Frost Deposition on Cooled Surfaces under Reduced Pressure.

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 uniformity is kept independent of the cooled-plate temperature and the total pressure in the container unless part of the frost melts. The cause for the uniformity of frost density is discussed in terms of the frost temperature profile and microscopic crystal growth.

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Internal mass flux through frost

Fukada

Inoue

1999

AIChE Journal

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Heat transfer bibliography—Japanese works 1995

Tanasawa

Nishio

Suzuki

1997

International Journal of Heat and Mass Transfer

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Mist Formation in a Water Vapor Cold Trap and Evaluation of Its Removal Rate

Fukada

Fujii

Nishikawa

1998

Journal of Nuclear Science and Technology

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Mist formation conditions in a mixture of non-condensable gas (nitrogen or helium) and water vapor, mass transfer rates onto a cooled wall under the mist formation and choking time are determined in a case of a laminar flow in a vertical round tube cooled from the outside at constant temperatures of 77 K to 263 K. This is a basic study of a cold trap for a fusion fuel clean-up (fcu) system. If mist is formed in the trap, it makes tritium spikes at the trap outlet, and consequently it causes tritium leakage to the outlet. The limiting condition of mist formation in the present system is quantitatively expressed by the critical supersaturation model (CSM). When the inlet vapor concentration is within the CSM mist formation condition, the outlet concentration is very high immediately after the gas supply and, afterward, it drops very quickly. When within the no-mist formation condition, the outlet concentration is almost constant throughout the frosting time. The trap shows a good removal performance for a long time until choking. This difference in the time variations is successfully explained by the relaxation of the mist formation condition with an increase in the thermal resistance of frost formed on cooled surfaces.

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Frost Deposition on Cooled Surfaces under Reduced Pressure.

Cited by 5 publications

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Internal mass flux through frost

Internal mass flux through frost

Heat transfer bibliography—Japanese works 1995

Mist Formation in a Water Vapor Cold Trap and Evaluation of Its Removal Rate

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