Characterization & Optimization of Flow Properties in a Micro-Distillation Device

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Characterization and Optimization of Flow Properties in a Micro-distillation device Master Thesis submitted in partial fulfillment of the requirements for the degree

MASTER OF SCIENCE in CHEMICAL AND PROCESS ENGINEERING
By Dhananjay Mote Advisor: Dr.-Ing. Chafika Adiche Ait Aissa Supervisor: Prof. Dr. -Ing. habil. Kai Sundmacher

Faculty of Process Systems Engineering Otto-von-Guericke University, Magdeburg, Germany and Max-Planck Institute for Dynamics of Complex Technical Systems Magdeburg, Germany October 2010

ACKNOWLEDGEMENTS
I would like to express my gratitude to Max Planck Institute for dynamics of complex technical systems and Otto-von-Guericke University-Magdeburg for providing financial support and facilities for this project. I wish to thank my thesis adviser, Dr.-Ing. Chafika Adiche Ait Aissa for her enthusiastic technical support and guidance. Her patience and attention to detail go beyond description. I would also like to thank Prof. Dr.-Ing. Kai Sundmacher for allowing me to conduct my thesis work here. There are many people at Max Planck institute who helped me on this project. Thorsten Shroeder provided guidance on forming the experimental set-up. MPI workshop people made invaluable contribution for assistance in the fabrication of the micro-separator. Markus Ikert supported all laboratory activities. I would also like to thank my colleagues Kashif Hussain and Tariq Bhatti for their helpful suggestions and support. I wish to thank my family and friends for their emotinal support and showing belief in me.

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Declaration of Originality

Hereby I, Dhananjay Mote, certify that the presented thesis work titled “Characterization and Optimization of Flow Properties in a Micro-distillation device” was done by me. Materials obtained from other sources have been duly acknowledged in the thesis. Magdeburg, 22.10. 2010

_______________________ Dhananjay Mote

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Statuary declaration: I agree to the assignment given in this master thesis

Magdeburg, the

Mote, Dhananjay

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Abstract
A fluid dynamics study has been performed on a novel micro-distillation device. Task was to characterize and optimize the fluid flow to benefit the overall process of evaporation. Detailed literature review regarding fluid dynamical aspects gave a good overview of the useful correlations. CFD simulation was performed with COMSOL Multiphysics software. Due to thin parts, convergence of the solution posed problems. With the help of innovative meshing coupled with appropriate solver settings, the issue was resolved. Results gave good insight into the fluid flow behaviour of the feed channel. In experimental investigation pressure drop and permeate flux was recorded at 50 °C for each case with changing feed flow rate while all other parameters were kept constant. Permeate flux was found to be affected by channel shape, height and membrane contactor used. As expected, lower pressure drop was recorded for serpentine channel in comparison with meandering channel. Change in height of channel from 1 mm to 0.5 mm showed significant increase in water flux in case of serpentine channel. After comparison of experimental results with correlations, Philips (1988) for meandering channel and Geankoplis (1993) for serpentine channel was found to be most suitable for estimation of pressure drop. Comsol model for meandering channel gave results with reasonable accuracy whereas serpentine channel model has to be improved. Serpentine channel with 0.5 mm height exhibited best results with respect to both pressure drop and evaporation performance. This output is especially promising and opens new windows opportunity for this work.

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Contents
1 Introduction.................................................................................................. 3 1.1 1.2 Motivation ............................................................................................................... 3 Thesis...
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