Cross-sectional area variation as a key factor for pressure wave attenuation in hilarious flows: a theoretical analysis.
Credit: International Journal by Multiphase Flow (2025). doi:10.1016/j.ijmultiphaseflow.2025.105138
Pressure waves propagating through the liquid containing bubbles in the tube experience considerable decay. Researchers at Tsukuba University have derived an equation explaining this phenomenon, showing that variations in the tube cross-sectional area contribute to wave attenuation, beyond the viscosity and compressibility of the liquid.
Their analysis reveals that the rate of change in tube cross-sectional area represents an important parameter governing pressure wave attenuation in such systems.
Pressure waves propagating through the liquid containing bubbles in a tube, known as “bubble flow,” behave clearly as in one-phase liquid, requiring accurate understanding and control of the propagation process.
Pressure wave attenuation is particularly important in characterizing these propagation dynamics, requiring clear identification of attenuation factors and mechanisms. The cheerful flow pressure waves are known to be very sensitive to changes in tube cross-sectional area, but the underlying damping mechanism remains unresolved.
In their work published in The International Journal of Multiphase Flow, researchers from Tsukuba University developed an equation explaining the pressure wave propagation of hilarious flows through tubes with varying cross-sectional areas.
Their analysis confirmed that changes in tube cross-sectional area contribute to pressure wave attenuation in the hilarious flow. Quantitative comparisons with other damping factors, such as liquid phase viscosity and compression ratio, revealed that the velocity of change in the tube cross-sectional area is an important parameter governing pressure wave attenuation.
This study advances a fundamental understanding of pressure wave attenuation in hilarious flows. Furthermore, since the equation corresponds to tubes of any cross-sectional shape, there is promising application for bubble generation utilizing convergence-induced tubes with sudden variability in cross-sectional area.
Details: Watanabe Kent et al., elucidating pressure wave attenuation due to changes in cross-sectional area of cheerful flows, international multiphase flow rate (2025). doi:10.1016/j.ijmultiphaseflow.2025.105138
Provided by Tsukuba University
Quote: Cross-sectional area variation as a key factor for pressure wave attenuation in cheerful flow: Theoretical analysis (April 9, 2025) April 10, 2025 https://phys.org/news/2025-04-Sectual Areas – Variables – Key Factors.
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