Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 85 for “"contact line"”.
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Dynamics and Statics of Three-Phase Contact Line
… dynamic and static behaviors of the three-phase contact line. Therefore, a deep insight into the dynamics and statics of three-phase contact line at nanoscale is necessary for the technological advancement in nanotechnology and nanoscience. This dissertation aims to understand the dynamic wetting …
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Hybrid atomistic-continuum formulations and the moving contact line problem
… technique is subsequently applied to the moving contact line problem. The motion of contact lines (the locus of intersection of a two-fluid interface with a bounding solid) has, due to the multitude of length scales involved, been one of the few problems that has defied theoretical analysis over …
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Molten drop deposition and the dynamics of the molten contact line
… to this spreading process is the molten dynamic contact line problem, which involves the relationship between the speed of the contact line and the apparent (visible to the observer) contact angle of the molten liquid. This thesis examines the deposition of millimeter-scale molten drops on cold, …
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Influencing contact-line behavior in dynamic wetting through thermocapillarity and surface topography
… air to coat a moving substrate. A three-phase contact line is present wherever the solid surface, and the advancing and receding fluids intersect. Controlling the behavior of contact lines is key to improving the efficiency of industrial processes. The work in this thesis focuses on developing …
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Polyelectrolyte nanostructures formed in the moving contact line: fabrication, characterization and application
… surfaces by application of the moving contact line approach. It was demonstrated that the morphology of nanostructures displays a range of structure variations from root-like to a single wire structure with a high anisotropy and aspect ratio (providing diameters of several nanometers …
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FLOW FORMING OF CAPILLARY INTERFACES: DROP IMPACT AND THE MOBILE CONTACT LINE
… into fast-time scale motion of the three-phase contact-line (CL). The CL then comes to rest and the LG interface oscillates, viscously dissipating remaining energy on a slow-time scale. The energetics of drop deposition are characterized by high Reynolds number and moderate Weber number. …
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The influence of contact line dynamics on drop deposition, repellency, and condensation.
… equilibrium vapor is referred to as the "contact line," which play a crucial role in droplet's mobility on the surface. Various studies investigated the "contact line" problem and un- covered many unique physics that showed the relationship of wettability of the surface and liquid movement …
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Numerical investigation of the heat flux singularity at an advancing molten contact line
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.
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On the evaporation of sessile droplets
… in the two extreme modes, namely the constant contact radius mode, in which the contact line of the droplet is always pinned, and the constant contact angle mode, in which the contact line of the droplet is always de-pinned. In particular, we demonstrate how these two modes converge on strongly …
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On the rolling motion of viscous fluid on a rigid surface
… influence of insoluble surfactant at a moving contact line is considered. This work is mostly motivated by the air entrainment during the coating process where there is a three-phase contact point (e.g., air, liquid and solid). For moving contact line problems, when the fluid is assumed to be …
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Wetting hysteresis and droplet roll off behavior on superhydrophobic surfaces by Katherine Marie Smyth.
… difference between the advancing and receding contact angle and after many decades of research, the mechanisms governing hysteresis are still not fully understood. Particularly, stick-slip behavior of the three-phase contact line has been observed and qualitatively attributed to surface or …
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Precision rotational rheometry
… the effect, which is due to surface tension and contact line traction forces. The surface tension torque is reduced by maximizing rotational symmetry of the contact line, minimizing evaporation and the migration of the contact line, reducing the radial location of the contact line, and lowering …
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Micron-scale thermistors for rapid transients in interfacial temperature
… by the motion of the molten interface, or contact line, between the liquid droplet and the solid target. The solution for the heat transfer between the liquid and solid has an analytical singularity at the contact line. We therefore wish to closely examine the temperature history of the …
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Phase-Field Modeling of Oscillatory Wetting Phenomena with Contact Angle Hysteresis
… and Steen examines the connection between the contact line velocity and contact angle of liquid drops on an oscillating substrate that display contact angle hysteresis. Of particular interest in this experimental study is the analysis of the dependence of contact angle deviation on contact line …
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High-Resolution Experimental Measurements and Mechanistic Modelling of Saturated Cryogenic Pool Boiling Heat Transfer
… lead to pressurization of components like fuel line and tanks, cause two-phase flow instabilities during fuel transfer, or significantly reduce the usable amount of cryogenic fuel. Progresses in multiphase computational fluid dynamics (mCFD) can be leveraged to predict the two-phase flow …
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Displacement of Fluid Droplets From Solid Surfaces
… Bond number B d and advancing and receding contact angles thetaA and thetaR. To determine the yield conditions, we conduct a computational study employing a spectral implementation of the boundary integral method for Stokes flow. In these computations, we develop a novel Newton iteration …
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Fundamentals of microlayer evaporation and its role on boiling heat transfer enhancement
… </p> <p>Next, in-situ imaging of microlayer and contact line region is performed in a steady-state vapor bubble created by laser heating. The in-situ measurement of contact angle of vapor bubbles is conducted. For the laser power studied, the contact line readily forms in regular DI water which …
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Capillary forces and wetting dynamics by diffuse-interface modeling
… hydrates forming large clusters in subsea pipelines during crude oil transportation is a major concern. The dynamics of such systems is also of great interest from a fundamental perspective. Indeed describing non-equilibrium situations involving a 3-phase contact line is a long-standing problem …
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Transfer and Filling of Non-Newtonian Liquids in Printing and Coating Processes
… forces for flow to the resistance controlling contact-line motion. For Newtonian liquids, we find that the second regime is characterized by a power-law relationship similar to that observed for liquid-film withdrawal. We find that shear thinning improves cavity emptying compared to Newtonian …
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