Hayley H. Shen
Professor
132 Rowley Lab
Clarkson University
PO Box 5755
Potsdam, NY 13699-5710
Phone: 315-268-6614
Fax: 315-268-7985
E-mail: hhshen@clarkson.edu
Research site
CV
Education
B.Sc., National Taiwan University (1972)
M.S., University of Iowa (1974)
Ph.D., University of Iowa (1976) Clarkson University (1982)
Teaching
Dr. Shen is a faculty advisor for the Tau Beta Pi and Chi-Epsilon. She is also the associate director of Clarkson's Honors Program.
Courses taught include:
Graduate
Coastal Engineering, Advanced Fluid Mechanics, Groundwater and Seepage, Sediment Transport, River and Estuarine Hydraulics, Hydrodynamic Dispersion, Continuum Mechanics, Nonlinear Mechanics, Discrete Element Method
Undergraduate
Statics, Dynamics, Engineering for Non-Engineers, Introduction to Fluid Mechanics, Introduction to Engineering Use of Computers, Calculus II, Elementary Differential Equation, Fourier Series and Boundary Value Problems, Chaos and Coherency (Honors Science Course), Climate Change Impacts on Cold Regions (Honors Science Course)
Research Interests
Dr. Shen's research areas are in mechanics of discrete system, applications to sea ice dynamics and particulate materials in general. Below are several current project areas.
Pancake Ice Formation
Pancake ice is the first form of sea ice cover in most part of the polar and sub-polar oceans. Their formation is associated with waves. The size and thickness, the internal structure of the pancake ice affect heat and momentum transfer between air and ocean, and the marine biology that lives off the sea ice. This study utilizes field observations in the Arctic and Antarctic, as well as laboratories in the US and Germany. The picture shows two researchers picking up pancake ice samples from the Southern Ocean.
Transitional Granular Flows
Granular materials can behave like a solid as in a sand pile, a liquid as in a landslide, or a gas as in a dust storm. Many industrial applications require processing granular materials that can only be design by trial-and-error. This is because unlike a regular fluid, granular materials can "solidify, melt, and evaporate" abruptly. Many industries suffer equipment failure due to the lack of understanding of how granular materials transition from one regime to the other. Future human explorations to the moon and Mars require in-situ resource utilization that challenges a greater understanding and thus control and processing of granular materials. The picture shows flow of electro-statically charged particles flowing in a pipe system.
Scaling Laws in Granular Shear Flows
Discrete Element Method (DEM) has been used successfully to simulate granular flows. However, the particle count limitation is a perpetual constraint. For any ordinary granular system such as shoveling a sand pile, it is common to have particle numbers on the order of 1015, which requires 4-5 orders of magnitude more memory storage than is available in the largest super-computers. Coarsening of particles so that larger virtual particles can replace the actual size of the small particles is an effective way to deal with this problem. We are currently developing the guidelines for the coarsening strategy.
Selected Publications
Orlando, A. and Shen, H.H. (2010) Effect of rolling friction on binary collisions of spheres, Physics of Fluids, 22(3). DOI: 10.1063/1.3349728
Wang, R. and Shen, H.H. (2010) Gravity waves propagating into ice-covered ocean: a visco-elastic model. Journal of Geophysical Research - Oceans, 115(C06024)
doi:10.1029/2009JC005591.
Wang, R. and Shen, H.H. (2010) Experimental study on surface wave propagating through a grease-pancake ice mixture. Cold Regions Science and Technology, doi:10.1016/j.coldregions.2010.01.011.
Helenbrook, B. T., Powers, M., Shen, H. H., and Metzger, P. T. (2009) Modeling and Discrete Element Simulations of Elastic-Quasi-Static Granular Flow in a Compressing Slot, ASCE J. Aerospace Engineering, 22(4):415-422, doi 10.1061/(ASCE)0893-1321(2009)22:4(415))
Ji, S, Hanes, D.M., and Shen, H.H. (2009) Comparisons of Physical Experiment and Discrete Element Simulations of Sheared Granular Materials in an Annular Shear Cell, Int. Journal Mechanics of Materials. Doi:10.1016/j. mechmat 2009 01 029, 41(6):764-776.
Ji, S. and Shen, H.H. (2008) Internal Parameters and Regime Map for Soft Polydispersed Granular Materials, J. Rheology. 52(1):87-103, DOI: 10.1122/1.2807441.
