Comparison study of liquid replenishing impacts on critical heat flux and heat transfer coefficient of nucleate pool boiling on multiscale modulated porous structures

Li, Calvin H.; Li, T.; Hodgins, Paul; Hunter, Chad N.; Voevodin, Andrey A.; Jones, John G.; Peterson, G. P.

doi:10.1016/j.ijheatmasstransfer.2011.03.062

Cited by 97 publications

(36 citation statements)

References 26 publications

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“…Surface structures that can separate the liquid and vapor flow columns have been studied to delay and even possibly prevent CHF from occurring. 7,11,22 The theory of the wetting limit, the point at which fluid can no longer be supplied to the hot spots on the surface, states that CHF can still occur prior to 117133-9 Rioux, Nolan, and Li AIP Advances 4, 117133 (2014) the coalescence of the vapor columns due to hydrodynamic instability. When the liquid rewetting to the hotspots reaches its limit, CHF will occur.…”

Section: Resultsmentioning

confidence: 99%

“…The liquid was pumped down through the pores in the modulations due to the capillary pressure, separating the vapor and liquid counter flows. Li et al also performed a follow up study 11 to determine CHF enhancement and differentiated the liquid replenishing impacts of flow through the base compared to flow through the modulations. The modulated structures used were pillars in shape, and contained 250µm and 400µm copper particles in either the base or the pillars, creating different porosities and capillary sizes in the base and the vertical pillars.…”

Section: Macroscale Structures -Modulated Porous Coatingsmentioning

confidence: 99%

“…11 The uncertainty of heat flux calculations was performed using equations (2) through (8). The uncertainty was consistently calculated less than 10%.…”

Section: Uncertainty Analysismentioning

confidence: 99%

“…The prediction model used a modulation wavelength, λ m, which is given by Equation (11) and the full prediction model is given in Equation (12):…”

Section: Modulated Porous Prediction Modelmentioning

confidence: 99%

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A systematic study of pool boiling heat transfer on structured porous surfaces: From nanoscale through microscale to macroscale

Rioux

Nolan

2014

AIP Advances

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An experimental study has been conducted to examine the effects of macroscale, microscale, and nanoscale surface modifications in water pool boiling heat transfer and to determine the different heat transfer enhancing mechanisms at different scales. Nanostructured surfaces are created by acid etching, while microscale and macroscale structured surfaces are synthesized through a sintering process. Six structures are studied as individual and collectively integrated surfaces from nanoscale through microscale to macroscale: polished plain, flat nanostructured, flat porous, modulated porous, nanostructured flat porous, and nanostructured modulated porous. Boiling performance is measured in terms of critical heat flux (CHF) and heat transfer coefficient (HTC). Both HTC and CHF have been greatly improved on all modified surfaces compared to the polished baseline. Hierarchical multiscale surfaces of integrated nanoscale, microscale, and macroscale structures have been proven to have the most significant improvements on HTC and CHF. The CHF and HTC of the hierarchical multiscale modulated porous surface have achieved the most significant improvements of 350% and 200% over the polished plain surface, respectively. Experimental results are compared to the predictions of a variety of theoretical models with an attempt to reveal the different heat transfer enhancing mechanisms at different scales. It is concluded that models for the structured surfaces at all scales need to be further developed to be able to have good quantitative predictions of CHFs on structured surfaces.

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Section: Resultsmentioning

confidence: 99%

Section: Macroscale Structures -Modulated Porous Coatingsmentioning

confidence: 99%

“…11 The uncertainty of heat flux calculations was performed using equations (2) through (8). The uncertainty was consistently calculated less than 10%.…”

Section: Uncertainty Analysismentioning

confidence: 99%

“…The prediction model used a modulation wavelength, λ m, which is given by Equation (11) and the full prediction model is given in Equation (12):…”

Section: Modulated Porous Prediction Modelmentioning

confidence: 99%

See 2 more Smart Citations

A systematic study of pool boiling heat transfer on structured porous surfaces: From nanoscale through microscale to macroscale

