Settling Characteristics of Modified Rectangular Prisms Public Deposited

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  • February 28, 2019
  • Sheaffer, Alan W.
    • Affiliation: Gillings School of Global Public Health, Department of Environmental Sciences and Engineering
  • Numerous researchers have attempted to develop a general expression to predict drag forces on orthotropic shapes. In a recent doctoral project, David Johnson developed an empirical equation to estimate the shape resistance factor, K, for rectangular prisms. In this study, Johnson's equation is tested using orthotropic shapes different from those in the developmental data set. Prisms with truncated corners, perforated prisms, and prisms with length-to-width ratios > 5 were settled in viscous oil to obtain observed K values for comparison with values estimated by the equation. For the prisms with truncated corners and perforated prisms, the estimated K values were within 9% of observed values. Experiments using elongated prisms showed that differences between observed and estimated K values increased proportionally to a shape number, [A2/(BC)]2, where A is the vertical dimension, and B and C are horizontal dimensions of the prism.
Date of publication
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Rights statement
  • In Copyright
  • Harris, Robert L.
  • Martonen, Ted B.
  • Leith, David
  • Master of Science in Environmental Engineering
Academic concentration
  • Industrial Hygiene
Degree granting institution
  • University of North Carolina at Chapel Hill
Graduation year
  • 1985
Deposit record
  • 5813fd5f-e783-4ad5-a7c4-b2c0322b3c6e

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