Next Article in Journal
A Simplified Analytical Approach for Optimal Planning of Distributed Generation in Electrical Distribution Networks
Previous Article in Journal
A New Method of Two-stage Planetary Gearbox Fault Detection Based on Multi-Sensor Information Fusion
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; https://doi.org/10.3390/app9245444
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
Show Figures

Figure 1

MDPI and ACS Style

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

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop