공기 미세분무 vs 초음파 노즐: 산업 선택 가이드

Quick answer: which atomizing nozzle should you start with?

Start with an 이류체 미세분무 노즐 when you need adjustable liquid flow, droplet fineness, pattern, and coverage and compressed air is available. Pressure feed suits stable liquid delivery; siphon or gravity feed can simplify low-flow installations.

Choose an automatic air atomizing nozzle when the spray must follow the machine cycle or when liquid, atomizing air, and shaping air require separate control. Choose an air-driven acoustic or resonant nozzle for low-flow fogging where compressed air excites a resonant head. Jeltecn’s current ultrasonic product is described this way and is classified as air atomization.

A piezoelectric ultrasonic spray nozzle is a separate equipment class. It uses an electrical transducer and resonant vibration and is commonly evaluated for low-flow, low-velocity precision coating.

How air atomization and ultrasonic atomization differ

Two-fluid air atomization uses gas shear

이류체 미세분무 노즐, also called two-fluid nozzles, bring liquid and compressed gas together so the gas breaks the liquid into droplets. Depending on the design, mixing occurs inside the nozzle or outside the liquid orifice. The operating result is controlled by the combination of liquid flow, liquid pressure or feed height, atomizing-air pressure and flow, fluid properties, and the geometry of the air cap and liquid cap.

This control range is why air atomization appears in many unrelated processes. Spraying Systems Co. lists pressure-, siphon-, and gravity-fed setups, clean-out and shut-off options, automatic actuation, and variable designs with independent control of liquid, atomizing air, and fan air. Its technical overview also places the technology in coating, humidifying, lubricating, gas cooling, conditioning, and fogging applications. See the manufacturer’s air atomizing spray-pattern reference.

Increasing the gas-to-liquid momentum generally pushes atomization toward finer droplets, but there is no universal pressure setting that guarantees a particular diameter. The response changes with viscosity, surface tension, density, nozzle setup, liquid rate, and the definition and measurement of “droplet size.” More air can also increase drift, bounce-back, noise, compressor demand, or unwanted disturbance of the target. The best setting is the lowest stable combination that achieves the process result.

“Ultrasonic nozzle” can describe two different mechanisms

The name ultrasonic is not specific enough for purchasing. In a piezoelectric ultrasonic spray system, an electrical transducer converts high-frequency electrical energy into vibration. A liquid film on the atomizing surface forms capillary waves and separates into droplets. Sono-Tek’s technical explanation states that its piezoelectric nozzles atomize at a resonant frequency without relying on high liquid pressure; frequency, liquid density, and surface tension influence the resulting distribution. This is useful background for piezoelectric ultrasonic atomization, but those data should not be transferred to another nozzle architecture.

An air-driven acoustic or resonant nozzle is different. Compressed air moves through a resonant chamber or around a vibrating head, and the acoustic field assists breakup of the liquid. It still requires a compressed-air supply. 그만큼 Jeltecn ultrasonic atomizing nozzle is described on its product page as using compressed air and high-frequency mechanical sound waves, and the page classifies it as “Air Atomization.” That makes the compressed-air operating envelope central to selection.

This distinction prevents three common specification errors: assuming every ultrasonic nozzle needs an electrical generator, assuming every ultrasonic nozzle works without compressed air, and applying a droplet-size claim from a piezoelectric coating system to an air-driven resonant nozzle. Ask the supplier to identify the energy source, liquid-feed method, resonant element, required controls, and validated performance table.

Technology comparison

How the Jeltecn air atomizing and ultrasonic series compare

The figures below are selection references taken from the current product pages, not universal performance guarantees. Flow and spray behavior depend on the exact cap, orifice, feed method, fluid, pressure at the nozzle, and measurement conditions. Confirm the chosen operating point on a model-specific data sheet before releasing a purchase order.

The current pages contain inconsistent units or broad ranges in a few places. 예를 들어, the A100 summary table labels capacity in L/h while the model performance table labels the same figures in ml/min. The comparison above uses the model performance table and flags other ambiguous data for confirmation. A reliable quotation should identify the exact model and operating point rather than copy a category-level maximum.

