Heat transfer enhancement in pool boiling of a refrigerant fluid with wire nets structures

Franco, Alessandro; Latrofa, Enrico Maria; Yagov, V. V.

doi:10.1016/j.expthermflusci.2005.07.002

Cited by 27 publications

(20 citation statements)

References 19 publications

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“…The inside of the tunnels is filled with vapor, except for a thin liquid film at the micro-fins walls and in menisci, from where the liquid is evaporated in cycles. Such a surface type provides a lot of additional nucleation sites and additional capillary pressure for liquid inflow [4] into the space between micro-fins under the mesh. A different boiling mechanism occurs on mesh points which are in a direct contact with micro-fin tips, where mesh temperature is higher and nucleation sites become activated at small superheats and heat fluxes.…”

Section: Micro-fins With Wire Meshmentioning

confidence: 99%

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Pool boiling on micro-fin array with wire mesh structures

Pastuszko

2010

International Journal of Thermal Sciences

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Section: Micro-fins With Wire Meshmentioning

confidence: 99%

“…The overall heat transfer coefficient was defined by [2] as: a ext ¼ a 4 (4) where 4 is a surface extension coefficient (¼A ext /A b ).…”

Section: Comparison With Similar Structuresmentioning

confidence: 99%

Pool boiling on micro-fin array with wire mesh structures

Pastuszko

2010

International Journal of Thermal Sciences

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“…The artificial nucleation site can be achieved by creating different surface conditions belonging to four groups: mechanical workout, attached promoters, porous coating, and artificial roughness (Memory, Sugiyama, and Marto 1995;Franco, Latrofa, and Yagov 2006). In the above methods, an effective way to obtain heat transfer enhancement is to use porous structure.…”

Section: Introductionmentioning

confidence: 98%

Experimental Investigations of Pool Boiling Heat Transfer on Horizontal Plate Sintered with Metallic Fiber Felt

Huang

et al. 2012

International Journal of Green Energy

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In this study, pool boiling heat transfer performance of de-ionized water on horizontal plates sintered with copper fiber of various geometries was experimentally investigated under atmospheric pressure. Copper fiber felt with different structural parameters was proposed to provide artificial nucleate sites to improve heat transfer performance. A high-speed camera was used to photograph bubble growth processes. Pool boiling curves were obtained. Effects of fiber felt porosity and fiber diameter on the onset of nucleate boiling (ONB) and boiling heat transfer coefficient were investigated. It was revealed that copper fiber felt surfaces can reduce wall superheat at boiling incipience and exhibit significant enhancement of heat transfer compared with smooth surface. The influence of porosity on heat transfer performance for metal fiber felts was more sensitive than fiber diameter. A bubble with an average diameter of less than 0.3 mm was defined as a small-sized bubble (SSB) from visualization photograph by high-speed camera, and pool boiling heat transfer performance was highly dependent on the percentage of small-sized bubbles (PSSB) to help illustrate enhancement mechanisms between bubble size distribution and boiling heat transfer performance. Smaller mean pore diameter can be achieved through decreasing either porosity or fiber diameter, as it allowed the fiber felt to create stronger capillary force to form bigger size bubble and lower PSSB to result in improved heat transfer coefficient.

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“…It was found that the application of a single mesh layer resulted in enhanced heat transfer in comparison with the smooth reference surface at temperature differences above 6 °C. The experimental tests of refrigerant R141b boiling conduced on the heating surface covered with copper, aluminium, brass and stainless steel mesh structures, analysed in (Franco et al 2006), showed that mesh layers of small aperture enhance heat transfer in comparison with the smooth surface for low heat fluxes. According to the authors, heat transfer performance is influenced by structure thickness (number of layers).…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement in Phase-Change Heat Exchangers

2014

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The paper presents the results of boiling heat transfer enhancement due to the application of additional mesh on the heat exchanger surface. The copper mesh of porosity of 75% was sintered to the copper heater producing strong bonds between the elements. The results indicate a possibility of significant improvement of heat transfer conditions in comparison to the smooth surface. The heat flux was found to be almost six times higher for the same superheat if the mesh structure was applied. Distilled water and ethanol were the working fluids. The investigations were performed under atmospheric pressure.

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Heat transfer enhancement in pool boiling of a refrigerant fluid with wire nets structures

Cited by 27 publications

References 19 publications

Pool boiling on micro-fin array with wire mesh structures

Pool boiling on micro-fin array with wire mesh structures

Experimental Investigations of Pool Boiling Heat Transfer on Horizontal Plate Sintered with Metallic Fiber Felt

Heat Transfer Enhancement in Phase-Change Heat Exchangers

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