Mohammad Mansoor
King Abdullah University of Science and Technology
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Featured researches published by Mohammad Mansoor.
Science Advances | 2017
Ivan U. Vakarelski; Evert Klaseboer; Aditya Jetly; Mohammad Mansoor; Andres A. Aguirre-Pablo; Derek Y. C. Chan; Sigurdur T. Thoroddsen
A gas cavity can reduce the hydrodynamic drag on a falling sphere in liquid to near zero by providing perfect slip conditions. Minimizing the retarding force on a solid moving in liquid is the canonical problem in the quest for energy saving by friction and drag reduction. For an ideal object that cannot sustain any shear stress on its surface, theory predicts that drag force will fall to zero as its speed becomes large. However, experimental verification of this prediction has been challenging. We report the construction of a class of self-determined streamlined structures with this free-slip surface, made up of a teardrop-shaped giant gas cavity that completely encloses a metal sphere. This stable gas cavity is formed around the sphere as it plunges at a sufficiently high speed into the liquid in a deep tank, provided that the sphere is either heated initially to above the Leidenfrost temperature of the liquid or rendered superhydrophobic in water at room temperature. These sphere-in-cavity structures have residual drag coefficients that are typically less than 110 those of solid objects of the same dimensions, which indicates that they experienced very small drag forces. The self-determined shapes of the gas cavities are shown to be consistent with the Bernoulli equation of potential flow applied on the cavity surface. The cavity fall velocity is not arbitrary but is uniquely predicted by the sphere density and cavity volume, so larger cavities have higher characteristic velocities.
70th Annual Meeting of the APS Division of Fluid Dynamics | 2017
Jeremy Marston; Chao Li; Tadd Truscott; Mohammad Mansoor
Submitted for the DFD17 Meeting of The American Physical Society Out of the frying pan: Explosive droplet dynamics JEREMY MARSTON, CHAO LI, Texas Tech University, TADD TRUSCOTT, MOHAMMAD MANSOOR, Utah State University — Regardless of culinary skills, most people who have used a stove top have encountered the result of water interacting with hot oil. The phenomenon is particularly memorable if the result is impingement of hot fluid on one’s skin. Whilst ubiquitous, a deeper probing of this phenomenon reveals a vastly rich dynamical process. We use high-speed imaging to investigate the idealized case of a single water droplet impacting onto a hot oil film. At a qualitative level, we have observed three regimes of fluid ejection – jets, cones and explosive vaporization. The latter of these results in the spectacular creation of aerosol with sizes down to the sub-micrometer range. We present our experimental findings based upon control parameters such as temperature, film thickness and oil type. Jeremy Marston Texas Tech University Date submitted: 20 Jul 2017 Electronic form version 1.4
Journal of Fluid Mechanics | 2016
Jeremy Marston; Tadd Truscott; Nathan Speirs; Mohammad Mansoor; Sigurdur T. Thoroddsen
Journal of Fluid Mechanics | 2014
Mohammad Mansoor; Jeremy Marston; Ivan U. Vakarelski; Sigurdur T. Thoroddsen
International Communications in Heat and Mass Transfer | 2012
Mohammad Mansoor; Kok-Cheong Wong; Mansoor Siddique
Physical Review E | 2013
Jeremy Marston; Mohammad Mansoor; Sigurdur T. Thoroddsen
Experiments in Fluids | 2014
Mohammad Mansoor; Jamal Uddin; Jeremy Marston; Ivan U. Vakarelski; Sigurdur T. Thoroddsen
Journal of Fluid Mechanics | 2017
Mohammad Mansoor; Ivan U. Vakarelski; Jeremy Marston; Tadd Truscott; Sigurdur T. Thoroddsen
Bulletin of the American Physical Society | 2016
Mohammad Mansoor; Jeremy Marston; Jamal Uddin; G.F. Christopher; Z. Zhang; Sigurdur T. Thoroddsen
Bulletin of the American Physical Society | 2017
Jeremy Marston; Chao Li; Tadd Truscott; Mohammad Mansoor