Select by application, not by nozzle name

Industrial humidification

For room or process-air humidification, calculate the moisture load and the available evaporation time. Visible fog can still wet equipment if droplets reach a surface. Temperature, relative humidity, airflow, mounting height, nozzle spacing, water quality, and control deadband belong in the design.

A pressure- or siphon-fed air atomizing nozzle is a practical starting point when flow must be adjustable. The brass water-mixing series suits installations where brass is compatible and a narrow round pattern is acceptable. Test an air-driven acoustic model under the actual ventilation and humidity conditions.

코팅, 페인트 등, flux, adhesive, and release agent

Coating selection is governed by transfer to the target, not airborne fineness alone. Record wet-film target, line speed, spray width, distance, overlap, edge quality, overspray, and viscosity at operating temperature.

The A100 is a compact automatic option for painting stations. The DK series is the stronger starting point when atomizing and fan gas need independent adjustment or recirculation helps maintain a viscous formulation. Compare a purpose-built piezoelectric system separately for gentle, low-flow thin-film deposition.

Lubrication and oil spraying

Oil viscosity, temperature, mass per cycle, and target speed determine whether siphon feed is stable enough. Reservoir level, pickup height, and line restriction can change siphon flow; pressure feed offers more deliberate control for repeatable dosing.

For fuel or burner service, nozzle selection is only one part of the system. Combustion controls, flame supervision, purge logic, pressure regulation, ventilation, and applicable codes must be approved by the system engineer.

Dust suppression

Dust control depends on air velocity, plume direction, concentration, enclosure geometry, water tolerance, and settling location. Very small droplets may follow the air stream; large droplets may consume water without remaining suspended long enough. A trial should measure visible escape, water addition, housekeeping, and downstream moisture—not just fog appearance.

Seven engineering variables that decide spray performance

1. Liquid properties at the operating condition

Provide viscosity, density, surface tension where available, solids, particle size, temperature, pH, and chemical identity. Include an SDS for regulated liquids. Compatibility must cover every wetted part, seal, tube, and filter—not only the body.

2. Flow per nozzle and total system turndown

State minimum, normal, and maximum flow per nozzle. A wide demand range may be better handled by zoning multiple nozzles. For intermittent spraying, specify volume per shot and cycle rate as well as average flow.

3. Droplet-size definition and evidence

“Average droplet size” is ambiguous. Ask whether a value is D32, Dv50, another percentile, or a visual estimate, and record the liquid, pressure, sampling position, and method. Water data at one operating point do not guarantee oil or coating performance.

4. Spray pattern and coverage at a defined distance

Choose the pattern based on the target. Spray angle alone does not define coverage because air interaction and mounting geometry can distort it. Specify width or diameter at the actual distance, uniformity, edge requirements, and array overlap.

5. Utilities at the nozzle, not only at the compressor

필터, regulators, valves, tubing, and manifolds cause pressure loss. Provide compressed-air pressure and flow at the nozzle under simultaneous operation. Define gas quality, liquid-feed pressure, tank height, pump type, return line, and permissible pulsation.

6. Control response and shut-off quality

Sequence atomizing air, liquid, and shaping air to avoid a heavy first droplet or trailing dribble. Record response time, cycle frequency, transition overspray, and fail-safe state. A clean-out needle is not always the liquid shut-off.

7. Maintenance and verification

Set filtration from the smallest passage and contaminant. Record baseline flow, pattern, and pressure. Check for cap damage, deposits, seal wear, alignment, and supply changes; verify flow or pattern periodically when spray quality is critical.

