Micro heat and mass transfer by bubble-trains from the gas discharging at nucleation sites
In this study consideration is given to the possibility of heat and mass transfer from the characteristic columnar bubble-trains observed when a diluted gas precipitates upon contact with nucleation sites at the surface of the container. Last impressive advances in micro/nanoscale surface modificati...
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/371324 |
| Acceso en línea: | https://hdl.handle.net/2117/371324 https://dx.doi.org/10.1016/j.ijheatmasstransfer.2022.123042 |
| Access Level: | acceso abierto |
| Palabra clave: | Heat -- Transmission Heat--Convection Heat transfer enhancement Micro-nano technology Convection Nucleation sites Surface modification Heat and mass transfer enhancement Calor -- Transmissió Calor -- Convecció Àrees temàtiques de la UPC::Física::Termodinàmica::Física de la transmissió de la calor |
| Sumario: | In this study consideration is given to the possibility of heat and mass transfer from the characteristic columnar bubble-trains observed when a diluted gas precipitates upon contact with nucleation sites at the surface of the container. Last impressive advances in micro/nanoscale surface modification start to allow the control -in number, roughness and spacing, of such nucleation sites and with this opening interesting and so far unexplored possibilities for heat and mass transfer. One of them is the kind of convection induced by bubble-trains when a supersaturated gas is discharging at nucleation sites clusters. Because the bubble generation from the nucleation sites is continuous, the bubble-trains are moving in a confined container, and because surfaces may be deliberately coated by design with such nucleation sites, then the constant upward ascent of the fluid entrained by the bubble train eventually set a convective loop driven by the bubble trains. This kind of convection -although expected to be rather small, nevertheless could be of potential interest for microelectronic applications and then it is worthy a first theoretical assessment in the mass and heat transfer enhancement attainable. Utilizing a simplified idealized two-dimensional geometrical model an expression for the upper limit in the Nusselt number was derived and comparison with natural convection performed |
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