Steady-state transition boiling on thin wires in liquid nitrogen. The role of Taylor wavelength
✍ Scribed by Marie-Christine Duluc; Maurice-Xavier François
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 236 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
Transition boiling on a thin wire in liquid nitrogen is investigated. Results presented in the form of a classical boiling curve exhibit some discontinuous branches in the mixed boiling region, located between the negative slope area and the film boiling regime. A model is proposed in order to explain this new feature. It is based on steady coexistence of two areas, one in nucleate and one in film boiling. The main hypothesis concerns the wire length covered with film boiling which is supposed to be a multiple of the Taylor wavelength, this last quantity being commonly regarded as the interval separating two neighbouring vapour pockets in the film boiling regime. The temperature of each area is allowed to vary in a range compatible with the respective regime. The comparison with experimental results shows that some branches develop with a constant proportion of each regime. Furthermore, this model shows that no steady branch is observed when the wire length covered with film boiling is less than one Taylor wavelength. The only experimental points occurring in this case are those located in the negative slope area.