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 24 for “"Drop Impact"”.
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Fundamentals in unsteady fluid fragmentation from drop impact
… processes is unsteady, continuously generating droplets of properties that vary over time. Yet, the dynamics of unsteady fragmentation has received little attention thus far. Common examples of unsteady fragmentation are splashes created upon drop impact on either a liquid pool or a solid …
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Drop Impact Reliability Testing Lead-Free Chip Scale Packages
… digital assistants (PDAs) are prone to be dropped in their lifetime. The drop event may result in failure of solder joints inside these devices. The importance and widespread use of these devices in both business and leisure activities continues to increase, so device failure is …
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FLOW FORMING OF CAPILLARY INTERFACES: DROP IMPACT AND THE MOBILE CONTACT LINE
Drop depositions are impacts where post impact the drop remains on the surface and its liquid/gas (LG) interface does not break apart. Our focus is on drop depositions in the capillary-ballistic regime. During drop impact, the falling drop’s pre-impact energy transforms into fast-time scale motion …
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Fluid characterisation and drop impact in inkjet printing for organic semiconductor devices
… fluids and identify the key parameters affecting drop impact and spreading processes. Various fluid characterisation techniques such as the filament stretching rheometer and piezoelectric axial vibrator are explored. We propose an experimental method to assess the jettability of non-Newtonian …
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Meaningful descriptions of thixotropy and extensibility for yield-stress fluid drop impact on thin films
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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Experimental and theoretical study about drop impact on inclined surfaces and substrates with different roughness and wettability
… se abordan tres aspectos relacionados con el impacto de gotas sobre superficies lisas y rugosas, tanto hidrofílicas como hidrófobas. El estudio del impacto de gotas sobre sustratos sólidos puede clasificarse en: i) el análisis de la expansión, conocida como spreading, y posterior retracción …
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Asymmetric Behavior of a Drop Upon Impact onto a Surface
… a systematic study was performed to understand drop impact onto hydrophilic and hydrophobic moving surfaces. Different systems (combination of liquids, surfaces, and drop impact conditions) were examined. Wide range of normal drop and surface velocities were studied; such normal and tangential …
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Drop deformation dynamics in extensional flows : influence of chemical-, mechanical- and photo-degradation.
Polymer drop impact on a solid substrate is commonplace in many industrial applications, such as inkjet printing, agricultural pesticides, and spray coating, where dyes and surfactants are used to enhance various functionalities. Pesticide spray droplets can sometimes deviate from their intended …
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A study of static and dynamic robustness of hydro/omniphobic surfaces
Liquid droplets in the Cassie-Baxter state form liquid-air interfaces that are not flat but distorted due to pressure differences across the interfaces between the asperities. These distorted interfaces play an essential role in the transition from the composite Cassie-Baxter state to the …
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An experimental study of evaporative cooling from liquid droplets impinging on a hot surface
… characterize the different regimes observed in drop impacts during evaporative cooling of heated surfaces. We found four regimes which were named splashing, fizzing, flat film, and marbling based on the dynamic properties of the drop impact. We found that the emergence of these regimes is …
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Development of particle-scale simulation methods for multiphase flow study
… of biomass particles and interactions of fuel drops and heated walls.</p> <p>The first topic is the fast pyrolysis of biomass materials, an effective means to convert biomass into useful energy products. The conversion process can be significantly affected by the properties of the biomass …
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Impact cratering with yield-stress fluids
Impact cratering is the process where a moving object hits a deformable target, causing material to be ejected away from the impact point, at least most of the times, and opening a crater on the target surface. This process has been studied extensively to understand the dynamics of planetary impact …
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Investigation of Steel Joist Supported Wood Floor Systems
… tests were performed for each floor setup: heel drop impact, walking perpendicular and parallel to the floor joists, static concentrated load at midspan, and testing to determine subjective evaluation. Five acceptability criteria were investigated: Swedish Building Technology Design Guide, …
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Droplet deposition on hydrophobic surfaces for agricultural sprays
… in-situ precipitation of polyelectrolytes during droplet impacts and its applications in enhancing the retention efficiency of sprays. Large amounts of agricultural sprays are wasted worldwide, due to the poor retention on hydrophobic plants. As the harmful effects of pesticides in particular are …
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Traumatic Injury-Induced Cell Responses in Human Cortical Organoids
Traumatic brain injury (TBI) impacts millions of individuals worldwide each year, which often leads to permanent disabilities and emerges as an important risk factor for neurodegenerative diseases. This is driven by secondary injury cascades of cellular toxicity, inflammation, and aggregation of …
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Investigation of several aspects of the vibration characteristics of steel member-supported floors
… of tee-beams effective in resisting a heel-drop impact for steel joist and steel beam-concrete slab floors, 2) the effective moment of inertia of steel joist and joist-girder members, 3) the ability of joist seats to provide composite behavior between the supporting member and overlying …
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Physico-chemical hydrodynamics of droplets on textured surfaces with engineered micro/nanostructures
Understanding physico-chemical hydrodynamics of droplets on textured surfaces is of fundamental and practical significance for designing a diverse range of engineered surfaces such as low-reflective, self-cleaning or anti-fogging glass, easy-cleaning robust inkjet printer heads, or efficient …
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Multiphase Interfacial Phenomena for Liquid Manipulation and Defrosting
… as phase transitions and interaction of liquid droplets with different surfaces. The insights gained from understanding interfacial behavior are pivotal in fields such as pharmaceuticals, microfluidics, material sciences, and environmental engineering. This dissertation aims to advance our …
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Compatibilisation of heterogeneous polymer blends by reactive processing
… in tensile strength, albeit increased in drop impact strength particularly in blend containing high PS content (80%). The SPD2 was particularly effective in enhancing impact strength in blends containing low weight ratio of PP (<70%). The SPD2 was also a good thermal antioxidant albeit …
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Impact and Departure Dynamics of Droplets and Bubbles
Droplets and bubbles are important for understanding natural phenomena such as falling raindrops, airborne disease transmission, and plant respiration systems, and also for engineering contexts such as semiconductor fabrication, nuclear power plants, and electronics cooling. However, still, more …
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