SMD is diameter of a single drop which, has "area/volume ratio" equal to "total area/total volume Main parameters of droplet size distributionĪ value that 10% of total volume or mass of sprayed liquid has diameters smaller or equal to thisĪ value that 90% of total volume or mass of sprayed liquid has diameters smaller or equal to this Power Analyzer (Lutron 801) was used for measuring of consumption Flow was peripherally flowed to center of wheel through the liquid distributer, and was measured by a flow-meter (range of 10 to 100 l/h). In rotary atomizer: wheel speed was controlled by a speed controller and measuredīy a tachometer (Prova RM-1501). Wheel has 50 mm diameter and 8 mm outlet thickness and has 11 semi conical pins were located peripherally. otary atomizer contain a wheel that mounted on a motor (710 watt modelĭewalt rotor, 120 V, 11 amps, 27,000 rpm), a feeding system and atomizer drive case. Schematic of rotary atomizer test apparatus It is includes: power analyzer, rotary atomizer, analyzer of PDA, signal processorįig. Power of rotary atomizer with pin-wheel for water is studied.Įxperimental test were conducted by rotary atomizer test apparatus that is shown in Figureġ. In this study droplets size characteristics and consumed Therefore, to begin demonstrating droplets distributionĬharacteristic in rotary atomizer, this parameters have been studied under various Speed, physical properties of liquid, feed flow rate, and intrinsic properties In general, empirical equations show that droplet size is influenced by atomizer By determining the exact value of consumed power for each feedstock inĪ rotary atomizer it can be possible to figure out the overall costs more exactly. Since rotary atomizers have a great industrialĪpplication there weren't enough data about power consumption along with their The Other important factor for evaluating rotary atomizers in economical aspect is Way to use PDA for characterization spray from rotary wheel atomizer were described PDA techniques for the characterization of swirl atomizers. Also, spray measurements were obtained using the Was employed to observe and monitor the atomization result based on the characteristic PDPA (phase Doppler/ParticleĪnemometry) or PDA are flux sampling instruments. Optical analyzers are typically non-intrusiveĪnd do not influence the spray behavior during testing. There are many droplet size analyzers that most of them use optical methodsįor measurement of spray characteristic. ![]() Though theįundamental properties of rotary atomizers and their utilization in both industrialĪnd research applications have been studied, each atomizer has its own inherentĬharacteristics which stem from the form of rotating body and its dimensions One obstacle to these studies is intrinsic properties of the atomizer. Processes in spray dryer have extensively been studied. ![]() Of both droplet linear velocities and shearing forces. It is unique in that it permits the simulation ![]() That the droplet sizes of liquid can be easily controlled by simply adjusting The rotary atomizer provides versatility in There is an extensive range of atomizers utilizedįor spray formation in industry, and the advantages and disadvantages of each One the most important operating variablesĪre atomizer characteristics. Quality of dried powder is affected by liquid specificationsĪnd operating spray dryer variables. In spray dryers a liquid or suspension is atomized by an atomizer and the dropletsĪre dried out by hot gas. Spray drying, power consumption, PDA, spray characteristic. With increasing the atomizer speed and feed flow-rate, obviously power consumption increased. Also, at constant feed flow rate, by increasing atomizer speed, all spray characteristic of D v0.1, D v0.9, VMD and SMD decreased. At constant atomizer speed, by increasing feed flow rate from 20 to 80 l/h, SMD and D v0.1 decreased, VMD unchanged, and D v0.9 increased. Statistical analysis indicated that feed flow rate and atomizer speed, except RSF value, are significant effect on spray characteristics. For different operating condition of rotary atomizer: 7000–26000 rpm disk speed and 20≨0 l/h feed flow rate, the main parameters of spray such as D v0.1, D v0.9, SMD and VDM were measured. Experimental tests were conducted for measuring spray size distribution characteristic and power consumption of a spray dryer rotary atomizer using Phase Doppler Anemometry (PDA).
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