Boiling heat transfer from surfaces with porous layers

Afgan, Naim; Jovic, L.; Kovalev, S. A.; Lenykov, Victor A.

doi:10.1016/0017-9310(85)90074-2

Cited by 72 publications

(23 citation statements)

References 2 publications

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“…For all pore sizes investigated from 119-232 μm, the superheat dependence on heat flux was linear in the boiling regime, as observed previously for pool boiling from porous surfaces [19]. A definitive decrease in the capillary-fed boiling thermal resistance was observed with decreasing pore size, and was attributed to an increase in the effective heat transfer area [33].…”

Section: Sintered Screen Meshsupporting

confidence: 82%

“…Submerged pool boiling from porous surfaces has been extensively characterized for a number of surface geometries, working fluids, and flooded porous wick structures often found in heat pipes [15][16][17][18][19][20][21][22][23][24][25][26][27][28]. The fundamental mechanism of heat transfer during boiling from a porous surface submerged in a liquid pool differs from that from a wick that is passively fed by capillary action.…”

Section: Nucleate Boiling In Porous Wick Structuresmentioning

confidence: 99%

“…Water has a comparatively higher surface tension, and therefore tends to form stable nucleation sites at lower superheats than highly wetting fluids. This translates into measured incipience superheats of ~10 °C from smooth surfaces [78] and less than 1.5 °C for pool boiling of water from sintered porous surfaces [19,80].…”

Section: Incipience Of Boiling Under Capillary-fed Conditionsmentioning

confidence: 99%

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Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Weibel

Garimella

2013

Advances in Heat Transfer

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Owing to their high reliability, simplicity of manufacture, passive operation, and effective heat transport, flat heat pipes and vapor chambers are used extensively in the thermal management of electronic devices. The need for concurrent size, weight, and performance improvements in high-performance electronics systems, without resort to active liquid-cooling strategies, demands passive heat spreading technologies that can dissipate extremely high heat fluxes from small hot spots. In response to these daunting application-driven trends, a number of recent investigations have focused on the design, characterization, and fabrication of ultra-thin vapor chambers for proximate heat spreading away from these hot spots. The predominant transport mechanisms and operational limits have been found to be different under these conditions relative to conventional low-power heat pipes. Noteworthy advances in the fundamental understanding of evaporation and boiling from porous microstructures fed by capillary action, and improvements in vapor chamber characterization, modeling, design, and fabrication techniques are reviewed. Characterization of evaporation and boiling from idealized and realistic wick structures, observation of vapor formation regimes as a function of operating conditions, assessment of fluid dryout limitations, design of novel multi-scale and nanostructured wicks for enhanced transport, and incorporation of these high heat flux transport phenomena into device-level models are discussed. These recent developments have successfully extended the maximum operating heat flux limits of vapor chambers.2

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Section: Sintered Screen Meshsupporting

confidence: 82%

Section: Nucleate Boiling In Porous Wick Structuresmentioning

confidence: 99%

Section: Incipience Of Boiling Under Capillary-fed Conditionsmentioning

confidence: 99%

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Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Weibel

Garimella

2013

Advances in Heat Transfer

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“…This phenomenon can be explained, as in the case of porous structures, by an internal boiling crisis [9] associated with a low permeability of smallest-diameter pores. The literature offers numerous hypotheses related to the mechanism of interlayer boiling crisis.…”

Section: Type-i Hysteresismentioning

confidence: 99%

“…Afgan and Kovalev [9] claim that the interlayer boiling crisis begins when stable circulation of fluid to the heating surface is stopped by a porous layer. This happens when the accumulative drop in pressure at the vapor and liquid flow in the structure is higher than the pressure capillary gain [1].…”

Section: Type-i Hysteresismentioning

confidence: 99%

Hysteresis of boiling for different tunnel-pore surfaces

Pastuszko

Piasecka

2015

EPJ Web of Conferences

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Abstract. Analysis of boiling hysteresis on structured surfaces covered with perforated foil is proposed. Hysteresis is an adverse phenomenon, preventing high heat flux systems from thermal stabilization, characterized by a boiling curve variation at an increase and decrease of heat flux density. Experimental data were discussed for three kinds of enhanced surfaces: tunnel structures (TS), narrow tunnel structures (NTS) and mini-fins covered with the copper wire net (NTS-L). The experiments were carried out with water, R-123 and FC-72 at atmospheric pressure. A detailed analysis of the measurement results identified several cases of type I, II and III for TS, NTS and NTS-L surfaces.

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Natural convective boiling in vertical annular tubes filled with porous medium

Liu

Chen

2000

Heat Trans. Asian Res.

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Experimental and theoretical studies were carried out on the natural convective boiling heat transfer and critical heat flux (CHF) in uniformly heated vertical annular tubes filled with a porous medium and submerged in saturated water and R11 liquid. The heat transfer experimental results were compared with the case without a porous medium. It was shown that heat transfer is greatly enhanced by the porous medium in the region of low heat flux. By adopting a simple mixing flow model, a generalized approximate relationship was derived for predicting the CHF. The prediction agrees relatively well with the CHF experimental data.

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Boiling heat transfer from surfaces with porous layers

Cited by 72 publications

References 2 publications

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Hysteresis of boiling for different tunnel-pore surfaces

Natural convective boiling in vertical annular tubes filled with porous medium

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