Abstract:An experimental method is de®eloped for determining the internal mass flux through frost with a dendrite structure. The theory and experimental procedures of the measurements using water slightly concentrated with deuterium are described. The internal mass flux determined from ®ariations in the deuterium concentration in frost with time shows an almost linear decrease in the frost depth direction from the surface. The profile of the local frost density is almost flat in the depth direction. The frost uniformit… Show more
“…Initial porosity seems to have close relation with the characteristic of the ice crystal growth. Fukuda and Inoue [6] and Miller and Young [22] found that the sublimation density of ice crystal increases as the crystal formation temperatures increase. Moreover, according to the S ßahinÕs results [7], the initial value of the volumetric ratio of the ice columns in the frost layer is a function of environmental parameters.…”
Section: Resultsmentioning
confidence: 98%
“…Both of them reduce the mass diffusivity of the water-vapor and affect the growth of the frost layer. Fukada and Inoue [6] suggested that the water-vapor in the frost layer is supersaturated in their experimental research. Epstein and Rosner [23] concluded that the vapor being transported across the thermal boundary layer is observed to undergo homogeneous nucleation to the liquid phase, and vapor pressure is larger than saturated value.…”
Section: Resultsmentioning
confidence: 99%
“…Studies agree that frost has a flat density profile in the y direction [6,12], and this means that does not vary in the y direction and the porosity of the frost layer is uniform in the frost layer. The second term of Eq.…”
Section: Water-vapor Concentration In the Frost Layermentioning
confidence: 98%
“…They used correction factors to match the experimental data. Fukada and Inoue [6] developed an experimental method for determining the internal mass flux through frost layer and found that the profile of the local frost density is almost flat in the direction of depth, regardless of the cooling wall temperature and the total pressure. S ßahin [7] found that the effective thermal conductivity of the frost layer was not the only parameter related to frost density.…”
“…Initial porosity seems to have close relation with the characteristic of the ice crystal growth. Fukuda and Inoue [6] and Miller and Young [22] found that the sublimation density of ice crystal increases as the crystal formation temperatures increase. Moreover, according to the S ßahinÕs results [7], the initial value of the volumetric ratio of the ice columns in the frost layer is a function of environmental parameters.…”
Section: Resultsmentioning
confidence: 98%
“…Both of them reduce the mass diffusivity of the water-vapor and affect the growth of the frost layer. Fukada and Inoue [6] suggested that the water-vapor in the frost layer is supersaturated in their experimental research. Epstein and Rosner [23] concluded that the vapor being transported across the thermal boundary layer is observed to undergo homogeneous nucleation to the liquid phase, and vapor pressure is larger than saturated value.…”
Section: Resultsmentioning
confidence: 99%
“…Studies agree that frost has a flat density profile in the y direction [6,12], and this means that does not vary in the y direction and the porosity of the frost layer is uniform in the frost layer. The second term of Eq.…”
Section: Water-vapor Concentration In the Frost Layermentioning
confidence: 98%
“…They used correction factors to match the experimental data. Fukada and Inoue [6] developed an experimental method for determining the internal mass flux through frost layer and found that the profile of the local frost density is almost flat in the direction of depth, regardless of the cooling wall temperature and the total pressure. S ßahin [7] found that the effective thermal conductivity of the frost layer was not the only parameter related to frost density.…”
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