Browse by Author "Gioia, Gustavo"

  • Gioia, Gustavo; Bombardelli, Fabian A. (American Physical Society, 2005)
    In many applications a sustained, localized turbulent flow scours a cohesionless granular bed to form a pothole. Here we use similarity methods to derive a theoretical formula for the equilibrium depth of the pothole. ...

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  • Gioia, Gustavo; Bombardelli, Fabian A. (Department of Theoretical and Applied Mechanics (UIUC), 2005-05)
    In many applications a sustained, localized turbulent flow scours a cohesionless granular bed to form a pothole. Here we use similarity methods to derive a theoretical formula for the equilibrium depth of the pothole. ...

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  • Hill, Kimberly M.; Gioia, Gustavo; Amaravadi, Deepak R. (American Physical Society, 2004-11)
    We model the radial segregation patterns that form in a thin rotating drum partially filled with beads of two sizes. We predict that the waviness (or amplitude-to-wavelength ratio, denoted w) of a pattern should be subjected ...

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  • Hill, Kimberly M.; Gioia, Gustavo; Amaravadi, Deepak R. (Department of Theoretical and Applied Mechanics (UIUC), 2004-12)
    We model the radial segregation patterns that form in a thin rotating drum partially filled with beads of two sizes. We predict that the waviness (or amplitude-to-wavelength ratio, denoted w) of a pattern should be subjected ...

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  • Hill, Kimberly M.; Gioia, Gustavo; Tota, Vinay V. (American Physical Society, 2003)
    We show that the structure of a dense, free-surface boundary layer granular flow is similar to the structure of a laminar liquid flow: There is a strong component of order (stratification parallel to the mean flow) ...

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  • Hill, Kimberly M.; Gioia, Gustavo; Tota, Vinay V. (Department of Theoretical and Applied Mechanics (UIUC), 2003-08)
    We show that the structure of a dense, free-surface boundary layer granular flow is similar to the structure of a laminar liquid flow: there is a strong component of order (stratification parallel to the mean flow) ...

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  • Gioia, Gustavo; Dai, Xiangyu (Department of Theoretical and Applied Mechanics (UIUC), 2005-08)
    Very recent experiments indicate that in free-standing metallic films of constant grain size the initial yield stress increases as the film becomes thinner, it peaks for a thickness on the order of 100 nm, and then starts ...

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  • Gioia, Gustavo; Chakraborty, Pinaki (American Physical Society, 2006)
    The classical experiments on turbulent friction in rough pipes were performed by Nikuradse in the 1930s. Seventy years later, they continue to defy theory. Here we model Nikuradse’s experiments using the phenomenological ...

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  • Gioia, Gustavo; Chakraborty, Pinaki (Department of Theoretical and Applied Mechanics (UIUC), 2005-08)
    The classical experiments on turbulent friction in rough pipes were performed by J. Nikuradse in the 1930s. Seventy years later, they continue to defy theory. Here we model Nikuradse’s experiments using the phenomenological ...

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  • Gioia, Gustavo; Cuitiño, Alberto M. (Department of Theoretical and Applied Mechanics (UIUC), 2001-05)
    When poured into a container, cohesive granular materials form low-density, open granular aggregates. If pressed upon with a ram, these aggregates densify by particle rearrangement. In this paper we introduce experimental ...

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  • Gioia, Gustavo; Cuitiño, Alberto M.; Zheng, S.; Uribe, T. (American Physical Society, 2002)
    When poured into a container, cohesive granular materials form low-density, open granular aggregates. If pressure is applied to these aggregates, they densify by particle rearrangement. Here we introduce experimental and ...

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  • Chakraborty, Pinaki; Gioia, Gustavo; Kieffer, Susan (Department of Theoretical and Applied Mechanics (UIUC), 2005-09)
    Photographs of a volcanic column in a recent eruption of Reventador show a prominently scalloped umbrella that is unlike any umbrella previously documented on a volcanic column. We propose that the scallops in this umbrella ...

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