A5011674423- Nuclear reactor physics and engineering
- Nuclear Materials and Properties
- Heat Transfer and Boiling Studies
- Nanofluid Flow and Heat Transfer
- Nuclear Engineering Thermal-Hydraulics
- Heat Transfer and Optimization
- Graphite, nuclear technology, radiation studies
- Nuclear and radioactivity studies
- Heat Transfer Mechanisms
- Heat transfer and supercritical fluids
- Fusion materials and technologies
- Nuclear Physics and Applications
- Fluid Dynamics and Turbulent Flows
- Radiation Detection and Scintillator Technologies
- Fluid Dynamics and Thin Films
- Solar Thermal and Photovoltaic Systems
- Field-Flow Fractionation Techniques
- Advanced Thermodynamics and Statistical Mechanics
- Fluid Dynamics and Mixing
- Spacecraft and Cryogenic Technologies
- Fluid Dynamics and Heat Transfer
- Particle Dynamics in Fluid Flows
- Advanced Multi-Objective Optimization Algorithms
- Refrigeration and Air Conditioning Technologies
- Fault Detection and Control Systems
Massachusetts Institute of Technology
2014-2024
Nanjing University of Posts and Telecommunications
2014
Argonne National Laboratory
2013
Kyung Hee University
2011
National Tsing Hua University
1994-1995
The turbulent convective heat transfer behavior of alumina (Al2O3) and zirconia (ZrO2) nanoparticle dispersions in water is investigated experimentally a flow loop with horizontal tube test section at various rates (9000<Re<63,000), temperatures (21–76°C), fluxes (up to ∼190kW∕m2), particle concentrations (0.9–3.6vol% 0.2–0.9vol% for Al2O3 ZrO2, respectively). experimental data are compared predictions made using the traditional single-phase viscous pressure loss correlations fully...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Harry O'Hanley, Carolyn Coyle, Jacopo Buongiorno, Tom McKrell, Lin-Wen Hu, Michael Rubner, Robert Cohen; Separate effects of surface roughness, wettability, porosity on the boiling critical heat flux. Appl. Phys. Lett. 8 July 2013; 103 (2): 024102. https://doi.org/10.1063/1.4813450 Download citation file: Ris...
Nanofluids are engineered colloidal suspensions of nanoparticles in water and exhibit a very significant enhancement (up to 200%) the boiling critical heat flux (CHF) at modest nanoparticle concentrations ($0.1% by volume). Since CHF is upper limit nucleate boiling, such offers potential for major performance improvement many practical applications that use as their prevalent transfer mode. The Massachusetts Institute Technology exploring nuclear nanofluids, specifically following three: 1....
In recent quenching heat transfer studies of nanofluids, it was found that deposition nanoparticles on a surface raises its Leidenfrost point (LFP) considerably [Kim et al., Int. J. Multiphase Flow 35, 427 (2009) and Kim Heat Mass Transfer 53, 1542 (2010)]. To probe the physical mechanism underlying this observation, effects properties LFP water droplets were studied, using custom-fabricated surfaces for which roughness height, wettability, porosity controlled at nanoscale. This approach...
Nanofluids are being considered for heat transfer applications; therefore it is important to know their thermophysical properties accurately. In this paper we focused on nanofluid specific capacity. Currently, there exist two models predict a capacity as function of nanoparticle concentration and material. Model I straight volume-weighted average; II based the assumption thermal equilibrium between particles surrounding fluid. These give significantly different predictions given system....
Transient hot-wire data on thermal conductivity of suspensions silica and perfluorinated particles show agreement with the mean-field theory Maxwell but not recently postulated microconvection mechanism. The influence interfacial resistance, convective effects at microscales, possibility enhancements beyond limit are discussed.
Infrared thermometry was used to obtain first-of-a-kind, time- and space-resolved data for pool boiling phenomena in water-based nanofluids with diamond silica nanoparticles at low concentration (<0.1 vol.%). In addition macroscopic parameters like the average heat transfer coefficient critical flux [CHF] value, more fundamental such as bubble departure diameter frequency, growth wait times, nucleation site density [NSD] were directly measured a thin, resistively heated, indium-tin-oxide...
This paper reports the testing results of radiation resistant fiber Bragg grating (FBG) in random air-line (RAL) fibers comparison with FBGs other radiation-hardened fibers.FBGs RAL were fabricated by 80 fs ultrafast laser pulse using a phase mask approach.The gratings tests carried out core region 6 MW MIT research reactor (MITR) at steady temperature above 600°C and an average fast neutron (>1 MeV) flux >1.2 × 10 14 n/cm 2 /s.Fifty five-day FBG sensors showed less than 5 dB reduction peak...
Layering of water molecules on the surface alumina nanoparticles in an alumina/water nanofluid is studied using nuclear magnetic resonance (NMR). The data suggest that a thin ordered layer (∼1.4 nm) surrounds each nanoparticle. This increases nanoparticle effective volumetric fraction; however, thermal conductivity appears to be unaffected by this layer, and good agreement with Maxwell’s medium theory. Furthermore, NMR do not enhance, but rather stifle micromixing base fluid.
Many studies have shown that addition of nanosized particles to water enhances the critical heat flux (CHF) in pool boiling. The resulting colloidal dispersions are known literature as nanofluids. However, for most potential applications nanofluids situation interest is flow This technical note presents first-of-a-kind data boiling CHF It a significant enhancement (up ∼30%) can be achieved with little 0.01% by volume concentration alumina nanoparticles experiments at atmospheric pressure,...
Colloidal dispersions of nanoparticles are known as ‘nanofluids’. Such engineered fluids offer the potential for enhancing heat transfer, particularly boiling while avoiding drawbacks (i.e., erosion, settling, clogging) that hindered use particle-laden in past. At MIT we have been studying transfer characteristics nanofluids past five years, with goal evaluating their benefits and applicability to nuclear power systems primary coolant, safety systems, severe accident mitigation strategies)....
Nanofluids are being studied for their potential to enhance heat transfer, which could have a significant impact on energy generation and storage systems. However, only limited experimental data metal metal-oxide based nanofluids, showing enhancement of the thermal conductivity, currently available. Moreover, majority available been obtained using transient methods. Some controversy exists as validity measured possibility that this may be an artifact methodology. In current investigation,...
The Critical Heat Flux (CHF) of water with dispersed alumina nanoparticles was measured for the geometry and flow conditions relevant to In-Vessel Retention (IVR) situation which can occur during core melting sequences in certain advanced Light Water Reactors (LWRs). CHF measurements were conducted a boiling loop featuring test section designed be thermal-hydraulically similar vessel/insulation gap Westinghouse AP1000 plant. effects orientation angle, pressure, mass flux, fluid type, time,...