Pressure drop characteristics of a splashplate nozzle

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Volume Title
School of Engineering | Master's thesis
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Date
2013
Major/Subject
Energiatekniikka
Mcode
Ene-47
Degree programme
Language
en
Pages
(11) + 73 s. + liitt. 8
Series
Abstract
The objective of this work was to study the flow phenomena in splashplate nozzles experimentally. Water was used at normal temperature instead of black liquor to avoid flashing effects. The pressure loss caused by variables such as area reduction, plate distance and plate angle were measured. The hydraulic resistance coefficient was calculated from the measured pressure loss and its relationship to other variables was expressed as a mathematical equation. The background research work comprised of the study of craft chemical process, key parameters for black liquor spray, splashplate nozzle, black liquor and its properties. Using Bernoulli's theorem, the relationship between pressure drop and hydraulic resistance coefficient was derived. In line with the main objective of this work, experiments were planned and executed. The analyses of the results shows that the higher mass flow rates produced minimum hydraulic resistance coefficient values and it influenced the results of other variables. The bigger plate angle up to 90 degrees caused maximum hydraulic resistance coefficient values. Moreover the contour between plate angle and hydraulic resistance coefficient suggests an exponential or sinusoidal trend. The smaller plate distances resulted in maximum values of hydraulic resistance coefficient. Furthermore the profile between plate distance and hydraulic resistance coefficient suggests an exponential trend. The bigger area reduction caused maximum hydraulic resistance coefficient values at lower mass flow rates but it changed its trend gradually towards opposite direction from lower mass flow rate to higher. Moreover the contour between them suggests a trend of straight line. Based on the analysis and with the help of model based curve fitting from MATLAB software, two mathematical equations are suggested. This aids the calculation of hydraulic resistance coefficient called predicted data which is in good agreement with the experimental data at higher hydraulic resistance coefficient values of above 1 or higher plate angles of above 30 degrees. The results are encouraging and promising to extend this work in future by using black liquor.
Description
Supervisor
Järvinen, Mika|Harvey, Simon
Thesis advisor
Kankkunen, Ari
Saeed, Loay
Keywords
splashplate nozzle, pressure drop, hydraulic resistance coefficient
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