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8124 results in Fluid dynamics and solid mechanics

Page 82 of 407

  • 1 - Introduction to Analysis of Low-Speed Impact

  • W. J. Stronge, University of Cambridge
  • Book:
    Impact Mechanics
    Published online:
    19 October 2018
    Print publication:
    15 November 2018, pp 1-20
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  • ANZ VOLUME 60 ISSUE 2 COVER AND BACK MATTER

  • Journal:
    The ANZIAM Journal / Volume 60 / Issue 2 / October 2018
    Published online by Cambridge University Press:
    13 November 2018, pp. b1-b6
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  • ANZ VOLUME 60 ISSUE 2 COVER AND FRONT MATTER

  • Journal:
    The ANZIAM Journal / Volume 60 / Issue 2 / October 2018
    Published online by Cambridge University Press:
    13 November 2018, pp. f1-f2
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  • FREE-SURFACE DYNAMICS OF THIN SECOND-GRADE FLUID OVER AN UNSTEADY STRETCHING SHEET

  • Part of
  • S. PANDA, K. K. PATRA, M. SELLIER
  • Journal:
    The ANZIAM Journal / Volume 60 / Issue 2 / October 2018
    Published online by Cambridge University Press:
    05 November 2018, pp. 249-268
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  • We derive an evolution equation for the free-surface dynamics of a thin film of a second-grade fluid over an unsteady stretching sheet using long-wave theory. For the numerical investigation of the viscoelastic effect on the thin-film dynamics, a finite-volume approach on a uniform grid with implicit flux discretization is applied. The present results are in excellent agreement with results available in the literature for a Newtonian fluid. We observe that the fluid thins faster with the rapid stretching rate of the sheet, but the second-grade parameter delays the thinning behaviour of the liquid film.

  • MATHEMATICAL MODELLING OF THE REMOVAL OF ORGANIC MICROPOLLUTANTS IN THE ACTIVATED SLUDGE PROCESS: A LINEAR BIODEGRADATION MODEL

  • Part of
  • MARK I. NELSON, RUBAYYI T. ALQAHTANI, FAISAL I. HAI
  • Journal:
    The ANZIAM Journal / Volume 60 / Issue 2 / October 2018
    Published online by Cambridge University Press:
    05 November 2018, pp. 191-229
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  • Before wastewaters can be released into the environment, they must be treated to reduce the concentration of organic pollutants in the effluent stream. There is a growing concern as to whether wastewater treatment plants are able to effectively reduce the concentration of micropollutants that are also contained in their influent streams. We investigate the removal of micropollutants in treatment plants by analysing a model that includes biodegradation and sorption as the main mechanisms of micropollutant removal. For the latter a linear adsorption model is used in which adsorption only occurs onto particulates.

    The steady-state solutions of the model are found and their stability is determined as a function of the residence time. In the limit of infinite residence time, we show that the removal of biodegradable micropollutants is independent of the processes of adsorption and desorption. The limiting concentration can be decreased by increasing the concentration of growth-related macropollutants. Although, in principle, it is possible that the concentration of micropollutants is minimized at a finite value of the residence time, this was found not to be the case for the particular biodegradable micropollutants considered.

    For nonbiodegradable pollutants, we show that their removal is always optimized at a finite value of the residence time. For finite values of the residence time, we obtain a simple condition which identifies whether biodegradation is more or less efficient than adsorption as a removal mechanism. Surprisingly, we find that, for the micropollutants considered, adsorption is always more important than biodegradation, even when the micropollutant is classified as being highly biodegradable with low adsorption.

Page 82 of 407