with the decrease of nanoparticle size, and it can reach up to 49% at the smallest nanoparticle size (d p = 20 nm) under the present experimental conditions. The possible reasons for the nucleate pool boiling heat transfer enhancement are as follows: (1) The nano-scale porous layer forms on the heating surface due to the interaction between the nanoparticles and the heating surface [8,10,19], thus the active nucleation site density increases [20], which leads to the enhancement of the nucleate pool boiling heat transfer. (2) The nanoparticles in the lubricant excess layer interact with bubbles, inducing secondary nucleation on the bubbles [10], which leads to the enhancement of the nucleate pool boiling heat transfer.…”

Section: à2mentioning

confidence: 99%

Effect of nanoparticle size on nucleate pool boiling heat transfer of refrigerant/oil mixture with nanoparticles

Peng

Ding²,

Hu³

et al. 2011

International Journal of Heat and Mass Transfer

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a b s t r a c tEffect of nanoparticle size on nucleate pool boiling heat transfer of refrigerant/oil mixture with nanoparticles was investigated experimentally. For the preparation of the test fluid, refrigerant R113, ester oil VG68, and Cu nanoparticles with three different average diameters of 20, 50 and 80 nm were used. Experimental conditions include a saturation pressure of 101.3 kPa, heat fluxes from 10 to 80 kW m À2 , nanoparticle concentrations in the nanoparticles/oil suspension from 0 to 30 wt%, and nanoparticles/oil suspension concentrations from 0 to 5 wt%. The experimental results indicate that the nucleate pool boiling heat transfer coefficient of R113/oil mixture with Cu nanoparticles is enhanced by a maximum of 23.8% with the decrease of nanoparticle size from 80 to 20 nm under the present experimental conditions, and the enhancement increases with the decrease of nanoparticles/oil suspension concentration or the increase of nanoparticles concentrations in the nanoparticles/oil suspension. A general nucleate pool boiling heat transfer coefficient correlation for refrigerant/oil mixture with nanoparticles is proposed, and it agrees with 93% of the existing experimental data of refrigerant/oil mixture with nanoparticles within a deviation of ±20%.

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Section: à2mentioning

confidence: 99%

Effect of nanoparticle size on nucleate pool boiling heat transfer of refrigerant/oil mixture with nanoparticles

Peng

Ding²,

Hu³

et al. 2011

International Journal of Heat and Mass Transfer

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show abstract

“…The thermal performance improvement was the result of surface area enhancement, fin efficiency, surface microstructure, reduction of vapor bubble departure resistance, and re-wetting liquid flow resistance. Vemuri and Kim (2005) experimentally investigated the boiling heat transfer characteristics of nano-porous surfaces made of aluminum oxide with a thickness of 70 µm using FC-72 as the working fluid. The superheat was reduced by 30% at the same heat flux compared to that of a plain aluminum oxide surface.…”

Section: Frontiers In Heat and Mass Transfermentioning

confidence: 99%

Experimental Study of Enhanced Nucleate Boiling Heat Transfer on Uniform and Modulated Porous Structures

Li¹,

Peterson²

2010

Frontiers in Heat and Mass Transfer

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An experimental investigation of the Critical Heat Flux (CHF) and heat transfer coefficient (HTC) of two-phase heat transfer of de-Ionized (DI) water, pool boiling was conducted using several kinds of sintered copper microparticle porous uniform and modulated structures. The modulated porous structure reached a heat flux of 450 W/cm 2 and a heat transfer coefficient of 230,000 W/m 2 K. The thick and thin uniform porous structures achieved CHFs of 290 W/cm 2 and 227 W/cm 2 , respectively, and heat transfer coefficients of 118,000 W/m 2 K and 104,000 W/m 2 K. The mechanisms for the dramatically improved CHFs and HTCs were identified with assistance of a visualization study.

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“…Initially, we attributed the outstanding boiling heat transfer performance of the NMp structures to the sub-micrometersized dendritic Cu branches, since nanostructured materials have been shown to reduce the nucleation energy barrier. [24,25] However, it has also been reported that nano-scale structures may exhibit a negative effect on enhanced boiling. [26] It is noted that the combination of nano-scale features, i.e., nanocavities, and macro-scale structures often shows enhanced boiling performance of the surface.…”

Section: Full Papermentioning

confidence: 99%

Nature‐Inspired Boiling Enhancement by Novel Nanostructured Macroporous Surfaces

Furberg

Toprak

et al. 2008

Adv Funct Materials

128

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World energy crisis has triggered more attention to energy saving and energy conversion systems. Enhanced surfaces for boiling are among the applications of great interest since they can improve the energy efficiency of heat pumping equipment (i.e., air conditioners, heat pumps, refrigeration machines). Methods that are used to make the state‐of‐the‐art enhanced surfaces are often based on complicated mechanical machine tools, are quite material‐consuming and give limited enhancement of the boiling heat transfer. Here, we present a new approach to fabricate enhanced surfaces by using a simple electrodeposition method with in‐situ grown dynamic gas bubble templates. As a result, a well‐ordered 3D macro‐porous metallic surface layer with nanostructured porosity is obtained. Since the structure is built based on the dynamic bubbles, it is perfect for the bubble generation applications such as nucleate boiling. At heat flux of 1 W cm‐2, the heat transfer coefficient is enhanced over 17 times compared to a plain reference surface. It's estimated that such an effective boiling surface would improve the energy efficiency of many heat pumping machines with 10–30%. The extraordinary boiling performance is explained based on the structure characteristics.

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Pool boiling of saturated FC-72 on nano-porous surface

Cited by 134 publications

References 5 publications

Effect of nanoparticle size on nucleate pool boiling heat transfer of refrigerant/oil mixture with nanoparticles

Effect of nanoparticle size on nucleate pool boiling heat transfer of refrigerant/oil mixture with nanoparticles

Experimental Study of Enhanced Nucleate Boiling Heat Transfer on Uniform and Modulated Porous Structures

Nature‐Inspired Boiling Enhancement by Novel Nanostructured Macroporous Surfaces

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