DISJOINING PRESSURE EFFECT ON THE WETTING CHARACTERISTICS IN A CAPILLARY TUBE
| Autor: | H. B. Ma G. P. Peterson D. M. Pratt |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Capillary action Mechanical Engineering Materials Science (miscellaneous) Disjoining pressure Mechanics Condensed Matter Physics Atomic and Molecular Physics and Optics Condensed Matter::Soft Condensed Matter Physics::Fluid Dynamics Surface tension Contact angle Heat flux Mechanics of Materials Heat transfer Fluid dynamics General Materials Science Wetting |
| Zdroj: | Microscale Thermophysical Engineering. 2:283-297 |
| ISSN: | 1091-7640 1089-3954 |
| DOI: | 10.1080/108939598199928 |
| Popis: | A mathematical model capable of predicting the wicking height formed by a wetting liquid in a vertical, heated capillary tube was developed. The model incorporates the disjoining pressure, the fluid flow and heat transfer in the thin film region, and the thermocapillary effects. Evaluation of the modeling predictions indicates the meniscus radius of curvature at the vapor - liquid interface increases significantly with increasing heat flux, resulting in an increase in the contact angle due to the surface tension variation, disjoining pressure, and fluid flow in the evaporating thin film. The increase in the contact angle is shown to be the principal reason that the static wicking height in capillary tubes is typically greater than the dynamic wicking height observed during dynamic flow conditions. In addition to the individual contributions of the dynamic flow effect and the contact angle variation, both of these parameters are presented and discussed as a function of the tube diameter. In order to verify... |
| Databáze: | OpenAIRE |
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