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Dive into the research topics where Mohammad Mansoor is active.

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Featured researches published by Mohammad Mansoor.


Science Advances | 2017

Self-determined shapes and velocities of giant near-zero drag gas cavities

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

Video: Out of the frying pan: Explosive droplet dynamics

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

Crown sealing and buckling instability during water entry of spheres

Jeremy Marston; Tadd Truscott; Nathan Speirs; Mohammad Mansoor; Sigurdur T. Thoroddsen


Journal of Fluid Mechanics | 2014

Water entry without surface seal: extended cavity formation

Mohammad Mansoor; Jeremy Marston; Ivan U. Vakarelski; Sigurdur T. Thoroddsen


International Communications in Heat and Mass Transfer | 2012

Numerical investigation of fluid flow and heat transfer under high heat flux using rectangular micro-channels☆

Mohammad Mansoor; Kok-Cheong Wong; Mansoor Siddique


Physical Review E | 2013

Impact of granular drops.

Jeremy Marston; Mohammad Mansoor; Sigurdur T. Thoroddsen


Experiments in Fluids | 2014

The onset of cavitation during the collision of a sphere with a wetted surface

Mohammad Mansoor; Jamal Uddin; Jeremy Marston; Ivan U. Vakarelski; Sigurdur T. Thoroddsen


Journal of Fluid Mechanics | 2017

Stable–streamlined and helical cavities following the impact of Leidenfrost spheres

Mohammad Mansoor; Ivan U. Vakarelski; Jeremy Marston; Tadd Truscott; Sigurdur T. Thoroddsen


Bulletin of the American Physical Society | 2016

Cavitation structures formed during the collision of a sphere with an ultra-viscous wetted surface

Mohammad Mansoor; Jeremy Marston; Jamal Uddin; G.F. Christopher; Z. Zhang; Sigurdur T. Thoroddsen


Bulletin of the American Physical Society | 2017

Out of the frying pan: Explosive droplet dynamics

Jeremy Marston; Chao Li; Tadd Truscott; Mohammad Mansoor

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Sigurdur T. Thoroddsen

King Abdullah University of Science and Technology

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Ivan U. Vakarelski

King Abdullah University of Science and Technology

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Jamal Uddin

University of Birmingham

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Aditya Jetly

King Abdullah University of Science and Technology

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Andres A. Aguirre-Pablo

King Abdullah University of Science and Technology

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Chao Li

Texas Tech University

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Dominic Henry

University of Birmingham

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