Rioux

Nolan

2014

AIP Advances

Self Cite

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“…Liter and Kaviany [34] demonstrated that the hydrodynamic limit can be significantly increased using modulated porous structures which provide preferential flow paths for liquid and vapor, thereby reducing the liquid/vapor counterflow situations and aiding non-hydrodynamical determination of the critical instability wavelength. Various other studies also report a significant increase in critical heat flux (CHF) of uniformly coated porous surfaces compared to plain surfaces investigated under natural convection boiling conditions [17,35]. Reasons for this reported enhancement include heat transfer from extended surfaces, an increase in nucleation site density, and enhanced lateral liquid replenishment to the active nucleation sites via capillary action that reduces the liquid-vapor counterflow resistance.…”

Section: Mechanism Of Dryoutmentioning

confidence: 95%

Metal functionalization of carbon nanotubes for enhanced sintered powder wicks

Kousalya

Weibel

Garimella

et al. 2013

International Journal of Heat and Mass Transfer

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Phase change cooling schemes involving passive heat spreading devices, such as heat pipes and vapor chambers, are widely adopted for thermal management of high heat-flux technologies. In this study, carbon nanotubes (CNTs) are fabricated on a 200 μm thick sintered copper powder wick layer using a microwave plasma enhanced chemical vapor deposition technique. A physical vapor deposition process is used to coat the CNTs with a varying thickness of copper to promote surface wetting with the working fluid, water. Thermal performance of the bare sintered copper powder sample (without CNTs) and the copper-functionalized CNT-coated sintered copper powder wick samples is compared using an experimental facility that simulates the capillary fluid feeding conditions of a vapor chamber. A notable reduction in the boiling incipience superheat is observed for the nanostructured samples. Additionally, nanostructured samples having a thicker copper coating provided a considerable increase in dryout heat flux, supporting heat fluxes up to 457 W/cm 2 from a 5 mm × 5 mm heat input area, while maintaining lower surface superheat temperatures compared to a bare sintered powder sample; this enhancement is attributed primarily to the improved surface wettability. Dynamic contact angle measurements are conducted to quantitatively compare the surface wetting trends for varying copper coating thicknesses and confirm the increase in hydrophilicity with increasing coating thickness.

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Laser Surface Engineering for Boiling Heat Transfer Applications

Zupančič

Gregorčič

2021

Materials With Extreme Wetting Properties

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Nucleate boiling is inseparably connected with our everyday life. It is not only utilized in simple tasks like cooking, but it is also important for applications on various scales, ranging from enormous nuclear power plants to miniature microelectronics. This widespread integration is the result of its ability for effective heat transfer at low temperature differences between the heated surface and the surrounding fluid. The surface wettability undoubtedly influences the boiling heat transfer, but the observed behaviour cannot be explained without taking into account the surface topography and chemical modifications due to intense boiling processes. This chapter demonstrates how nucleate boiling enhancement can be achieved on surfaces with various wetting properties and specific micro/nano topographical features, fabricated using a straightforward, robust and scalable laser texturing approach. We discuss the basics of nucleate boiling and how it is affected by surface wettability; provide a fundamental background of laser surface engineering and its ability to achieve extreme wetting properties; and finally demonstrate the applicability of the laser-textured surfaces in enhancing and controlling nucleate pool boiling of different fluids. We show how laser surface engineering decreases the wettability effects on the key boiling parameters andin this wayensures more stable heat transfer performance.

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Comparison study of liquid replenishing impacts on critical heat flux and heat transfer coefficient of nucleate pool boiling on multiscale modulated porous structures

Cited by 97 publications

References 26 publications

A systematic study of pool boiling heat transfer on structured porous surfaces: From nanoscale through microscale to macroscale

A systematic study of pool boiling heat transfer on structured porous surfaces: From nanoscale through microscale to macroscale

Metal functionalization of carbon nanotubes for enhanced sintered powder wicks

Laser Surface Engineering for Boiling Heat Transfer Applications

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