SIMPLIFIED DEWPOINT PREDICTIONS FOR<i>N</i>-TRACE SALT-CONTAINING NON-IDEAL CONDENSATES IN HIGH TEMPERATURE REACTIVE VAPOR ENVIRONMENTS

Roy, Ratul; Liang, Baishen; Rosner, Daniel E.

doi:10.1080/00986448808940007

Chemical Engineering Communications

1988

DOI: 10.1080/00986448808940007

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SIMPLIFIED DEWPOINT PREDICTIONS FORN-TRACE SALT-CONTAINING NON-IDEAL CONDENSATES IN HIGH TEMPERATURE REACTIVE VAPOR ENVIRONMENTS

Ratul Roy

Baishen Liang

Daniel E. Rosner

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1989

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Cited by 4 publications

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“…t Indeed, from the viewpoint of 'hot corrosion', multicomponent miscible salts will broaden the dangerous temperature interval between the condensate (solution) freezing point and the higher multicomponent dew-point (see, e.g Liang and Rosner, 1987;Roy, Liang and Rosner, 1988;. Rosner and Nagarajan, 1987a; and Stearns e 01., 1983).…”

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Experimental Studies of Nucleation Phenomena Within Thermal Boundary Layers—influence on Chemical Vapor Deposition Rate Processes

Liang

Gomez

Castillo

et al. 1989

Chemical Engineering Communications

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In carrying out partial vapor condensations using actively cooled surfaces it is known that 'mist' formation can occur within thermal boundary layers (Rosner and Epstein, 1968), dramatically modifying total deposition fluxes. Using a combination of flash-evaporation (Rosner and Liang, 1986) and laser probing techniques, we report new experimental results on binary alkali salt (K 2SO. + Na,SO.) deposition from combustion gases showing that the deposition rate of potassium sulfate first increases with the addition of sodium sulfate until the concentration of Na2S0. reaches a (target surface temperature dependent) 'threshold' value. Further increases in the concentration of Na2S0. dramatically decrease the total deposition rate of K 2SO .., implying that potassium sulfate-containing microdroplets are formed within the thermal boundary layer, which, despite their thermophoretic drilt toward the target, are not collected as effectively as the 'parent' K 2SO.-vapor species. Laser light scattering measurements clearly reveal that suspended particles exist near the deposition surface under these conditions, OUf experimental results on mass transfer rate and light scattering are consistent with those predicted using laminar boundar)' layer theory (Castillo and Rosner, 1989b) coupling both binary salt vapor deposition with particle vapor scavenging and deposition. Comparisons of our observed mist onset conditions (implying critical supersaturations near unity) with those expected using homogeneous nucleation theory suggest that the binary alkali sulfate mist nucleation mechanism is, instead, heterogeneous, even in our relatively 'clean' combustion products. Because of the well-known vapor pressure reduction phenomenon associated here with the formation of non-ideal solutions, binary systems are shown to provide convenient 'vehicles' to investigate BL mist formatio n onset conditions and CVD-rate consequences without requiring the more extreme surface coolings characteristic of unary condensible vapor systems. An understanding of this dramatic phenomenon, obtained via such laboratory experiments and calculations, will allow its inclusion in future deposition rate calculations of engineering importance.

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confidence: 99%

Experimental Studies of Nucleation Phenomena Within Thermal Boundary Layers—influence on Chemical Vapor Deposition Rate Processes

Liang

Gomez

Castillo

et al. 1989

Chemical Engineering Communications

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Theory of surface deposition from a binary dilute vapor-containing stream, allowing for equilibrium condensation within the laminar boundary layer

Castillo¹,

Rosner²

1989

International Journal of Multiphase Flow

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Soret-‘shifted’ dew-point temperatures for surfaces exposed to hydrocarbon vapors dilute in compressed nitrogen

Rosner

Arias‐Zugasti

2007

Chemical Engineering Science

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SIMPLIFIED DEWPOINT PREDICTIONS FORN-TRACE SALT-CONTAINING NON-IDEAL CONDENSATES IN HIGH TEMPERATURE REACTIVE VAPOR ENVIRONMENTS

Cited by 4 publications

References 3 publications

Experimental Studies of Nucleation Phenomena Within Thermal Boundary Layers—influence on Chemical Vapor Deposition Rate Processes

Experimental Studies of Nucleation Phenomena Within Thermal Boundary Layers—influence on Chemical Vapor Deposition Rate Processes

Theory of surface deposition from a binary dilute vapor-containing stream, allowing for equilibrium condensation within the laminar boundary layer

Soret-‘shifted’ dew-point temperatures for surfaces exposed to hydrocarbon vapors dilute in compressed nitrogen

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