Surface roughening for hemi-wicking and its impact on convective boiling heat transfer

Kim, Beom Seok; Choi, Geehong; Shim, Dong Il; Kim, Kyung Min; Cho, Hyung Hee

doi:10.1016/j.ijheatmasstransfer.2016.07.008

Cited by 45 publications

(31 citation statements)

References 47 publications

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“…Considering that their tube was sandblasted and thus had a relatively high roughness (Ra of 3.14 µm), it is likely that the nanoparticles deposited on the surface reduced the roughness and number of active nucleation sites. The heat transfer of plain surfaces was improved in some studies when nanostructures were added to the pool boiling of refrigerants [18] and Fluorinerts [19][20][21], and the flow boiling of Fluorinerts [22], with authors attributing this to increased nucleation site density caused by the particular nanocoatings used. In some cases, the nanostructures only improved the heat transfer at higher heat fluxes, while at lower heat fluxes, the plain surfaces were comparable or better than the nanostructured surface [12,23].…”

Section: Introductionmentioning

confidence: 99%

Pool boiling of refrigerants over nanostructured and roughened tubes

Bock

Bucci

Markides

et al. 2020

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Pool boiling of refrigerants over nanostructured and roughened tubes

Bock

Bucci

Markides

et al. 2020

International Journal of Heat and Mass Transfer

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“…Its impact can be seen in Fig. 4 as a CHF increase, by more than 100%, on a wicking-inducing surface versus non-wicking conditions on a plain surface 12 34 .…”

Section: Resultsmentioning

confidence: 99%

Nano-inspired fluidic interactivity for boiling heat transfer: impact and criteria

Kim

Choi

Shin

et al. 2016

Sci Rep

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The enhancement of boiling heat transfer, the most powerful energy-transferring technology, will lead to milestones in the development of high-efficiency, next-generation energy systems. Perceiving nano-inspired interface functionalities from their rough morphologies, we demonstrate interface-induced liquid refreshing is essential to improve heat transfer by intrinsically avoiding Leidenfrost phenomenon. High liquid accessibility of hemi-wicking and catalytic nucleation, triggered by the morphological and hydrodynamic peculiarities of nano-inspired interfaces, contribute to the critical heat flux (CHF) and the heat transfer coefficient (HTC). Our experiments show CHF is a function of universal hydrodynamic characteristics involving interfacial liquid accessibility and HTC is improved with a higher probability of smaller nuclei with less superheat. Considering the interface-induced and bulk liquid accessibility at boiling, we discuss functionalizing the interactivity between an interface and a counteracting fluid seeking to create a novel interface, a so-called smart interface, for a breakthrough in boiling and its pragmatic application in energy systems.

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“…In particular, forested silicon nanowires and analogous vertically standing nanostructures have been widely used to enhance heat transfer accompanying phase changes in working fluids and they can lead to extraordinary enhancements of critical heat flux and heat transfer coefficients16254647. Attractive characteristics in heat transfer applications include the fact that nanoscale structures can present an extremely rough interfacial morphology.…”

Section: Resultsmentioning

confidence: 99%

Nano-inspired smart interfaces: fluidic interactivity and its impact on heat transfer

Kim

Lee

et al. 2017

Sci Rep

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Interface-inspired convection is a key heat transfer scheme for hot spot cooling and thermal energy transfer. An unavoidable trade-off of the convective heat transfer is pressure loss caused by fluidic resistance on an interface. To overcome this limitation, we uncover that nano-inspired interfaces can trigger a peculiar fluidic interactivity, which can pursue all the two sides of the coin: heat transfer and fluidic friction. We demonstrate the validity of a quasi-fin effect of Si-based nanostructures based on conductive capability of heat dissipation valid under the interactivity with fluidic viscous sublayer. The exclusive fluid-interface friction is achieved when the height of the nanostructures is much less than the thickness of the viscous sublayers in the turbulent regime. The strategic nanostructures show an enhancement of heat transfer coefficients in the wall jet region by more than 21% without any significant macroscale pressure loss under single-phase impinging jet. Nanostructures guaranteeing fluid access via an equivalent vacancy larger than the diffusive path length of viscid flow lead to local heat transfer enhancement of more than 13% at a stagnation point. Functional nanostructures will give shape to possible breakthroughs in heat transfer and its optimization can be pursued for engineered systems.

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Surface roughening for hemi-wicking and its impact on convective boiling heat transfer

Cited by 45 publications

References 47 publications

Pool boiling of refrigerants over nanostructured and roughened tubes

Pool boiling of refrigerants over nanostructured and roughened tubes

Nano-inspired fluidic interactivity for boiling heat transfer: impact and criteria

Nano-inspired smart interfaces: fluidic interactivity and its impact on heat transfer

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