A5073576283- Heat Transfer and Optimization
- Heat Transfer and Boiling Studies
- Mass Spectrometry Techniques and Applications
- Electrohydrodynamics and Fluid Dynamics
- Fluid Dynamics and Heat Transfer
- Ion-surface interactions and analysis
- Catalysts for Methane Reforming
- Microfluidic and Capillary Electrophoresis Applications
- Electron and X-Ray Spectroscopy Techniques
- Fluid Dynamics and Thin Films
- Radiative Heat Transfer Studies
- Thermal properties of materials
- Catalytic Processes in Materials Science
- Solar and Space Plasma Dynamics
- Refrigeration and Air Conditioning Technologies
- Diamond and Carbon-based Materials Research
- Force Microscopy Techniques and Applications
- Surface Modification and Superhydrophobicity
- Advanced Electron Microscopy Techniques and Applications
- Graphene research and applications
- Nanomaterials and Printing Technologies
- Ionosphere and magnetosphere dynamics
- 3D IC and TSV technologies
- Advanced Thermoelectric Materials and Devices
- Catalysis and Oxidation Reactions
Georgia Institute of Technology
2015-2024
Institut de Recherche en Astrophysique et Planétologie
2018-2024
U.S. National Science Foundation
2023
Centre National de la Recherche Scientifique
2018-2023
Université Toulouse III - Paul Sabatier
2018-2023
Lawrence Berkeley National Laboratory
2022
Geophysical Survey
2021
Institute for Scintillation Materials
2007-2020
AID Atlanta
2015-2019
Parker Hannifin (United States)
2019
The creation of a sustainable energy generation, storage, and distribution infrastructure represents global grand challenge that requires massive transnational investments in the research development technologies will provide amount needed on sufficient scale timeframe with minimal impact environment have limited economic societal disruption during implementation. In this opinion paper, we focus an important set solar, thermal, electrochemical conversion, conservation specifically related to...
Droplet departure frequency is investigated using environmental scanning electron microscopy with implications to enhancing the rate of dropwise condensation on superhydrophobic surfaces. Superhydrophobic surfaces, formed by cupric hydroxide nanostructures, allow condensate depart from a surface tilt angle 30° horizontal. The resulting decrease in drop size shifts distribution smaller radii, which may enhance heat transfer during condensation. enhancement estimated modifying Rose and Le...
Evaporation from thin films is a key feature of many processes, including energy conversion, microelectronics cooling, boiling, perspiration, and self-assembly operations. The phase change occurring in these systems governed by transport processes at the contact line where liquid, vapor, solid meet. Evidence suggests that altering surface chemistry topography on micro- nanoscales can be used to dramatically enhance vaporization. 2013 International Workshop Micro- Nanostructures for...
Boiling heat transfer from hybrid micro-nano structured thermal interfaces has been studied experimentally using PF5060 and deionized water as working fluids for the range of saturation temperatures Tsat between 35 °C 60 °C. Various enhancement structures were fabricated surface micromachining in silicon. The performance smooth roughened silicon surfaces, bare fully coated with carbon nanotubes (CNTs), silicon-etched well CNTs-based pin-fin arrays, 3D microstructures have detail. highest...
The drive for higher performance has led to greater integration and clock frequency of microprocessor chips. This translates into heat dissipation and, therefore, effective cooling electronic chips is becoming increasingly important their reliable performance. We systematically explore the limits removal from a model chip in various configurations. First, bare by pure conduction convection studied establish theoretical limit die bound an infinite medium. followed analysis packaged evaluating...
It is now widely recognized that the three-dimensional (3D) system integration a key enabling technology to achieve performance needs of future microprocessor integrated circuits (ICs). To provide modular thermal management in 3D-stacked ICs, interlayer microfluidic cooling scheme adopted and analyzed this study focusing on single layer performance. The effects mode (single-phase versus phase-change) stack/layer geometry are quantitatively analyzed, implications through-silicon-via scaling...
