Droplet Size Reference Guide
Understand Dv50, Dv90, and VMD โ what they mean, how nozzle type and pressure affect droplet size, and the target ranges for key industrial applications.
Key Terminology
Volume Median Diameter
50% of the total spray volume is contained in droplets smaller than this diameter. This is the most commonly cited single-number droplet size specification.
90th Percentile Diameter
90% of the total spray volume is in droplets smaller than this value. Dv90 characterizes the coarser end of the distribution and is critical when large droplets must be avoided โ such as in humidification or coating.
Volume Mean Diameter
The diameter of a droplet whose volume, if all droplets had that volume, would equal the total spray volume. VMD is closely related to Dv50 but slightly different for non-symmetric distributions.
Droplet Size Lookup
Select nozzle type, pressure, and application to see typical droplet size ranges
Relative Droplet Size โ Your Nozzle vs. Reference Types
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Application Suitability โ This Nozzle Type
Droplet Size Reference Table
Typical Dv50 ranges by nozzle type at standard operating pressures. Actual values vary by orifice size, flow rate, and liquid properties.
| Nozzle Type | Typical Dv50 Range (ยตm) | Pressure Sensitivity | Category | Primary Use Cases |
|---|---|---|---|---|
| Air-Atomizing | 10 โ 100 ยตm | High โ air-to-liquid ratio dominates | Ultra-Fine | Humidification, coating, chemical injection |
| Fine Mist / Fog | 20 โ 150 ยตm | Moderate โ finer at high pressure | Ultra-Fine / Fine | Humidification, dust suppression, evaporative cooling |
| Hollow Cone | 100 โ 600 ยตm | Moderate | Fine / Medium | Dust suppression, evaporative cooling, gas scrubbing |
| Flat Fan | 150 โ 700 ยตm | Moderate โ finer at higher pressure | Medium | Coating, washing, agricultural spray |
| Full Cone | 200 โ 1,000 ยตm | Low to Moderate | Medium / Coarse | Tank filling, washdown, fire suppression, cooling |
| Solid Stream | 1,000 ยตm+ | Low | Very Coarse | Washdown, high-impact cleaning, tank filling |
Application Droplet Size Targets
| Application | Target Dv50 Range | Why Droplet Size Matters | Recommended Nozzle Type |
|---|---|---|---|
| Humidification | 10 โ 50 ยตm | Fine droplets evaporate before reaching surfaces; coarse droplets cause wetting | Air-atomizing, fine mist |
| Dust Suppression | 30 โ 200 ยตm | Droplets must match particle size to agglomerate effectively; too fine = drift | Hollow cone, fine mist |
| Evaporative Cooling | 20 โ 150 ยตm | High surface area maximizes evaporation; must evaporate before surfaces | Fine mist, hollow cone |
| Coating / Finishing | 50 โ 300 ยตm | Uniform coverage; coarse droplets cause runs, fine droplets cause dry spray | Air-atomizing, flat fan |
| Industrial Washdown | 500 โ 2,000+ ยตm | Coarse droplets carry more momentum for surface impact and cleaning | Full cone, flat fan, solid stream |
| Tank Cleaning / CIP | 500 โ 2,000+ ยตm | Impact force and coverage pattern more important than droplet fineness | Full cone, spray balls |
Educational reference only. Droplet size ranges are general guidance based on typical hydraulic nozzle performance. Actual droplet size for a specific nozzle at specific conditions requires independent measurement or NozzlePro application data. Droplet size is influenced by liquid viscosity, surface tension, density, orifice geometry, and operating pressure. Contact NozzlePro for application-specific droplet size guidance.
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