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 75 for “"nanofluids"”.
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Pool boiling heat transfer characteristics of nanofluids
Nanofluids are engineered colloidal suspensions of nanoparticles in water, and exhibit a very significant enhancement (up to 200%) of the boiling Critical Heat Flux (CHF) at modest nanoparticle concentrations (50.1% by volume). Since CHF is the upper limit of nucleate boiling, such enhancement …
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Synthesis and characterization of nanofluids for cooling applications
… the thermal conductivity of the resulting nanofluids. The aim of this project was to investigate the physico-chemical properties of nanofluids synthesized using submicron and high aspect ratio particles suspended in heat transfer fluids.
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Luminescent nanofluids based on perovskite materials and nanodiamonds
… This thesis aims to develop luminescent nanofluids based on halide perovskite QDs and nanodiamonds with optimized luminescent properties for biomedical applications. Nanofluids are colloidal suspensions of nanoparticles in a base fluid, which significantly enhance the thermal, optical, or …
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Negative magnetophoresis of submicron species in magnetic nanofluids
… shows that negative magnetophoresis in magnetic nanofluids can be used to size-selectively trap and focus submicron, nonmagnetic species.
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Static and Dynamic Thermal Behavior of Carbon Based Nanofluids
Nanofluids are a new class of heat transfer fluids which are engineered by dispersing nanometer-sized solid particles or tubes in conventional heat transfer fluids such as water, ethylene glycol, and engine oil.The first part of this study includes carbon nanotube (CNT)-ethylene glycol (EG) …
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Nanofluids and critical heat flux, an experimental and analytical study.
Nanofluids and critical heat flux, an experimental and analytical study.
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Determination of pool boiling Critical Heat Flux enhancement in nanofluids
Nanofluids are engineered colloids composed of nano-size particles dispersed in common fluids such as water or refrigerants. Using an electrically controlled wire heater, pool boiling Critical Heat Flux (CHF) of Alumina and Silica water-based nanofluids of concentration less than or equal to 0.1 …
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Tribological performance of jatropha oil-based nanofluids for orthogonal cutting process
The increasing awareness and concerns toward the environmental and health issues have risen the attention to shift the petroleum-based metalworking fluids (MWFs) toward the use of renewable and biodegradable energy sources for the production of MWFs. Thus, vegetable-based MWF, especially crude …
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Rheological characteristics of solvent free nanofluids: Thermal transitions and reactive curing
<p>Solvent-free nanofluids are a new and exciting class of material that evolved to address the limitations of their predecessors, nanocomposites. One of the most exciting aspects of solvent-free nanofluids is the wide range of tools chemists have to build and study them. Understanding how the …
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An experimental study of the flow boiling of refrigerant-based nanofluids
The use of nanofluids for various heat transfer applications has been a topic of intense research over the last decade. A number of studies to evaluate the thermophysical properties and single-phase heat transfer behavior of nanofluids have been reported. The current study is focused on the use of …
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Experimental and theoretical investigation of transport phenomena in nanoparticle colloids (nanofluids)
… transport behavior of nanoparticle colloids or nanofluids. The major efforts are: to determine methods to characterize a nanoparticle colloid's mass loading, chemical constituents, particle size, and pH; to determine temperature and loading dependent viscosity and thermal conductivity; to …
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Heat transfer enhancement in a rectangular duct by using winglet and nanofluids
… three dimensional turbulent flow of different nanofluids flow inside a rectangular duct with the existence of vortex generator winglets at different angle are (10º, 20º and 30º ) is numerically investigated. The effects of type of the nanoparticles, and Reynolds number on the heat transfer …
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Assessment of the Wear Effects of Alumina-Nanofluids on Heat-Exchanger Materials
<p>Nanofluids are nano-size-powder suspensions in liquids that are mainly studied for their abnormal thermal transport properties, and hence as enhanced alternatives to ordinary cooling fluids. The tribological effects of nanofluids are, however, largely unknown, in particular their likely wear …
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Nanofluids with optimised thermal properties based on metal chalcogenides with different morphology
… in a base fluid, typically named nanofluids. Nanofluids are considered as a new generation of heat transfer fluids since they exhibit thermophysical properties improvements compared with conventional heat transfer fluids. But there are still some barriers to overcome for the implementation of …
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Exploring the potential of nanofluids to enhance the productivity of solar stills
… very few numerical studies on solar stills with nanofluids are available. Moreover, based on a literature review, no study examining the effect of nanoparticle size on the productivity of solar stills, and on the economic and environmental performance of solar stills was found. Additionally, the …
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Design of an instrumented microchannel device for characterization of phase change nanofluids
… This work is the first step towards developing nanofluids and characterization tools to demonstrate the feasibility of such fluids for parabolic trough solar thermal power generation.
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Development of 2d metallic nanomaterials for nanofluids with application in concentrating solar power
… flowing through solar collectors. The use of nanofluids as has been proposed to improve this conversion. This thesis aims to provide knowledge and understanding of the Physical Chemistry of nanofluids, with particular attention to features and processes that determine their stability and heat …
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Critical evaluation of anomalous thermal conductivity and convective heat transfer enhancement in nanofluids
… has been made towards the practical use of nanofluids, uncertainties remain concerning the fundamental effects of nanoparticles on key thermo-physical properties. Nanofluids have higher thermal conductivity and single-phase heat transfer coefficients than their base fluids. The possibility …
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Critical heat flux enhancement via surface modification using colloidal dispersions of nanoparticles (Nanofluids)
Nanofluids are engineered colloidal dispersions of nanoparticles (1-100nm) in common fluids (water, refrigerants, or ethanol...). Materials used for nanoparticles include chemically stable metals (e.g., gold, silver, copper), metal oxides (e.g., alumina, zirconia, silica, titania) and carbon in …
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