Pulsatile flows of a bingham plastic in circular pipes

Khaled J. Hammad, George Vradis

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Pulsatile flows of a Bingham plastic through a circular pipe have been investigated numerically. The unsteadiness in the studied flow phenomenon is due to a sinusoidal varying pressure gradient component superimposed on a non-zero mean value. These time periodic flows are typical of many pumping operations and manufacturing processes of highly viscous Newtonian and non-Newtonian fluids. Pulsating the flow of a non-Newtonian Bingham plastic leads to time-averaged flow rates that are higher than the ones obtained under steady state conditions. The influence of the governing non-dimensional parameters, i.e. the yield, Reynolds and Strouhal numbers, on both the flow rate enhancement as well as the extra power required to maintain the flow pulsations is investigated. The presented results identify two asymptotic flow regimes. The first is a quasi-steady state one encountered at low frequencies. The other limiting regime, found at the high end of the studied frequency spectrum, leads to time-averaged characteristics identical to those of the steady state case.

Original languageEnglish (US)
Title of host publicationAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
Pages685-690
Number of pages6
Volume237
StatePublished - 1996

Fingerprint

Pulsatile flow
Pipe
Flow rate
Plastics
Strouhal number
Pressure gradient
Reynolds number
Fluids

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Hammad, K. J., & Vradis, G. (1996). Pulsatile flows of a bingham plastic in circular pipes. In American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED (Vol. 237, pp. 685-690)

Pulsatile flows of a bingham plastic in circular pipes. / Hammad, Khaled J.; Vradis, George.

American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. Vol. 237 1996. p. 685-690.

Research output: Chapter in Book/Report/Conference proceedingChapter

Hammad, KJ & Vradis, G 1996, Pulsatile flows of a bingham plastic in circular pipes. in American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. vol. 237, pp. 685-690.
Hammad KJ, Vradis G. Pulsatile flows of a bingham plastic in circular pipes. In American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. Vol. 237. 1996. p. 685-690
Hammad, Khaled J. ; Vradis, George. / Pulsatile flows of a bingham plastic in circular pipes. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. Vol. 237 1996. pp. 685-690
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