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Relative and interactive effects of fluid's physicochemical characteristics on the incipient motion of a granular particle under laminar flow condition

Xiao, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1061/(ASCE)HY.1943-7900.0001451
  3. Publisher: American Society of Civil Engineers (ASCE) , 2018
  4. Abstract:
  5. This paper presents an experimental research for studying the relative and interactive effects of three physicochemical fluid characteristics (viscosity, pH, and ionic strength) on the incipient motion of a granular particle under laminar flow condition. Critical flow velocity for particle's incipient motion, an important factor for evaluating flow-induced soil erosion, was used to quantify the relative erosive capacity of the test fluids. Response surface methodology (RSM), a statistical design of experiments, was used to design and implement 20 test fluids with various levels of the three fluid characteristics. Incipient motion of a highly spherical glass bead positioned atop a specially designed and manufactured support pocket within an enclosed flow cell was observed using a microscope video camera. The critical flow velocity was quantified for seven repeat trials for each of the 20 test fluids. Regression analyses were conducted on the results to generate a statistical model to describe the relative effects of the three factors and their interactions. The main findings include: (1) viscosity, pH, and their two-way interaction were determined to be the most influencing factors on critical velocity; (2) the effects of the three fluid characteristics on critical velocity follow the following decreasing order: viscosity, pH, and ionic strength; (3) viscosity and pH were both shown to have an inverse relationship with critical velocity; and (4) at higher pH (such as 10.5), the viscosity has greater influence on critical velocity than at a lower pH (such as 3.5). © 2018 American Society of Civil Engineers
  6. Keywords:
  7. Design of experiments ; Flow velocity ; Ionic strength ; Laminar flow ; Particles (particulate matter) ; Regression analysis ; Velocity ; Video cameras ; Viscosity ; Critical flow velocity ; Design and implements ; Experimental research ; Laminar flow conditions ; Physicochemical characteristics ; Response surface methodology ; Statistical design of experiments ; Statistical modeling ; pH effects
  8. Source: Journal of Hydraulic Engineering ; Volume 144, Issue 5 , 2018 ; 07339429 (ISSN)
  9. URL: https://ascelibrary.org/doi/abs/10.1061/(ASCE)HY.1943-7900.0001451