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Showing 1 to 20 of 71 for “"Nanofluid"”.
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Nanofluid Heat Transfer Enhancement in Engineering Applications
Made available in DSpace on 2017-07-06T18:56:09Z (GMT). No. of bitstreams: 3 Saripella_Surya_K_MS.pdf: 2415505 bytes, checksum: 09478787920f495e59c6d82daba0b4da (MD5) Saripella_Surya_K_MS_ABS.pdf: 72780 bytes, checksum: ab288f55074e3a6e9cba8a8feb760098 (MD5) license.txt: 4813 bytes, checksum: …
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Asymptotic analysis of mass-dominated convection in a nanofluid
The threshold conditions for the onset of convection in colloidal suspensions is investigated using the particulate medium formulation. We consider a dilute liquid suspension of solid spherical particles that is confined between two horizontal plates of infinite extent placed at the vertical …
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Experimental evaluation of heat transfer characteristics of silica nanofluid
… characteristics were investigated for silica nanofluid. An experimental loop was built to obtain heat transfer coefficients for single-phase nanofluids in a circular conduit in laminar flow regime. Thermal conductivity and viscosity measurements were conducted on the silica nanofluid to …
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Physical properties, evaporation and combustion characteristics of nanofluid-type fuels
<p>Nanofluids are liquids with stable suspension of nanoparticles. Limited studies in the past have shown that both energetic and catalytic nanoparticles once mixed with traditional liquid fuels can be advantageous in combustion applications, e.g., increased energy density and shortened ignition …
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Stabilization of Magnetite Nanofluid and its Transport in Porous Media
… the containment of CO2 underground. A stable nanofluid dispersion must be attained to facilitate long distance transport of nanoparticles in porous media. Achieving a stabilized nanofluid is a major challenge since nanoparticles have a tendency to aggregate due to their high surface energy. …
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Coupling of nanofluid flow, heat transfer and nanoparticles sedimentation using OpenFOAM
Nanofluid is a suspension containing a certain quantity of nanoscaled solid particles in a conventional cooling liquid. Compared to pure liquid in micro channels, nanofluid shows notably better heat transfer performance but without erosion and clogging problems as normal two-phase suspensions. Due …
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The impact of thermophysical properties on nanofluid-based solar collector performance
Nanofluids are a novel class of heat transfer fluids in which nanoparticles are dispersed in traditional heat transfer fluids. They offer enhanced thermophysical, rheological and radiative properties. These enhancements have resulted in recent research being centred on the application of nanofluids …
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Nanofluid-based receivers for high-temperature, high-flux direct solar collectors
… reduces the concentrated heat at the surface. Nanofluid-based direct solar receivers, where nanoparticles in a liquid medium can scatter and absorb solar radiation, have recently received interest to efficiently distribute and store the thermal energy. In this thesis, a combined modeling and …
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MHD stagnation flow of nanofluid past a permeable shrinking surface with various conditions
The purpose of the present study is to analyze the effects of slip and heat source/sink on magnetohydrodynamic stagnation-point flow and heat transfer past a permeable shrinking surface with convective boundary condition. The velocity and temperature profiles are analyzed with respect to the …
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Heat transfer enhancement in horizontal double tube concentric/eccentric heat exchanger by using nanofluid
… en flujo convectivo forzado en transición para nanofluidos en base agua con Al2O3, Cu, y Cu-Al2O3, con concentraciones de 0 a 3 %. Después, se generó un modelo 3D para investigar el efecto de rotar el tubo interior del intercambiador de calor de
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Numerical simulation of heat transfers on a circular cylinder by an impinging jet with nanofluid
… circular cylinder are bombarded with water and "nanofluid" as a fluid jet. Increase the heat transfer rate by using three types of "nanofluids"namely,(water+Al2O3), (water+ CuO) and (water + SiO2) as a fluid jet impingement also studied.. Effects of different Reynolds numbers (Red) in based …
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Evaluation Of Thermophysical Properties, Friction Factor And Heat Transfer Of Alumina Nanofluid Flow In Tubes
… heat transfer characteristics were measured for nanofluid with 6% volume concentration of solid Al2O3 nanoparticles in water. Thermal conductivity measurements showed that there is a definite enhancement in thermal conductivity of the nanofluid compared to that of water. At 7°C, the enhancement …
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Stagnation-point flow past a vertical stretching or shrinking sheets in a nanofluid with slip effect
This dissertation investigates the boundary layer stagnation-point over a shrinking or stretching sheet in the presence of velocity slip and thermal slip. Governing non-linear PDEs are transformed into corresponding non-linear coupled ODEs along with boundary conditions using similarity …
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Thermal radiation and slip effects on mhd stagnation point flow of nanofluid over a shrinking sheet
This study is conducted to analyze the effects of thermal radiation and slip effects on magnetohydrodynamic stagnation point flow over a shrinking sheet. The velocity, temperature, and nanoparticles concentration profiles are analyzed with respect to the involved parameters such as Lewis number, …
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Measurement of near-surface void fraction and macrolayer thickness in boiling water and silica-based nanofluid
Nanofluids are engineered fluids that contain a suspension of nanoparticles in a pure substance. Nanoparticles can be any variety of metals, metal oxides, or ceramics. They have been shown to increase heat transfer properties such as thermal conductivity, convective heat transfer, and critical heat …
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Investigation of the use of nanofluids to enhance the In-Vessel Retention capabilities of Advanced Light Water Reactors
Nanofluids at very low concentrations experimentally exhibit a substantial increase in Critical Heat Flux (CHF) compared to water. The use of a nanofluid in the In-Vessel Retention (IVR) severe accident management strategy, employed in Advanced Light Water Reactors, was investigated. A model …
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Numerical study of nanofluid-based direct absorber solar collector systems with metallic/carbon nanoparticles, multiple geometries and multi-mode heat transfer
Nanofluids are complex colloidal suspensions comprising nanoparticles (metallic or carbon based or both) suspended in a base fluid (e.g. water). The resulting suspension provides demonstrably greater thermal performance than base fluids on their own without the agglomeration or sedimentation …
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Experimental investigation of effects of surface roughness, wettability and boiling-time on steady state and transient CHF for nanofluids
… shown that a suspension of nanoparticles called nanofluids in DI water enhances the CHF of water significantly. During boiling, nanoparticles in the nanofluid develop a coating on the heater surface, which is porous and hydrophylic, leading to a higher CH{F compared to water. One of the primary …
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Computational analysis of magnetohydrodynamics boundary layer flow of nanofluid over a stretching sheet in the presence of heat generation or absorption and chemical reaction
… of two-dimensional magnetohydrodynamics of a nanofluid over a stretching sheet in the presence of chemical reaction, as well as heat generation or absorption. The partial differential equations are reduced to coupled nonlinear ordinary differential equations using similarity transformations, …
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Study of chemistry and irradiation effects on nanofluids to be used in light water reactor accident cooling
Nanofluids, colloidal dispersions of nanoparticles in a base fluid, have shown enhancements in both pool boiling and flow boiling critical heat flux (CHF) in laboratory tests. The applicability of this aspect to nuclear reactor post-accident cooling is promising. This study investigates various …
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