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6 results on '"Smith, Jonathan David"'

1. Droplet mobility on lubricant-impregnated surfaces

Author

Massachusetts Institute of Technology. Department of Chemical Engineering, Massachusetts Institute of Technology. Department of Mechanical Engineering, Massachusetts Institute of Technology. Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology. School of Engineering, Smith, Jonathan David, Dhiman, Rajeev, Anand, Sushant, Reza-Garduno, Ernesto, Cohen, Robert E., McKinley, Gareth H., Varanasi, Kripa K., Varanasi, Kripa K, Smith, Jonathan David, S.M. Massachusetts Institute of Technology, Massachusetts Institute of Technology. Department of Chemical Engineering, Massachusetts Institute of Technology. Department of Mechanical Engineering, Massachusetts Institute of Technology. Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology. School of Engineering, Smith, Jonathan David, Dhiman, Rajeev, Anand, Sushant, Reza-Garduno, Ernesto, Cohen, Robert E., McKinley, Gareth H., Varanasi, Kripa K., Varanasi, Kripa K, and Smith, Jonathan David, S.M. Massachusetts Institute of Technology

Abstract

Non-wetting surfaces containing micro/nanotextures impregnated with lubricating liquids have recently been shown to exhibit superior non-wetting performance compared to superhydrophobic surfaces that rely on stable air–liquid interfaces. Here we examine the fundamental physico-chemical hydrodynamics that arise when droplets, immiscible with the lubricant, are placed on and allowed to move along these surfaces. We find that these four-phase systems show novel contact line morphology comprising a finite annular ridge of the lubricant pulled above the surface texture and consequently as many as three distinct 3-phase contact lines. We show that these distinct morphologies not only govern the contact line pinning that controls droplets' initial resistance to movement but also the level of viscous dissipation and hence their sliding velocity once the droplets begin to move., United States. Defense Advanced Research Projects Agency. Young Faculty Award, Massachusetts Institute of Technology. Energy Initiative, National Science Foundation (U.S.). CAREER Award (0952564)

Published
2013

3. Relationships between Water Wettability and Ice Adhesion

Author

Massachusetts Institute of Technology. Department of Chemical Engineering, Massachusetts Institute of Technology. Department of Mechanical Engineering, Massachusetts Institute of Technology. Laboratory for Manufacturing and Productivity, Meuler, Adam J., Smith, Jonathan David, Varanasi, Kripa K., McKinley, Gareth H., Cohen, Robert E., Mabry, Joseph M., Varanasi, Kripa, McKinley, Gareth H, Cohen, Robert E, Massachusetts Institute of Technology. Department of Chemical Engineering, Massachusetts Institute of Technology. Department of Mechanical Engineering, Massachusetts Institute of Technology. Laboratory for Manufacturing and Productivity, Meuler, Adam J., Smith, Jonathan David, Varanasi, Kripa K., McKinley, Gareth H., Cohen, Robert E., Mabry, Joseph M., Varanasi, Kripa, McKinley, Gareth H, and Cohen, Robert E

Abstract

Air Force Research Laboratory (Wright-Patterson Air Force Base, Ohio). Propulsion Directorate, United States. Air Force Office of Scientific Research, Chevron Corporation, Massachusetts Institute of Technology. Dept. of Mechanical Engineering

Published
2013

4. Frost formation and ice adhesion on superhydrophobic surfaces

Author

Massachusetts Institute of Technology. Department of Mechanical Engineering, Massachusetts Institute of Technology. Laboratory for Manufacturing and Productivity, Varanasi, Kripa K., Smith, Jonathan David, Deng, Tao, Hsu, Ming, Bhate, Nitin, Varanasi, Kripa, Massachusetts Institute of Technology. Department of Mechanical Engineering, Massachusetts Institute of Technology. Laboratory for Manufacturing and Productivity, Varanasi, Kripa K., Smith, Jonathan David, Deng, Tao, Hsu, Ming, Bhate, Nitin, and Varanasi, Kripa

Abstract

We study frost formation and its impact on icephobic properties of superhydrophobic surfaces. Using an environmental scanning electron microscope, we show that frost nucleation occurs indiscriminately on superhydrophobic textures without any particular spatial preference. Ice adhesion measurements on superhydrophobic surfaces susceptible to frost formation show increased adhesion over smooth surfaces with a strong linear trend with the total surface area. These studies indicate that frost formation significantly compromises the icephobic properties of superhydrophobic surfaces and poses serious limitations to the use of superhydrophobic surfaces as icephobic surface treatments for both on-ground and in-flight applications., GE Global Research Center (Nanotechnology Advanced Technology Program), d'Arbeloff Fund for Excellence in Education, Reed Award

Published
2013

5. Exploring the use of technical indicators as pricing guides in feeder cattle production criteria

Author

Smith, Jonathan David and Agricultural Economics

Subjects
LD5655.V855 1989.S649, Cattle -- Feeding and feeds -- Economic aspects, Feed utilization efficiency
Abstract

The objective of this study was to examine the use of technical indicators, in an econometric context, as guides in making pricing decisions relative to feeder cattle production. Technical indicators were developed for both the short and long term. Short term indicators were designed to capture divergence/convergence between the Relative Strength Index and the futures price stream to form the Price Linked to Divergence index. A long term indicator using an average difference in price over a longer period was developed to form the Price Linked to Trend index. These indicators were used in the econometric models which in conjunction with cash production costs formed a hold/price/sell decision framework. Analysis was conducted on fall-to-spring, spring-to-fall, and fall-to-fall production programs. Results for the three production programs in both the in and out-of-sample environments showed that on average a futures price in the top half of the futures price range was captured. This resulted in average improvement in returns through hedging for every program. Master of Science

Published
1989

6. Droplet mobility on lubricant-impregnated surfaces

Author

Gareth H. McKinley, Kripa K. Varanasi, Rajeev Dhiman, J. David Smith, Sushant Anand, Robert E. Cohen, Ernesto Reza-Garduno, Massachusetts Institute of Technology. Department of Chemical Engineering, Massachusetts Institute of Technology. Department of Mechanical Engineering, Massachusetts Institute of Technology. Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology. School of Engineering, Smith, Jonathan David, Dhiman, Rajeev, Anand, Sushant, Reza-Garduno, Ernesto, Cohen, Robert E., McKinley, Gareth H., and Varanasi, Kripa K.

Subjects
Viscous dissipation, Materials science, Contact line, Nanotechnology, General Chemistry, Surface finish, Lubricant, Composite material, Condensed Matter Physics, Ridge (differential geometry)
Abstract

Non-wetting surfaces containing micro/nanotextures impregnated with lubricating liquids have recently been shown to exhibit superior non-wetting performance compared to superhydrophobic surfaces that rely on stable air–liquid interfaces. Here we examine the fundamental physico-chemical hydrodynamics that arise when droplets, immiscible with the lubricant, are placed on and allowed to move along these surfaces. We find that these four-phase systems show novel contact line morphology comprising a finite annular ridge of the lubricant pulled above the surface texture and consequently as many as three distinct 3-phase contact lines. We show that these distinct morphologies not only govern the contact line pinning that controls droplets' initial resistance to movement but also the level of viscous dissipation and hence their sliding velocity once the droplets begin to move., United States. Defense Advanced Research Projects Agency. Young Faculty Award, Massachusetts Institute of Technology. Energy Initiative, National Science Foundation (U.S.). CAREER Award (0952564)

Published
2012

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