A5083406851- Granular flow and fluidized beds
- Fluid Dynamics and Heat Transfer
- Cyclone Separators and Fluid Dynamics
- Fluid Dynamics and Thin Films
- Heat Transfer and Boiling Studies
- Heat Transfer and Optimization
- Nanomaterials and Printing Technologies
- Fluid Dynamics and Mixing
- Surface Modification and Superhydrophobicity
- Innovative Microfluidic and Catalytic Techniques Innovation
- Particle Dynamics in Fluid Flows
- Heat Transfer Mechanisms
- Geothermal Energy Systems and Applications
- Electrohydrodynamics and Fluid Dynamics
- Nanofluid Flow and Heat Transfer
- Iron and Steelmaking Processes
- Radiative Heat Transfer Studies
- Mineral Processing and Grinding
- Adhesion, Friction, and Surface Interactions
- Flow Measurement and Analysis
- Fluid Dynamics and Turbulent Flows
- Solar Thermal and Photovoltaic Systems
- Heat Transfer and Numerical Methods
- Reservoir Engineering and Simulation Methods
- Superconducting Materials and Applications
University of Edinburgh
2012-2024
Edinburgh College
2014
Spray cooling is used in of electronic devices to remove large heat fluxes. Heat transfer droplets impinging on a heated surface and boiling off has been studied. Most work well-controlled system single drop falling onto horizontal plate from fixed height. These have revealed the droplet impingement mechanics be function largely Weber number excess temperature, range regimes observed similar those pool boiling, with clearly identifiable critical flux. Nanofluids exhibit enhanced boiling. The...
The interactions between liquid droplets and solid surfaces during wetting phase change are important to many applications related the physicochemical properties of substrate fluid. In this work, we investigate experimentally evaporation pure water, ethanol, their binary mixture droplets, accessing a wide range surface tensions, on hydrophobic micro-pillared varying spacing pillars. Results show that structured surfaces, evaporate following three classical evaporative behaviors: constant...
Experiments using nanofluids in horizontal, rectangular, high-aspect-ratio microchannels were performed where heat was provided electrically to the microchannel wall bring about heating and phase change while recording temperature (via infrared camera) channel pressure drop. High-speed video captured images of boiling two-phase flow through transparent wall. Nanofluids used solutions aluminium oxide ethanol with particle concentrations from 0.01% 0.1%, pure as reference. Fluid mass flux...
The lifetime of a droplet deposited on hot plate decreases when the temperature increases, but above critical Leidenfrost temperature, suddenly increases. This is due to formation thin layer vapor between and substrate, which plays double role: First, it thermally insulates from plate, second, allows "levitate." point affected by roughness or microstructure surface. In this work, silicon surface with different microstructured regions square pillars was prepared such that there sharp...
A new void fraction estimation method for gas–liquid two-phase flow combining two differential pressure (DP) signals acquired from a single Venturi tube and based on Empirical Mode Decomposition (EMD) Artificial Neural Networks (ANN) was experimentally investigated. In order to study distribution in horizontal pipes, DP the top bottom sections of are EMD is adopted extract stable fluctuating components signals. Experimental data revealed that index increases nearly linearly with increasing...
A study was undertaken of ethanol droplet evaporation on structured surfaces pillars (square variable dimensions and spacing order microns, cylindrical various spacings). On seasoned perflourodecyltrichlorosilane surfaces, significant films were observed extending far beyond the initial contact line for pure droplets, most prominently 4 microlitre droplets. parylene coated similar imbibed seen 1.5 droplets 50% by volume ethanol-water mixture. This film acts as an additional surface it...
Evaporation in restricted domains, e.g. capillaries, is of industrial importance but poorly understood. Where the evaporating liquid a binary mixture, preferential evaporation more volatile component occurs initially and rate not constant, indeed it appears to occur stages. Experiments from entrance capillary were performed for various mixtures acetone water pure liquids comparison. Measurements mass taken over time range diameters 0.6 mm 2 mm. For simplicity, experiments with meniscus...
Contact angle dynamics of droplets deposited on a structured surface were studied in this work and the effects substrate microstructure temperature investigated. Microstructures consisting uniformly-sized, cubic micropillars with varying pillar spacings constructed by microfabrication. Droplets (of order tens microlitres volume) these surfaces dynamic contact angles observed using various techniques. Advancing receding measured tilting or injection aspiration fluid from horizontal droplet...
The aim of the present experimental study is to investigate flow boiling characteristics in a high aspect ratio microchannel for two different channel orientations. Hydrofluoroether 7000 (HFE−7000) flowing within rectangular glass (with hydraulic diameter 909 μm and width-to-height 10) coated with tantalum layer provide uniform heating along was configuration investigated. data were recorded mass fluxes 14 − 42 kg m−2 s−1, while heat flux varied between 3.5 24.3 kW/m−2(-|-) under horizontal...