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 11 of 11 for “"Departure frequency"”.
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Experimental Investigation of Subcooled Flow Boiling and CHF at Prototypical Pressures of Light Water Reactors
… resolutions. We explored aspects of bubble departure, microlayer and triple contact line evaporation, boiling parameters (i.e. nucleation site density, bubble departure frequency, wait and growth times), heat flux partitioning and departure from nucleate boiling. The results reveal that in …
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Wettability of candidate Accident Tolerant Fuel (ATF) cladding materials in LWR conditions
… determines nucleation site density, bubble departure diameter, and bubble departure frequency.
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Experimental analysis of boiling enhancement from surfactant addition with electric fields
… to higher nucleation density and higher bubble departure frequency. The critical heat flux, on the other hand, generally dropped by nearly 50% in the presence of surfactants. As these surfactants are charged molecules, the application of an electric field was used to increase or decrease …
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Synthesis of CRUD and its effects on pool and subcooled flow boiling
… heat flux (CHF), nucleation site density, bubble departure frequency, and bubble departure diameter. These heaters were tested in pool and flow boiling facilities in MIT's Reactor Hydraulics Laboratory. Synthetic CRUD was created using layer-by-layer deposition of 100 nm silica nanoparticles to …
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Investigation of the pool boiling heat transfer enhancement of nano-engineered fluids by means of high-speed infrared thermography
… nanoparticles to the working fluid. Bubble departure diameter and frequency, growth and wait times, and nucleation site density were measured for every nucleation site during nucleate pool boiling at multiple superheats. The data were compared with decades-old and poorly-validated models and …
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Thermal bubble behaviour in liquid nitrogen under electric fields
… such as bubble growth, deformation and bubble departure frequency have been experimentally evaluated. Finally, the electric field effects on boiling heat transfer of LN2 have been experimentally assessed. The obtained data is applicable to the design of LN2 cooled high temperature …
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Numerical study of vertical subcooled boiling flow with new wall nucleation models
… since wall nucleation parameters, such as bubble departure diameter and bubble departure frequency, partially constitute the boundary conditions of gas phase. However, in previous work, sensitivity study of wall nucleation models and validation of predicted wall nucleation parameters were not …
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Autonomous Experimentation to Accelerate Boiling Heat Transfer Research
… site density, bubble growth time, wait time, departure diameter, dry area fraction and distribution, and contact line density. To this end, a machine learning (ML) methodology was developed to accelerate the analysis of infrared data obtained during boiling heat transfer investigations. Deep …
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Experimental investigation of variability between nucleation sites in flow boiling
This Thesis was approved for publication on 2017-12-04 at 12:43.
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Enhancement Techniques of Boiling Heat Transfer
… and collapse quickly. Also, the bubble departure frequency is higher than that of pure water. Compared with water, it is found that time required to reach boiling point for surfactant concentrations is reduced significantly. The maximum reduction for each surfactant was 14.6% for 100ppm …
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Fundamentals of microlayer evaporation and its role on boiling heat transfer enhancement
… bubble ebullition cycle (nucleation, growth and departure) happens over a very short time-span (milliseconds) making it challenging to study the near-surface interfacial characteristics of a single bubble, which involves a microlayer. The microlayer is a thin film present at the bubble base and …