Nucleation site density in pool boiling of saturated pure liquids: Effect of surface microroughness and surface and liquid physical properties

Benjamin, Ronald; Balakrishnan, A.

doi:10.1016/s0894-1777(96)00168-9

Cited by 208 publications

(52 citation statements)

References 30 publications

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“…Since bubble nucleation and the onset of nucleate boiling (ONB) depend strongly on the properties of the working fluid [3,[38][39][40][41], the present study investigates the effect of the introduction of free copper particles on boiling of water, which has drastically different thermophysical properties compared to FC-72. The experiments show a particle size range of 3 mm to 6 mm is optimum for water with its high surface tension.…”

Section: Introductionmentioning

confidence: 99%

Investigation of boiling heat transfer in water using a free-particles-based enhancement technique

Kim

Garimella

2014

International Journal of Heat and Mass Transfer

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Enhancement of pool boiling heat transfer in water by means of the introduction of free particles on the heated surface is investigated. The layer of loose particles on the heated surface is free to move and deform under the action of bulk liquid convection and vapor nucleation. High-speed visualizations show that bubble nucleation preferentially occurs at the narrow corner cavities formed between the free particles and the heated surface. The effects of the number and size of the free particles are experimentally explored using copper particles over a wide size range from tens of nanometers to 13 mm.Experimental results show that a mixture of free particle diameters of 3 mm and 6 mm provides the greatest improvement in boiling heat transfer, resulting in an average increase in heat transfer coefficient of 115% relative to a baseline polished surface without particles. A numerical heat transfer simulation and an analytical force balance model are developed to predict nucleation incipience and explain the parametric trends in boiling performance observed in the presence of the free particles.

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Section: Introductionmentioning

confidence: 99%

Investigation of boiling heat transfer in water using a free-particles-based enhancement technique

Kim

Garimella

2014

International Journal of Heat and Mass Transfer

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“…The results obtained by Wang et al (9) showed that the preferred bubble formation occurs at the edge of PTFE hydrophobic spot because the edge presented has a higher roughness than central region. As is well known the increase in surface roughness would increase the number of nucleation sites per unit area (10) and resultingly a boiling heat transfer (11) .…”

Section: Introductionmentioning

confidence: 99%

Effects of Hydrophobic-Spot Periphery and Subcooling on Nucleate Pool Boiling from a Mixed-Wettability Surface

Suroto

Tashiro

Hirabayashi

et al. 2013

JTST

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The effect of subcooling and length of hydrophobic-spot periphery on nucleate pool boiling heat transfer from TiO 2 -coated surface with and without PTFE (polyetatafluoroethylene) hydrophobic circle spots at intermediate heat flux has been examined. The experiments are performed with liquid subcooling ranging from 0-20 K and heat transfer block used were TiO 2 -coated copper block with a PTFE hydrophobic circle spot with various diameters with total area of PTFE being constant. Bubble nucleation and behavior were observed by using high-speed camera. The results showed that the heat transfer performance of surfaces with PTFE hydrophobic circle spot is better than superhydrophilic surface in overall condition. Furthermore, the heat transfer performance decreases under subcooled condition for all surfaces. Increase in peripheral length of hydrophobic-spot enhances the heat transfer performance.

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“…The wettability and surface structure of a heating surface affect bubble initiation, [5][6][7] bubble dynamics, 8,9 and nucleation site density. 10 Mikic and Rohsenow 11 developed a well-known boiling correlation by considering the effects of surface wettability and geometric constraints to derive a boiling heat transfer (BHT) coefficient. Surface characteristics also affect the critical heat flux (CHF), representing the limit of nucleate boiling; the CHF is enhanced by surface characteristics that influence force balance or liquid supplement.…”

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confidence: 99%

Boiling on spatially controlled heterogeneous surfaces: Wettability patterns on microstructures

Noh

et al. 2015

Applied Physics Letters

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We investigated nucleate boiling heat transfer with precisely controlled wetting patterns and micro-posts, to gain insights into the impact of surface heterogeneity. To create heterogeneous wetting patterns, self-assembled monolayers (SAMs) were spatially patterned. Even at a contact angle <90°, bubble nucleation and bubble frequency were accelerated on SAM patterns, since this contact angle is larger than that found on plain surfaces. Micro-posts were also fabricated on the surface, which interrupted the expansion of generated bubbles. This surface structuring induced smaller bubbles and higher bubble frequency than the plain surface. The resistance provided by surface structures to bubble expansion broke the interface between the vapor mushroom and the heating surface, and water could therefore be continuously supplied through these spaces at high heat flux. To induce synergistic effects with wetting patterns and surface structures on boiling, we fabricated SAM patterns onto the heads of micro-posts. On this combined surface, bubble nucleation was induced from the head of the micro-posts, and bubble growth was influenced by both the SAM pattern and the micro-post structures. In particular, separation of the vapor path on the SAM patterns and the liquid path between micro-post structures resulted in high heat transfer performance without critical heat flux deterioration.

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Nucleation site density in pool boiling of saturated pure liquids: Effect of surface microroughness and surface and liquid physical properties

Cited by 208 publications

References 30 publications

Investigation of boiling heat transfer in water using a free-particles-based enhancement technique

Investigation of boiling heat transfer in water using a free-particles-based enhancement technique

Effects of Hydrophobic-Spot Periphery and Subcooling on Nucleate Pool Boiling from a Mixed-Wettability Surface

Boiling on spatially controlled heterogeneous surfaces: Wettability patterns on microstructures

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