| Journal: | Ingeniería mecánica, tecnología y desarrollo |
| Database: | PERIÓDICA |
| System number: | 000456022 |
| ISSN: | 1665-7381 |
| Authors: | Escobar Vargas, S1 González, J. E1 Fabris, D1 Sharma, R2 Bash, C2 Ruiz, O. E3 |
| Institutions: | 1Santa Clara University, Santa Clara, California. Estados Unidos de América 2Hewlett Packard, Palo Alto, California. Estados Unidos 3University of Puerto Rico, San Juan, Puerto Rico. Puerto Rico |
| Year: | 2007 |
| Volumen: | 2 |
| Number: | 4 |
| Pages: | 139-144 |
| Country: | México |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico |
| English abstract | The microboiling in confined spaces is characterize through bubble area measurement for enclosed small planar heaters (41miliicras x 45 milimicras). A lase visualization technique is used to measure the bubble area viewed from above. The bubbles are generated in deionized water by heating pulses of power inputs (2.6 - 3.7 W) and total energy releases (8.6 - 13.9 microJoules) The bubble lifecycles lasts for 10 - 16 microS. Direct observations of bubble area show a rapid bubble film growth followed by a volumetric growth, subsequent collapse and bubble regrowth. The bubble vapor pressure, generated mechanical power, and bubble efficiencies at different energy and heating rate conditions were calculated using a hemispherical cap model for the bubble. The two characteristic lenghts r1 and r2 of the hemispherical cap relate the extent of the film and the volumetric growth. The effective radius of the bubble as viewed from above, was fitted with a linear growth rate during the film growth phase. As the bubbles reaching the maximum area, the effective radius of the volume was approximated by a either a linear radial growth rate, t,or a square root growth rate, t1/2 potence. Using this model pressure calculations result in alues up to 400 x 10 at 3 potence Pa and conversion efficiency to mechanical work up to 0. 20 % |
| Disciplines: | Física |
| Keyword: | Termodinámica y física estadística, Burbujas, Ebullición, Formación de burbujas, Intercambio de calor |
| Keyword: | Boiling, Bubble formation, Bubbles, Heat transfer |
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