Modeling of the Surface Deposition and Thermal Treatment of by Dietzel M.

By Dietzel M.

Expanding attempt of the medical neighborhood is dedicated to downsize technical devices concerning fluids to levels among sub-millimeter and nano-meter scales. this isn't in simple terms as a result of the curiosity in process miniaturization but additionally to novel operating ideas hidden within the dominance of surface-related actual phenomena that are negligible in greater, volume-controlled structures. Microfluidic platforms inherit, subsequent to their technical possibilities, basic clinical demanding situations in view that they contain either, phenomena which derive from continuum results and phenomena that are obtainable via a molecular view aspect in simple terms. This has yes implications om the modeling of those structures: types exclusively in accordance with the continuum procedure fail to foretell the approach habit, while types engaged on the molecular scale are hugely inefficient. Hybrid modeling techniques are accordingly required, frequently in kind of variations and extensions of the continuum process. during this context, the importance of thermocapillary convection caused in axisymmetric micro-flows of technical relevance is investigated herein. An in-house state of the art Finite point solver of the Navier-Stokes equations and effort equation in Lagrangian coordinates is prolonged to include a temperature-dependent floor rigidity and to thoroughly version the movement of the touch line (i.e. wetting). The already embedded solidification version is supplemented for evaporative part swap. The version is utilized to the deposition and solidification of micron-sized solder droplets utilized in the flip-chip undefined, to the thermocapillarity-induced rupture of capillary bridges in addition to to the quasi-isothermal printing and laser-induced heating of colloidal nanoparticle suspension beverages ('nanoinks'). The microfluidic version is prolonged within the latter case to trace the inertia-controlled movement of suspended debris subsequent to a monodispersed particle coagulation version. The numerical simulations are in comparison the place attainable with experiments. it's proven that Marangoni convection via an asymmetric evaporation at ambient stipulations is negligible, while all non-quasi-isothermal investigations convey a non-negligible effect of the thermocapillary strength. It provides in case of the solder drop deposition to the hassle in decreasing the footprint measurement via thermocapillarity-driven dewetting results. within the opposite, it explanations within the nanoink program an undesired displacement of the ink from the guts sector radially outwards, inflicting a attribute bowl form of the particle constitution shaped. The inertia-controlled particle version unearths particle structuring results in region of the substrate while the coagulation version indicates utilizing a laser mild absorption intensity within the order of the droplet top to make sure a uniformly agglomerated particle constitution. The latter is of specific significance for electrically engaging in buildings. The learn on particle coagulation in nanoinks is supplemented via a vapor bubble version round a unmarried nanoparticle heated by means of laser mild absorption. This version is meant to determine no matter if particle coagulation proceeds basically within the fuel or the liquid section. numerous technical and numerical concerns have been resolved subsequent to the clinical perception in the course of the improvement of this thesis. between these, the implementation of a public area meshing regimen within the fluid solver rather than the formerly applied advertisement meshing application is the main vast one. It improves the portability of this system with appreciate to assorted computational systems in addition to the neighborhood mesh answer and the computational time. the current examine demonstrates in an unique type the technical versatility of thermocapillary movement in microfluidic structures. It issues out new actual features, specifically within the interplay of Marangoni movement with wetting/de-wetting results. It highlights the main promising extensions of the continuum version to account for Gibbs loose strength pushed spreading on the touch line. furthermore, it describes the monitoring of discrete debris suspended in liquid domain names with arbitrarily relocating limitations. regardless of the technical relevance of particle suspension drinks with a unfastened floor, the current thesis is without doubt one of the first modeling makes an attempt of this type of difficulties. A monodispersed particle coagulation version on hand from the literature and basically derived for aerosols is changed to the current challenge and mixed in a distinct type with the unfastened floor microfluidic version, delivering a profound and effective software for destiny stories.

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A. Baer, R. A. Cairncross, P. R. Schunk, R. R. Rao and P. A. Sackinger, A finite element method for free surface flows of incompressible fluids in three dimensions. Part II. Dynamic wetting lines, International Journal for Numerical Methods in Fluids, 33, pp. 405-427, 2000 T. D. Blake and J. M. Haynes, Kinetics of Liquid/Liquid Displacement, Journal of Colloid and Interface Science, 30, pp. 421-423, 1969 T. D. Blake and J. De Coninck, The influence of solid-liquid interactions on dynamic wetting, Advances in Colloid and Interface Science, 96, pp.

Baer, R. A. Cairncross, P. R. Schunk, R. R. Rao and P. A. Sackinger, A finite element method for free surface flows of incompressible fluids in three dimensions. Part II. Dynamic wetting lines, International Journal for Numerical Methods in Fluids, 33, pp. 405-427, 2000 T. D. Blake and J. M. Haynes, Kinetics of Liquid/Liquid Displacement, Journal of Colloid and Interface Science, 30, pp. 421-423, 1969 T. D. Blake and J. De Coninck, The influence of solid-liquid interactions on dynamic wetting, Advances in Colloid and Interface Science, 96, pp.

G. an oil film in a pan). Local variations of the free surface temperature initiate by means of thermocapillarity convection cells, leading to the formation of local ridges and dimples on the surface, [13-15]. e. it occurs only if a system is not in a state of thermodynamic equilibrium 24 which initiates fluxes (heat and mass). To illustrate this, consider a capillary bridge treated in more depth in chapter 4. 48) which contradicts the equilibrium condition dG = 0 . Marangoni-Bénard cells serve evolutionary biologists as a simple analogy to self-organizing dissipative systems, [16, 17], implying that mammals operate far away from thermodynamic equilibrium.

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