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LATEST PROJECTS

Project | 01
Phase-change (liquid boiling) heat transfer of micro-nano structured surfaces ​
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  • Conducted phase-change cooling experiment

  • Performed the high speed imaging to capture bubble dynamics

  • Successfully improved the heat transfer performance copper surfaces by growing CuO nanostructure through chemical oxidation

  • Performed automated data acquisition and data analysis to characterize the heating performance

Project | 02
Development of counter-flow microfluidic devices for thermal stability in microfluidic reactors
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  • Designed, fabricated, and tested microfluidic thermal devices

  • Applied photolithography, silicon wet etching (KOH), wafer bonding, and inlet/outlet PDMS port attachment (Oxygen plasma bonding) for Glass/silicon devices

  • Applied rapid prototyping (xurography) for fabrication of Glass/Glass and Glass/Quartz microfluidic devices

  • Compared the thermal performance of direct-flow and counter-flow microfluidics at various flow rates 

  • Achieved impressive thermal ramp rate (150 K/s) using counter-flow design

  • Proposed the counter-flow as a way to overcome the thermal instabilities in microfluidics

Project | 03
Design analysis and structural-electrical FEA of a 3D printed liquid metal strain sensor

  • Obtained the Hyperelastic material model (Mooney-Rivilin) model of the 3D printed material (TPU) from uniaxial tensile test

  • Simulated the Structural and Electrical performance of the sensor in COMSOL and validated the models against experimental results

  • Conducted a parametric study on geometrical aspects (substrate thickness, liquid metal channel cross section, channel pattern, ...) and material aspects of the sensor to provide a guideline for the highest sensitivity in such sensors

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Project | 04
Automated Image processing of the high speed videos for extracting the bubble features
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  • Developed an algorithm for finding the average departing bubble diameters in MATLAB and obtained the average bubble diameters for different heat fluxes

  • Developed an algorithm for counting the bubbles in each frame in MATLAB and obtained the average bubble diameters for different heat fluxes

  • Applied preprocessing including Gaussian smoothing, FFT for removing the fin background fins, Morphological (tophat, bottomhat) to enhance the foreground bubbles and attenuate the background

  • Applied Edging (Prewitt), binarization (Otsu method), Morphological operations (closing, opening, filling) and used Circular Hough Transform for detecting the circular bubbles and finding the diameters

  • Removed the false positives using the glowing bright spot of the bubbles as a corrector

Project | 05
Parametric study for optimization of a continuous flow thermoelectric sensor
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  • A continuous-flow y-shaped microfluidic sensor was fabricated and modeled
    for optimum performance

  • Exothermic mixing of water and ethanol was modeled using a UDF in ANSYS Fluent to incorporate a nonuniform heat source detected by thermoelectric sensor

  • Simulation is validated for concentration and temperature against experimental data

  • Various ratio of water/ethanol and flow rates were simulated to find the optimum location

  • Guidelines are established for the sensor placement in these types of the devices

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