Abstract
The presented paper focuses on the comparison of the two effervescent atomizer configurations—the outside-in-gas (OIG) and the outside-in-liquid (OIL). The comparison was based on the spray pulsation assessment by different methods. The atomizers were tested under the same operating conditions given by the constant injection pressure (0.14 MPa) and the gas to the liquid mass ratio (GLR) varying from 2.5 to 5%. The aqueous maltodextrin solution was used as the working liquid (μ = 60 and 146 mPa·s). We found that the time-averaging method does not provide sufficient spray quality description. Based on the cumulative distribution function (CDF) we found that the OIG atomizer generated the spray with non-uniform droplet size distribution at all investigated GLRs. Exceptionally large droplets were present even in the spray which appeared stable when was analyzed by the time-averaging method.
Highlights
Twin-fluid atomizers are widely used, as an alternative to pressure nozzles, for spraying of viscous liquids
The simplest, but only qualitative, insight into the temporal spray behavior provide the records of the timedependent droplet sizes in Fig. 3, 4
These figures show the comparison of the two atomizers at the same gas to the liquid mass ratio (GLR) and inlet pressure (Fig. 3) and the GLR atomizer working at two different gas consumption regimes (Fig. 4)
Summary
Twin-fluid atomizers are widely used, as an alternative to pressure nozzles, for spraying of viscous liquids. A number of internal mixing atomizer designs have been proposed and studied in detail in past decades [6], [9], [3] Though these works provide sufficient amount of information about particular atomizer designs and their spray properties, there is a lack of their systematic comparison and applicability analysis [1]. We will analyze the measured timedependent droplet sizes to judge the spray quality This analysis will be further used to compare the OIL and OIG atomizers and their applicability potential. The only difference of the OIG and the OIL atomizers is that the liquid and the gas injection ports are switched Even when this slight change may seem unimportant. As we previously observed [6], the internal flow of the OIG atomizer tends to develop as the plug or slug flow, while the liquid in the OIL atomizer tends to attach on the wall of the mixing chamber, which leads to the annular structure of the internal flow
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