Higher Reynolds numbers yield broader, higher-frequency jet noise than lower ones

Evidence

Faster jets (higher Reynolds number, > 10, 000) are very turbulent, with a wide spectrum of sound emanating from the jet. At lower Reynolds numbers, the eddies are larger, less frequent, and give rise to noise that emphasizes lower frequencies. — Eric J. Heller, Why You Hear What You Hear- An…, 1336

Categorization

Category: Causal Relationships

Related

• Jet turbulence noise shifts from high to low frequencies as eddies decay downstream (similarity 0.91)
• Jet instability makes some noise from fast air streams physically unavoidable (similarity 0.83)
• Fast air jets are inherently unstable and inevitably produce sound (similarity 0.83)
• Turbulent jet noise is scale-invariant across 256-fold size differences (similarity 0.81)
• A free jet generates periodic vortices without any resonator (similarity 0.80)
• A jet’s natural instability produces noise unless vortices periodicize (similarity 0.79)

Broader Connections

• Turbulence-generated sound is scale-invariant when time is stretched proportionally #expands (0.75) — Eric J. Heller, Why You Hear What You Hear- An…, 1342