Research
Natural and Mixed Convection (Current Research)
Optical Measurment Methods: 2D PIV, 3D Scanning PIV, PLIF, 3D Scanning LIF, IR Imaging
Rayleigh-Bénard Convection
Rayleigh-Bénard convection (RBC) is a phenomenon that occurs when a fluid layer is heated from below and cooled from above. This creates a temperature gradient within the fluid, leading to the development of convection cells. These cells are characterized by the upward movement of warmer fluid at the center and the downward flow of cooler fluid at the edges. The phenomenon is relevant in various natural and industrial processes, such as the Earth's mantle dynamics, the atmosphere, and even the cooling of electronic devices. 2D and 3D optical diagnostics were employed to measure and visualize the velocity and temperature fields of RBC. The main purpose of this work was to investigate the role of large-scale circulating structures and convection cell geometry characteristics on the critical characteristics of the RBC such as heat and momentum transfer.
Poiseuille-Rayleigh-Bénard Convection
The flow in a channel heated from in the mixed convection regime is known as Poiseuille-Rayleigh-Benard convection (PRBC). A fluid test rig has been designed and fabricated mainly by SLA additive manufacturing to investigate the flow of PRBC flow. Simultaneous particle image velocimetry (PIV) and laser-induced fluorescence (PLIF) have been used to measure the velocity and temperature field.
Spray and Atomization
Optical Measurement Methods: Shadowgraph Imaging
Different patterns and atomization properties of the liquid sheet formed by the impinging of the liquid jets. I investigated the effect of the different misalignments like lateral misalignment in colliding, the difference in the velocity of the two jets, and the variation in the diameter of the two colliding jets on the different characteristics of the liquid sheet-like break-up length and properties of the droplets like SMD using shadowgraph imaging.
Design and Fabrication of Fluid Systems
Designed and manufactured an automated feeding system for supplying precise liquid quantities to injectors within an injector test rig. The system circulates the liquid within the setup and regulates both flow rate and pressure. Additionally, the system is equipped to maintain a consistent pressure level over extended durations, enhancing the accuracy and repeatability of injector performance assessments.
Designed and manufactured an aerosol generator optimized for flow visualization purposes, efficiently producing high-volume aerosols serving as the seeding particle source for particle image velocimetry (PIV) within gaseous environments. Notably, the system minimizes gas volume while generating high liquid volume aerosols, reducing disruption to tested gaseous flow during experiments.
Flow Over Porous Objects
Optical Measurement Methods: 2D PIV and 3D tomographic PIV
In this investigation, we utilized both 2D and 3D particle image velocimetry (PIV) to measure the velocity field to examine the flow patterns over porous geometries, including cubes and spheres. The primary objective of our study was to quantify the drag coefficient. The research further focused on an exploration of various permeabilities to see their impact on the wake characteristics of the flow over the porous objects.
Other Optical Measurements
Schlieren Imaging
Using Schlieren imaging and visualization of the flow due to breathing we can see the difference between different types of the face masks.
N95 Mask
Cloth Mask
Blowing the flame through a cloth mask
Temperature Sensitive Paints (TSP)
Developed temperature-sensitive paint (TSP), a fluorescent-based paint specifically designed for measuring temperature distribution on solid surfaces. TSP offers a reliable method for visualizing temperature variations, aiding in the assessment of thermal patterns and gradients across surfaces.