Superhydrophobic surfaces (SHSs) show promise as promoters of dropwise condensation. Droplets with diameters below ∼10 μm account for the majority heat transferred during condensation but their growth dynamics on SHS have not been systematically studied. Due to complex topography surface environmental scanning electron microscopy is preferred method observing droplets in this size regime. By studying beam heating effects condensed water we establish a magnification limit which are negligible...
A semianalytical, continuum analysis of evaporation water confined in a cylindrical nanopore is presented, wherein the combined effect electrostatic interaction and van der Waals forces taken into account. The equations governing fluid flow heat transfer between liquid vapor phases are partially integrated analytically, to yield set ordinary differential equations, which solved numerically determine characteristics on resulting shape rate from liquid-vapor interface. identifies three...
We report continuous monitoring of heterogeneously distributed oxygenated functionalities on the entire surface individual graphene oxide flake during chemical reduction process. The charge densities over with mixed oxidized and graphitic domains were observed for same after a step-by-step process using electrostatic force microscopy. Quantitative analysis revealed heavily nanoscale (50–100 nm across) complex mechanism involving leaching sharp asperities from followed by gradual thinning...
Visualization and scaling of drop-on-demand continuous-jet fluid atomization water are presented to elucidate the physics ejection process characterize modes operation a novel micromachined ultrasonic droplet generator. The device comprises reservoir that is formed between bulk ceramic piezoelectric transducer an array liquid horn structures wet etched into (100) silicon. At resonance, generates standing pressure wave within cavity focused at tip nozzle by structure. Device has been...
In recent years metal-assisted chemical etching (MaCE) of silicon, in which is confined to a small region surrounding metal catalyst templates, has emerged as promising low cost alternative commonly used three-dimensional (3D) fabrication techniques. We report new methodology for controllable folding 2D films into 3D structures using MaCE. This method takes advantage selective patterning the layer regions with mismatched characteristic dimensions, resulting uneven rates along notched...
Controlling coalescence events in a heterogeneous ensemble of condensing droplets on surface is an outstanding fundamental challenge and interfacial sciences, with broad practical importance applications ranging from thermal management high-performance electronic devices to moisture high-humidity environments. Nature-inspired superhydrophobic surfaces have been actively explored enhance heat mass transfer rates by achieving favorable dynamics during dropwise condensation; however, the...
The ionic liquid butylmethylimidazolium hexafluorophosphate (bmim)(PF6) and five different hydrofluorocarbon refrigerants were investigated as the working fluid pairs for a waste-heat driven absorption heat pump system possible applications in electronics thermal management. A significant amount of energy consumed large electronic systems is used cooling, resulting low grade waste heat, which can be to drive an refrigeration if suitable fluids identified. Redlich–Kwong-type equation state...
A new cooling scheme utilizing evaporation from an ultrathin, spatially confined liquid film is described and analyzed for thermal management of hot spots with local heat fluxes in excess 600 W/cm2. This achieved by a stable monolayer maintained on the surface using fully dry sweeping gas (e.g., air) blown at high velocity (50–100 m/s) above this monolayer. We also demonstrate how dielectric coolants like FC72 can outperform water as evaporative coolant scheme. work presents conceptual...
The ability to fabricate 3D spiraling structures using metal-assisted chemical etching (MaCE) is one of the unique advantages MaCE over traditional methods. However, control chirality has not been established. In this work, a systematic parametric study was undertaken for star-shaped catalysts, examining influence arm shape, length, number arms, center core diameter, and catalyst thickness on rotation direction. This data used identify set geometric parameters that reliably induce in...
Research Article| March 11, 2015 The European Arctic: A Laboratory for Seismoacoustic Studies Steven J. Gibbons; Gibbons aNORSAR, PO Box 53, 2027 Kjeller, Norwaysteven@norsar.no Search other works by this author on: GSW Google Scholar Vladimir Asming; Asming bKola Regional Seismological Center, Fersman street 14, Apatity 184200, Russia Lars Eliasson; Eliasson cSwedish Institute of Space Physics, 812, SE‐981 28 Kiruna, Sweden Andrei Fedorov; Fedorov Jan Fyen; Fyen Johan Kero; Kero Elena...