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Evaluation of a static mixer for hot gas in MDF drying systems
2004 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Two main issues: stratification and pressure drop in a static mixer for cold air and hot flue gases in an MDF process were investigated and three proposals to enhance mixing by modification of the geometry were evaluated. All conclusions are based on the results from the numerical modelling that was performed. The results from the numerical modelling of the static mixer clearly show that stratification is prevalent and that modifications are necessary in order to fulfil the requirements of a uniform temperature distribution at the outlet. Two different principles are proposed in order to reduce stratification, The first is based on using guide vanes in combination with four or seven restrictors. The results show that using guide vanes will give a more homogeneous distribution of the hot gases. If only four restrictors with the original dimensions are being used, this modification would still not be sufficient to reduce the stratification, consequently the number of restrictors has to be increased. Increasing the number of restrictors to seven reduces stratification but the temperature distribution would still not be satisfactory. The second is based on increasing the number of splitter plates. The achieved temperature distribution showed to be more uniform than for the other geometry evaluated but with the drawback of a pressure drop 2-3 times higher than the former geometry. The conclusion is that stratification is strongly reduced by the combination of guide vanes and extra splitter plates but some kind of modification of the proposed geometry has to be made in order to fulfil the requirements of a uniform temperature distribution.

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Keyword [en]
Keyword [sv]
URN: urn:nbn:se:ltu:diva-57770ISRN: LTU-EX--04/001--SELocal ID: e65a1813-8334-4e20-9218-7a05b770eae0OAI: diva2:1031158
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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