Ultrahigh Flux Thin Film Boiling Heat Transfer Through Nanoporous Membranes

Wang, Qingyang; Chen, Renkun

doi:10.1021/acs.nanolett.8b00648

Cited by 88 publications

(49 citation statements)

References 48 publications

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“…It can be seen from Figure 2 that for all of the fluids tested in this work, the curves display a small-slope regime at low heat fluxes, which represents the well-known pool boiling regime, as shown previously [40,41]. This is because at low heat fluxes, the liquid flow across the membrane driven by the pressure difference ( − ) was much larger than the vaporization flux, which resulted in a thick liquid puddle on top of the membrane and led to heat transfer behavior similar to pool boiling.…”

Section: Pcht Experiments and Heat Transfer Curvessupporting

confidence: 80%

“…Experimental data for water from Ref. [40] are also included. The model of transition for water calculated using Eq.…”

Section: Resultsmentioning

confidence: 99%

“…The experimental system, as shown Supplementary Information Figure S2, and the data reduction method used in this work have been employed in our previous studies [40,41]. Here we summarize the main features of the system for completeness and readability.…”

Section: Methodsmentioning

confidence: 99%

“…the measured voltage and current represented the resistance of the heater and was used to obtain the sample temperature using the pre-calibrated temperature coefficient of resistivity (TCR) of the Pt film. Detailed sample preparation procedure, experimental procedure, data reduction method, and the uncertainty analysis can be found in our previous work [40]. Figure 1a shows the schematic for thin film boiling as we recently reported [40,41].…”

Section: Methodsmentioning

confidence: 99%

“…Detailed sample preparation procedure, experimental procedure, data reduction method, and the uncertainty analysis can be found in our previous work [40]. Figure 1a shows the schematic for thin film boiling as we recently reported [40,41]. The concept is to supply the liquid through a porous membrane and form a thin liquid film on top of the membrane, and the thermal resistance of conduction inside liquid phase is effectively reduced due to the small thickness of the liquid film.…”

Section: Methodsmentioning

confidence: 99%

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Transition between thin film boiling and evaporation on nanoporous membranes near the kinetic limit

Wang

Shi

Chen

2020

International Journal of Heat and Mass Transfer

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Nanoporous structures including single nanopores and nanoporous membranes have beenutilized as a platform to study fundamental liquid-vapor phase change heat transfer (PCHT) processes as well as a promising candidate for high flux heat dissipation. Previously, we implemented nanoporous membranes to support a thin liquid film for boiling, which was termed "thin film boiling", and realized high heat transfer performance. Besides thin film boiling, thin film evaporation through nanoporous structures have also been demonstrated to achieve high heat flux, but these two mechanisms are usually considered two mutually exclusive regimes operated under vastly different conditions, and the factors dictating how close the PCHT process is to the kinetic limit are elusive. In this work, we utilized a unique transition between thin film boiling and evaporation through nanoporous membranes to clarify the factors determining the heat flux and heat transfer coefficient (HTC) with respect to the kinetic limit conditions. We unambiguously showed the controllable transition from boiling to evaporation, when the liquid receded into the nanopores and provided additional driving force from capillary pumping sustained in the nanoscale pores. We showed that this transition is universal and can be understood from a simple fluid transport model for all the four types of fluids we studied, which cover a wide span of surface tension (water, ethanol, IPA, FC-72). More importantly, PCHT conditions at the transition points between boiling and evaporation were close to those of the kinetic limit of all these fluids. However, further increase of the heat flux beyond the transition points led to decreasing HTC and deviation from the kinetic limit, which can be attributed to the increasing vapor resistance in the vapor space and inside the nanopores. This increasing vapor resistance was also confirmed by experiments on IPA with different vapor pressures. Our work could shed light on PCHT on nanoporous structures with respect to the kinetic limit, and could advance the development of high heat-flux heat dissipation devices, especially using dielectric fluids.

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Section: Pcht Experiments and Heat Transfer Curvessupporting

confidence: 80%

“…Experimental data for water from Ref. [40] are also included. The model of transition for water calculated using Eq.…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Transition between thin film boiling and evaporation on nanoporous membranes near the kinetic limit

Wang

Shi

Chen

2020

International Journal of Heat and Mass Transfer

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Endoscopic Visualization of Contact Line Dynamics during Pool Boiling on Capillary‐Activated Copper Microchannels

Zhu²,

Kang

et al. 2020

Adv Funct Materials

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Microchannel surfaces are common to microfluidics, biofluidics, thermal management, and energy applications. Due to processing limitations for the majority of metallic materials, the majority of hyperfine microchannels used in microfluidics and thermo‐fluids are fabricated on non‐metallic substrates, for example, silicon and polydimethylsiloxane. Here, a technique to fabricate ultrasmall microchannels on arbitrary metallic materials is developed using photolithography in combination with electrochemical deposition. The technique is used to prepare copper microchannels and to investigate the pool boiling heat transfer performance with a focus on the three‐phase contact line dynamics. The hydrodynamics of nucleating bubbles during boiling are observed in situ using in‐liquid endoscopy. The results show that the variation of critical heat flux enhancement has a linear relationship with the contact line increase ratio. The scalable microchannel surfaces exhibit superior heat transfer performance with a maximum heat transfer coefficient) enhancement of 930% with ultra‐low wall superheat of 5 °C. This work not only develops a scalable manufacturing method to develop ultra‐small microchannels on metallic materials, it outlines design guidelines for structure optimization of pool boiling heat transfer for temperature sensitive applications, such as electronics thermal management.

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Molecular Dynamics Simulation of Nanofilm Boiling on Graphene‐Coated Surface

Tang

Zhang

Lin

et al. 2019

Advcd Theory and Sims

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Molecular dynamics (MD) simulations are conducted to investigate the effect of graphene coating on nanofilm boiling on an atomically smooth surface. Transition of boiling modes from normal evaporation to explosive boiling is observed on both bare and graphene-coated surfaces. The onset temperature of explosive boiling on the graphene-coated surface is approximately 170 K, which is extremely close to the value of approximately 160 K on the bare surface. A hydrophobic surface is also artificially fabricated to verify the effect of surface wettability on nanofilm boiling and the significance of graphene coating. The onset temperature of explosive boiling on the hydrophobic surface is much higher than that on the hydrophilic and graphene-coated surfaces. Additionally, the critical heat flux of the nanofilm boiling on the graphene-coated surface is slightly lower than that on the bare hydrophilic surface. Results confirm that graphene coating is almost useless, and even harmful to the heat transfer enhancement of the nanofilm boiling. Simulation MethodThree simulation systems, namely hydrophilic Cu, hydrophobic Cu, and graphene-coated Cu systems, are developed and shown in Figure 1. The initial configurations of the three systems are cuboid confinements with the same size of 8.39 nm (x) × 9.68 nm

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Ultrahigh Flux Thin Film Boiling Heat Transfer Through Nanoporous Membranes

Cited by 88 publications

References 48 publications

Transition between thin film boiling and evaporation on nanoporous membranes near the kinetic limit

Transition between thin film boiling and evaporation on nanoporous membranes near the kinetic limit

Endoscopic Visualization of Contact Line Dynamics during Pool Boiling on Capillary‐Activated Copper Microchannels

Molecular Dynamics Simulation of Nanofilm Boiling on Graphene‐Coated Surface

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