Date of Award


Degree Name

Bachelor of Science


Paper Science and Engineering


The purpose of this project was to determine if pressure drop in a static mixer can be related to pulp consistency in the 2-4% range. If this relationship can be found, it would be possible to use the static mixer as a consistency sensor. Consistency measurement is one of the most difficult variables to measure and control in the pulp and paper mill. Any sensor which would improve reliability and accuracy of consistency measurement would be worthwhile.

The results of this project indicate that the use of pressure drop across a static mixer is not a practical method of consistency sensing. The device was very sensitive to f low rate variations, a fact which is difficult to compensate for with the static mixer. The mixer pressure drop also appeared to vary with pulp species.

Further work should be done in this area using equipment more suited for higher consistencies. More runs should be done for each species type. Also, a more precise type of pressure drop measurement should be devised. Finally, a better means of mixing the dilution water should be used in order to maintain a more uniform consistency in the stock chest.