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Table of contents
Introduction
1 Synthesis and Objectives of the thesis
2 Organization of the Thesis
3 Publications
3.1 Journals
3.2 Conferences
3.3 Talks
Chapter 1 Hydrodynamic-based techniques for improving transfer efficiency in membrane separation processes and heat exchangers
1.1 Filtration techniques and membrane separation
1.1.1 Tangential liquid filtration
1.1.2 Membrane separation processes
1.1.3 Main geometries used
1.2 Heat exchanger processes
1.3 Concentration/ Temperature polarization
1.4 Hydrodynamic solutions to limit concentration/temperature polarization
1.4.1 Tangential flow
1.4.2 Turbulence promoters
1.4.3 Rough walls
1.4.4 Pulsate flow
1.4.5 Vibrating system in membrane separation
1.4.6 Ultrasound
1.4.7 Rotary systems
1.4.8 Gas sparging
1.4.9 Complex shapes
Chapter 2 Laminar flow friction factor in highly curved helical pipes: numerical investigation, predictive correlation and experimental validation using a 3D-printed model
2.1 Introduction
2.2 Materials and methods
2.2.1 Friction factor and dimensional analysis
2.2.2 CFD modeling and simulation
2.2.3 3D-printed helical pipe
2.2.4 Experimental setup for pressure drop measurements
2.3 Results and discussion
2.3.1 CFD results
2.3.2 Correlation development
2.3.3 Comparison with literature correlations
2.3.4 Correlation validation using experimental data from literature
2.3.5 Correlation validation using data acquired on the 3D-printed highly curved helix
2.4 Conclusion
Chapter 3 Optimal design of helical heat/mass exchangers under laminar flow: CFD investigation and correlations for maximal transfer efficiency and process intensification performances
3.1 Introduction
3.2 CFD computation of Nusselt (and Sherwood) number in helical pipe flows
3.2.1 Nusselt (and Sherwood) number in helical pipe flows
3.2.2 CFD modeling and simulation of heat transfer in helical pipes under laminar flow conditions
3.2.3 Heat and mass transfer analogy
3.3 Optimal packing density of helixes
3.4 Results and discussion
3.4.1 CFD results
3.4.2 Correlation for predicting Nusselt (and Sherwood) numbers in helical pipe laminar flows
3.4.3 Comparison between the current and literature correlations
3.4.4 Correlation and CFD data validation using experimental data from literature
3.4.5 Optimal packing density of helixes: results and correlation
3.4.6 Overall intensification factor and potentiality of highly curved helical pipes designs
3.5 Conclusion
Chapter 4 Transport phenomena in helical heat and mass exchangers under high Prandtl/Schmidt number conditions
4.1 Introduction
4.2 CFD computation of Nusselt (and Sherwood) number in helical pipe flows
4.2.1 Mesh-independence study
4.2.2 CFD modeling and governing equations
4.2.3 Thermally developing and hydrodynamically developed flow
4.3 Results and discussion
4.3.1 CFD Results
4.3.2 Non-periodic flow
4.3.3 Overall intensification factor and potentiality of highly curved helical pipes
4.4 Conclusion
Chapter 5 Heat / Mass transfer intensification using helically coiled pipes: potentiality and comparison to alternative enhancement techniques
5.1 Introduction
5.2 Transport phenomena in helical pipe flow
5.2.1 Helical pipes design, packing density and specific surface area
5.2.2 Hydrodynamics and heat/mass transfer in helical pipe flows
5.3 Alternative heat/mass transfer enhancement techniques
5.4 Results and discussion
5.4.1 Heat/Mass transfer enhancement per unit surface
5.4.2 Volumetric heat/mass transfer enhancement
5.4.3 Cost-effectiveness of heat/mass transfer enhancement per unit surface
5.4.4 Cost-effectiveness of volumetric heat/mass transfer enhancement
5.4.5 Cost-effectiveness of volumetric heat/mass transfer enhancement in ‘shell-andtube’ configurations
5.5 Conclusion
Chapter 6 Toward novel coiled heat/mass exchangers designs
6.1 Introduction of the Complex helical shapes
6.1.1 Wavy helical pipes
6.1.2 Double helical pipes
6.2 Conclusion
