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Non-evaporating black liquor falling film hydrodynamics

Miriam Johansson (Institutionen för energi och miljö, Värmeteknik och maskinlära) ; Lennart Vamling (Institutionen för energi och miljö, Värmeteknik och maskinlära) ; Lars Olausson
Nordic Pulp and Paper Research Journal (0283-2631). Vol. 24 (2009), 1, p. 38-45.
[Artikel, refereegranskad vetenskaplig]

Knowledge of wave behaviour is a key factor for understanding heat transfer in falling film evaporators. Here the industrially important fluid black liquor has been examined, together with water which has been used as a reference. Notable results are that there are large local fluctuations in the film thickness; for instance at a Re number of 4100 in the black liquor falling film, the thickness varies between 0.2 and 8.0 mm. For the water falling film, both correlations (Brotz and Brauer) are mostly within the 95% confidence interval of the measured average film thickness. The black liquor film tends to be thicker than the film thickness calculated with the correlations, especially for higher Re numbers.

Nyckelord: Black liquor, Evaporator, Falling film, Film thickness, Hydrodynamics

Denna post skapades 2010-01-18. Senast ändrad 2016-04-07.
CPL Pubid: 108637


Institutioner (Chalmers)

Institutionen för energi och miljö, Värmeteknik och maskinlära (2005-2014)


Kemisk energiteknik
Kemiska processer

Chalmers infrastruktur