Phase Between Pressure and Particle Velocity
This work by Dan Russell is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License . Based on a work at http://www.acs.psu.edu/drussell/demos.html . Additional information about using this content is available at http://www.acs.psu.edu/drussell/Demos/copyright.html . The content of this page was originally posted on January 23, 2017. HTML code was updated for WCAG accessibility and HTML5 compliance on July 30, 2025 . When discussing the behavior of longitudinal plane waves (i.e., sound waves air), the following statements are often made regarding the relative phase between the pressure and the fluid particle velocity[1] Conceptually, this can be a bit tricky to understand. This animation shows a Gaussian pulse wave signal traveling in the positive (forward) direction, from left to right. The particle velocity and pressure are in-phase; positive velocity (moving right) occurs when pressure is positive (compression). The first still frame at r
Phase Between Pressure and Particle Velocity (Plane Longitudinal Waves) When discussing the behavior of longitudinal plane waves (i.e., sound waves air), the following statements are often made regarding the relative phase between the pressure and the fluid particle velocity[1] the pressure and particle velocity are in-phase for a forward traveling (right going) wave, but the pressure and particle velocity have opposite phase for a backward traveling (left going) wave. Conceptually, this can be a bit tricky to understand. Right Going (Forward Traveling) Wave This animation shows a…
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