LATEST PROJECTS
Project | 01
Phase-change (liquid boiling) heat transfer of micro-nano structured surfaces
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Conducted phase-change cooling experiment
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Performed the high speed imaging to capture bubble dynamics
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Successfully improved the heat transfer performance copper surfaces by growing CuO nanostructure through chemical oxidation
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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
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Applied photolithography, silicon wet etching (KOH), wafer bonding, and inlet/outlet PDMS port attachment (Oxygen plasma bonding) for Glass/silicon devices
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Applied rapid prototyping (xurography) for fabrication of Glass/Glass and Glass/Quartz microfluidic devices
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Compared the thermal performance of direct-flow and counter-flow microfluidics at various flow rates
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Achieved impressive thermal ramp rate (150 K/s) using counter-flow design
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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
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Obtained the Hyperelastic material model (Mooney-Rivilin) model of the 3D printed material (TPU) from uniaxial tensile test
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Simulated the Structural and Electrical performance of the sensor in COMSOL and validated the models against experimental results
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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
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
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Developed an algorithm for counting the bubbles in each frame in MATLAB and obtained the average bubble diameters for different heat fluxes
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Applied preprocessing including Gaussian smoothing, FFT for removing the fin background fins, Morphological (tophat, bottomhat) to enhance the foreground bubbles and attenuate the background
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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
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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
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Simulation is validated for concentration and temperature against experimental data
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Various ratio of water/ethanol and flow rates were simulated to find the optimum location
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Guidelines are established for the sensor placement in these types of the devices
