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 62 for “"Wenzel"”.
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A study of static and dynamic robustness of hydro/omniphobic surfaces
… Cassie-Baxter state to the fully-wetted Wenzel state and in the determination of the robustness of the composite state. As well as the static pressure difference due to the Laplace pressure, dynamic pressure difference due to various configurations including drop impact is also a source …
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Experimental Study of Wall Shear Stress Modification by Surface Coating: Pressure Drop Measurements in a Rectangular Channel
… is possible over hydrophobic surfaces in the Wenzel state during laminar and turbulent flows. Quantification of surface drag reduction in rectangular channel flow over walls with specific hydrophobic or hydrophilic properties was obtained with pressure drop measurements along the channel for a …
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A Mixed Methods Inquiry into the Decision-Making of California’s Principals During Local Control
… that are stable (Hanushek et al., 2013; Smylie & Wenzel, 2003; Cha, 2016; Sharpe, 1996), 2) clearly defined responsibilities (Wößmann, 2003; Cha, 2016), 3) principal leadership (Bryk et al., 1999), 4) distributive leadership and local decision-making (Smylie & Wenzel, 2003; Bryk et al., 1999; …
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Ink Transfer Mechanisms in Flexographic Printing
… angle data was used in conjunction with the Wenzel, Shuttleworth and Bailey, and Cassie and Baxter theories to understand the effect of the highly structured roughness produced by the engraving process, on the wettability of the anilox rolls. The findings of this work were that the laser type …
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Specialized Inter-Particle Interaction Lbm For Patterned Superhydrophobic Surfaces
… model to replicate some experimentally confirmed Wenzel and Cassie wetting cases. Regular roughness structures with different spacing were used to validate the study using the classical Wenzel and Cassie equations. This work highlights the strength and weakness of the SC model and attempts to …
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Capillarity in lithographically patterned micro channels
… the effects of surface topography assuming a Wenzel state. The theory has been tested via capillary rise experiments using polydimethylsiloxane oils of viscosity 96.0, 48.0, 19.2 and 4.8 mPa s within the 400μm and 600μm closed square glass tubes and SU8 open top smooth walled rectangular …
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Hierarchical superhydrophobic aluminum surfaces for condensation applications
… these surfaces were unable to achieve the proper Wenzel to Cassie-Baxter transition and produce a jumping behavior which is a necessary criterion for superhydrophobic condensation. However, the HCl etched aluminum surface was able to achieve heat transfer rates greater than the smooth, filmwise …
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INFLUENCE OF STRUCTURAL AND CHEMICAL ASYMMETRY OF NANOSTRUCTURES ON THE KINETICS OF WETTING
… rough, a form of wetting different from Wenzel and Cassie-Baxter states will arise. This form of wetting is commonly known as hemiwicking or 2D wicking, and involves a film of liquid wicking from the base of the droplet into the space between the nanostructures. The rate of imbibition of …
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Growth and characterisation of multifunctional nanocomposite coatings
… and anti-bacterial surfaces. A modified-Wenzel equation has been proposed to effectively correlate the surface wettability of the porous films with their surface roughness.
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Condensation heat transfer on nanoengineered surfaces
… This led to the eventual growth of a macroscale Wenzel droplet, which proved to be difficult to shed from the surface.
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Dynamical Phase-Change Phenomena
… physical behavior. Finally, the ``Cassie'' to ``Wenzel'' transition will be investigated for layered nano-textured surfaces. These phenomena will be modeled using thermodynamics and fluid mechanics equations.
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"We band of brothers"? A social-identity-based study of military public affairs professional identity, organizational socialization, and collaboration
… to achieve inclusion in the organization (Wenzel, Mummendey, & Waldzus, 2007). Findings further helped to broaden understanding of public relations collaboration by drawing attention to vital collaboration partners that have been obscured through their agglomeration in the concept of the …
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Tailoring hydrodynamics of non-wetting droplets with nano-engineered surfaces
… The careful investigation of Cassie-Baxter to Wenzel transition of a pendant drop during the deposition explains that the rapid deceleration-induced water hammer pressure causes the transition. This new transition mechanism for large droplets enables a new wetting transition phase diagram with …
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Geochemische Signale in spätpleistozänen Tiefseesedimenten aus dem nördlichen Benguela-Stromsystem: Indikatoren für paläoklimatische und paläoozeanographische Bedingungen
In dieser Arbeit werden die Ergebnisse von organisch-geochemischen Untersuchungen an spätpleistozänen Tiefseesedimentproben aus dem Walfisch-Becken vorgestellt. Das Probenmaterial mit einem maximalen Alter von 5,6 Millionen Jahren wurde während des Fahrtabschnitts 175 des internationalen …
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Entwicklung und Evaluation von fächerübergreifenden Bildungsangeboten im Schüler*innenlabor teutolab-biotechnologie
Die mathematisch-naturwissenschaftliche Grundbildung gilt als zentrale Grundvoraussetzung für die erfolgreiche gesellschaftliche und berufliche Teilhabe in der heutigen Gesellschaft. Allerdings ist ein negativer Trend in den Einstellungen Jugendlicher zu den MINT-Fächern zu verzeichnen. Zudem …
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Die Finanzierung von Eigentumswohnungen in Addis Abeba. Eine diskursanalytische Annäherung an Wohneigentum
Die Stadtregierung Addis Abebas begann im Jahr 2004 der zunehmend sichtbaren städtischen Wohnungskrise mit einem "Integrated Housing Development Program" (IHDP) entgegen zu wirken. Innerhalb dieses Großprojekts war bis zum Jahr 2011 der Bau von 225.000 Wohnungen vorgesehen, die ursprünglich zur …
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