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論文
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Amagai, Kenji ; Hashimoto, Hiroyuki
概要:
application/pdf<br />Journal Article<br />Constitutive equations regarding the drift flux model for a multiphase flow consisting of molten material and its solidified particles were thermodynamically derived under a condition of local
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quasiequilibrium. The basic equations, including the conservation equations and the constitutive equations for the multiphase flow, were expressed in dimensionless forms. The theory developed here confirmed that the temperature fields closely depended on the Lagrangian derivative of the solid fraction accompanying the latent heat effect, and was characterized by the Stefan number. It was also suggested that the simplified basic equations corresponding to the phase equilibrium diagram were useful in the analysis of multiphase flow with solid-liquid phase change.
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| 2.
論文 |
論文
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Hashimoto, Hiroyuki ; Amagai, Kenji
概要:
application/pdf<br />Journal Article<br />The conservation equations of mass, momentum and energy for a molten liquid flow of two chemical constituents with their solidified particles were derived by means of the averaging method. The
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drift flux model equations for the fine particles were also derived under a locally homogeneous approximation. The present model suggests that the energy equation should have energy transport terms corresponding to the heat conduction, the migration of particles and the diffusion of chemical constituents. As representative examples, these energy transports were evaluated quantitatively for binary molten salt and liquid alloy under the assumption of a locally thermal equilibrium. The results show that the energy conservation equation for solidified particles and melt flow should include an energy transport term due to particle migration.
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| 3.
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論文
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TABEI, Katsu'ine ; SHIRAI, Hiroyuki ; TAKAKUSAGI, Fumio
概要:
application/pdf<br />Journal Article<br />Using the moire-schlieren method for symmetric and asymmetric flow fields, density distributions of underexpanded free jets of air from circular and square nozzles have been measured.
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Experimental moire image data of the flows, which show integrated light deflection across the flow, were converted to an internal density distribution by the numerical inverting method. The experiment was performed systematically by changing the pressure ratio across the nozzles from 4 to 13. It was found that the density profiles measured in the expanded free jets from a circular nozzle agreed well with other experimental results, and that those for a square nozzle were much more complex than for a circular nozzle. In spite of the large difference in such profiles, the density variations along the flow axis for both nozzles were very similar to each other.
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