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Transient supersonic jets :
Transient supersonic jets :
The sudden emergence of starting supersonic jets typically consists of a precursor shock/blast wave, compressible vortex ring, and a supersonic jet. Understanding of these complex flows is important concerning several industrial applications, for instance, gun muzzle blasts, pulsed-detonation engines and starting plumes from rocket boosters. We are planning to design and build an open/closed shock tube facility to study the transient supersonic flows and shock wave interactions. Several state-of-the-art experimental techniques such as Particle Image Velocimetry (PIV) and Tomographic Background- Oriented Schlieren (BOS) will be developed to characterize the flow. Furthermore, we will perform numerical simulations to support the experimental data.
The sudden emergence of starting supersonic jets typically consists of a precursor shock/blast wave, compressible vortex ring, and a supersonic jet. Understanding of these complex flows is important concerning several industrial applications, for instance, gun muzzle blasts, pulsed-detonation engines and starting plumes from rocket boosters. We are planning to design and build an open/closed shock tube facility to study the transient supersonic flows and shock wave interactions. Several state-of-the-art experimental techniques such as Particle Image Velocimetry (PIV) and Tomographic Background- Oriented Schlieren (BOS) will be developed to characterize the flow. Furthermore, we will perform numerical simulations to support the experimental data.
Transient supersonic jet: Numerical schlieren showing precursor shock/blast wave, compressible vortex ring, and a supersonic jet
Blast wave dynamics:
Blast wave dynamics:
Mitigation of blast waves is of utmost importance in many industrial and military applications. These applications include blast wave propagation in underground military shelters and tunnels, large-scale explosions due to industrial accidents, and precursor shocks during the start-up of a launch vehicle. Moreover, in recent decades, the blast waves generated from the improved explosive devices have been regarded as the leading cause of injuries to military personnel as well as civilians. Therefore, mitigating the strength of blast waves can potentially safeguard the critical infrastructure and reduce the possible casualties or injuries in any given scenario. Accurate estimation of the flow physics is needed for designing new protective devices against blast loading. Therefore, this project aims to fill this knowledge gap by understanding the intricate flow structures that are responsible for shock wave mitigation using the state-of-the-art flow-diagnostic tools. In addition, we will investigate and propose models for the propagation of decaying of shock/blast waves using state-of the-art measurement tools (PIV, BOS, etc.,).
Mitigation of blast waves is of utmost importance in many industrial and military applications. These applications include blast wave propagation in underground military shelters and tunnels, large-scale explosions due to industrial accidents, and precursor shocks during the start-up of a launch vehicle. Moreover, in recent decades, the blast waves generated from the improved explosive devices have been regarded as the leading cause of injuries to military personnel as well as civilians. Therefore, mitigating the strength of blast waves can potentially safeguard the critical infrastructure and reduce the possible casualties or injuries in any given scenario. Accurate estimation of the flow physics is needed for designing new protective devices against blast loading. Therefore, this project aims to fill this knowledge gap by understanding the intricate flow structures that are responsible for shock wave mitigation using the state-of-the-art flow-diagnostic tools. In addition, we will investigate and propose models for the propagation of decaying of shock/blast waves using state-of the-art measurement tools (PIV, BOS, etc.,).
Blast mitigation studies
Blast decay measurements
PIV measurements in Compressible flows:
PIV measurements in Compressible flows:
Shock-tube facility -PIV measurements
My previous work at Johns Hopkins:
My previous work at Johns Hopkins:
Effect of aerosols on human respiratory system:
Effect of aerosols on human respiratory system:
In the human body, the airways are at an air-liquid interface where the first barrier to aerosols or Particulate matter is the epithelial monolayer. Understanding how toxic aerosols affect the function of the epithelium is vital in developing novel therapeutics aimed at preventing and reversing airway disease pathogenesis. The current state-of-the-art in vitro exposure chambers for aerosol exposure lack direct optical access. Moreover, the cells must be removed from the chamber for microscopic measurements, which may induce undesirable stress to the cells. With the collaboration from Johns Hopkins School of Medicine, we designed a novel device for in-situ assessment of cell-response during aerosol exposure. Furthermore, advanced optical diagnostic techniques such as PIV, fluorescence, and contrast microscopy were used to understand the cell migration and cilia motion of lung epithelial cells during aerosol exposure.
In the human body, the airways are at an air-liquid interface where the first barrier to aerosols or Particulate matter is the epithelial monolayer. Understanding how toxic aerosols affect the function of the epithelium is vital in developing novel therapeutics aimed at preventing and reversing airway disease pathogenesis. The current state-of-the-art in vitro exposure chambers for aerosol exposure lack direct optical access. Moreover, the cells must be removed from the chamber for microscopic measurements, which may induce undesirable stress to the cells. With the collaboration from Johns Hopkins School of Medicine, we designed a novel device for in-situ assessment of cell-response during aerosol exposure. Furthermore, advanced optical diagnostic techniques such as PIV, fluorescence, and contrast microscopy were used to understand the cell migration and cilia motion of lung epithelial cells during aerosol exposure.
Lung cell exposure chamber
Lung cell exposure chamber
Cillia motion
Migration of bronchial epithelial cells
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