Ziqiang Yang

King Abdullah University of Science and Technology (KAUST), Mechanical Engineering, Graduate Student

The Petroleum Institute, Mechanical Engineering, Graduate Student

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Mr. Ziqiang Yang earned his Bachelor degree in Process Equipment & Control Engineering from China University of Petroleum (Beijing) in 2014. Then he obtained his Master's degree in Mechanical Engineering (Thermofluids direction) in Khalifa University of Science and Technology, Sas Al Nakhl Campus, in Abu Dhabi, UAE in 2016. Now Mr. Ziqiang Yang is a PhD student at KAUST working under the supervision of Professor Sigurdur Thoroddsen.
Supervisors: Sigurdur T. Thoroddsen
Address: KAUST, Thuwal, Jedd

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Direct imaging of polymer filaments pulled from rebounding drops

Soft Matter

We present a simple method to deposit stretched polymer fibers between micro-pillars, using impac... more

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On the formation of hydrogen peroxide in water microdroplets

Chemical Science, 2022

A. Gallo Jr, H. Mishra et al., pinpoint the origins of the spontaneous H2O2 formation in water mi... more

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Giant drag reduction on Leidenfrost spheres evaluated from extended free-fall trajectories

Experimental Thermal and Fluid Science, 2018

Vapor layer sustained on the surface of a heated sphere, by the means of the Leidenfrost effect, ... more Vapor layer sustained on the surface of a heated sphere, by the means of the Leidenfrost effect, can dramatically reduce the hydrodynamic drag on the sphere due to an early drag crisis transition. Here we investigate the vapor layer effect on the free fall of heated metallic spheres in a fluorocarbon liquid, FC-72 (perfluorohexane), employing two tall liquid tanks: a 3 meter tall 14 cm wide tank and a 2 meter tall 20 × 20 cm cross-section tank and heater device. These tanks are significantly larger than the tanks used in prior studies. We use highspeed video camera recordings to track extended fall trajectories and to compare the drag on room-temperature no-vapor-layer spheres to that of heated Leidenfrost vapor-layer spheres. Analysis of the extended free-fall trajectories and acceleration based on the sphere dynamic equation of motion enables the accurate evaluation of the vapor-layers-induced drag reduction, without the need for extrapolation. We demonstrate that the drag on the Leidenfrost sphere in FC-72, can be as low as CD = 0.04 ± 0.01, or an order of magnitude lower than the values for the no vapor layer spheres in the subcritical Reynolds numbers range. This drag reduction extends into the supercritical Reynolds number range. The analysis method developed herein to describe the sphere trajectories can be applied in other related studies. Results of this study are expected to stimulate the development on energy saving drag reduction technologies based on lubricating gas layers.

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Poster: The Singularity Is Near

72th Annual Meeting of the APS Division of Fluid Dynamics - Gallery of Fluid Motion, Nov 23, 2019

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Direct imaging of polymer filaments pulled from rebounding drops

Soft Matter

We present a simple method to deposit stretched polymer fibers between micro-pillars, using impac... more

Download

On the formation of hydrogen peroxide in water microdroplets

Chemical Science, 2022

A. Gallo Jr, H. Mishra et al., pinpoint the origins of the spontaneous H2O2 formation in water mi... more

Download

Giant drag reduction on Leidenfrost spheres evaluated from extended free-fall trajectories

Experimental Thermal and Fluid Science, 2018

Download

Poster: The Singularity Is Near

72th Annual Meeting of the APS Division of Fluid Dynamics - Gallery of Fluid Motion, Nov 23, 2019

Download

Ziqiang Yang

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