A practical selection workflow

1. Define the outcome. State the required coating, humidity, 냉각, 매끄럽게 하기, dust-control, or process result and how it will be measured.
2. Fix the operating envelope. Record liquid properties, flow range, spray duration, target distance, environment, and available utilities.
3. Choose the architecture. Decide between pressure feed, siphon/gravity feed, automatic shut-off, air-driven acoustic atomization, or a separate piezoelectric ultrasonic system.
4. Shortlist cap and body options. Match pattern, capacity, connection, material, and control features.
5. Check the complete system. Size filtration, regulation, valves, tubing, liquid feed, controls, ventilation, and safeguards.
6. Validate the operating point. Confirm flow, coverage, transfer or evaporation, and start-stop quality with the actual liquid when the process is sensitive.
7. Freeze the setup. Record model, cap or orifice, pressures, liquid condition, mounting distance, and acceptance criteria.

What to include in an atomizing-nozzle RFQ

A complete request shortens selection time and reduces the risk of receiving a nozzle that makes a fine spray but misses the process objective. Send the following information:

• Application and measurable result: humidity range, coating width, liquid mass per cycle, cooling load, or dust-control target
• Liquid name and SDS where applicable; viscosity at operating temperature; density, surface tension, solids, and particle size if known
• Minimum, normal, and maximum liquid flow per nozzle
• Preferred feed method: pressure tank, pump, siphon, gravity, or recirculation
• Available air pressure and air flow at the nozzle, plus air-quality requirements
• Spray pattern, coverage dimensions, mounting distance, orientation, and number of nozzles
• Droplet-size target with the metric and test condition, or the process result the droplet distribution must achieve
• Continuous or intermittent duty; cycle rate; desired shut-off response
• Wetted-material and seal restrictions, temperature, corrosive exposure, and cleaning method
• Connection standard, installation envelope, quantity, destination, and required documentation

Send Jeltecn your spray requirements for nozzle selection and quotation. If a performance point is safety-critical or difficult to predict, request a test with the actual liquid or a representative fluid before production release.

Frequently asked questions

Does an ultrasonic nozzle always work without compressed air?

아니. Piezoelectric ultrasonic coating nozzles use electrical vibration for atomization and may use only a low-pressure shaping gas, but air-driven acoustic or resonant nozzles require compressed air as part of their operating principle. Confirm which architecture the supplier means.

Is a smaller droplet always better?

아니. Small droplets evaporate faster and can remain suspended, but they also drift more easily and may fail to reach a target. 코팅, 가습, 냉각, and dust-control processes each need a distribution that matches travel distance, airflow, and the desired interaction.

Can air pressure be used to adjust droplet size without changing flow?

Some variable two-fluid designs allow useful independent adjustment of atomizing air and liquid delivery, especially when liquid and fan air are separately controlled. The variables still interact through the cap and fluid properties, so the final setting should be verified rather than assumed.

When is siphon feed preferable to pressure feed?

Siphon feed can simplify low-flow systems and avoid a pressurized liquid vessel. Pressure feed is generally easier to meter and stabilize when reservoir level, viscosity, tubing, or installation height would make siphon pickup inconsistent.

Which Jeltecn series is the best starting point for automatic coating?

The A100 is a compact option for automatic painting and remote pneumatic control. The DK series is the stronger starting point when the process needs independent atomizing and shaping-air adjustment, liquid recirculation, or more setup flexibility. The liquid and line conditions decide the final model.

What is the most important test before buying multiple nozzles?

Test the selected model at the intended liquid condition, flow, pressure at the nozzle, mounting distance, and airflow environment. Measure the process outcome—coverage, deposited mass, evaporation, 냉각, or dust capture—rather than accepting visible fog as the only result.

Sources and technical scope

This guide uses Jeltecn’s current product pages for series-level configurations and published selection data. General air-atomization principles were checked against the Spraying Systems Co. air atomizing nozzle reference. The distinction between compressed-air acoustic devices and electrically driven piezoelectric systems was checked against Sono-Tek’s ultrasonic atomization explanation and its ASME conference paper on ultrasonic spray characteristics.

Product-page values are not interchangeable across nozzle architectures or fluids. Final selection requires the model-specific data sheet and, where the process is sensitive, an application test. For a basic definition of two-fluid spraying, see Jeltecn’s existing article, What Is an Air Atomizing Nozzle?, or browse the complete air atomizing nozzle range.