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Open AccessArticle

Influence of Second Viscosity on Pressure Pulsation

Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Appl. Sci. 2019, 9(24), 5444;
Received: 13 November 2019 / Revised: 4 December 2019 / Accepted: 6 December 2019 / Published: 12 December 2019
(This article belongs to the Section Mechanical Engineering)
A mathematical model of pulsating flow is proposed in the paper. The model includes more accurate description of energy dissipation, so it allows, for example, better stability analysis of water power plant control and more effective operation. Flow in a pipeline system is usually treated as a one-dimensional flow. This is also applied for more difficult cases of the Newtonian and non-Newtonian liquids simulations in the rigid or flexible pipes. Computational simulations of pressure pulsations in pipelines often predict lower damping than what the experimental results show. This discrepancy can be caused by neglecting one of the important damping mechanisms. The second viscosity describes the energy losses due to the compressibility of the liquid. Its existence and use in the computations specifies the real pulsations damping descriptions and predictions. A frequency dependent model of pressure pulsations including second viscosity is introduced. The second viscosity is determined from the system eigenvalue. The experiments were performed with water for low frequencies (from 0.1 to 1 kHz). This area is not fully covered by the current available research results. View Full-Text
Keywords: second viscosity; bulk viscosity; damping; attenuation; pressure pulsation; frequency domain second viscosity; bulk viscosity; damping; attenuation; pressure pulsation; frequency domain
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MDPI and ACS Style

Himr, D.; Habán, V.; Fialová, S. Influence of Second Viscosity on Pressure Pulsation. Appl. Sci. 2019, 9, 5444.

AMA Style

Himr D, Habán V, Fialová S. Influence of Second Viscosity on Pressure Pulsation. Applied Sciences. 2019; 9(24):5444.

Chicago/Turabian Style

Himr, Daniel; Habán, Vladimír; Fialová, Simona. 2019. "Influence of Second Viscosity on Pressure Pulsation" Appl. Sci. 9, no. 24: 5444.

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