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Heat Transfer Research
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ISSN Imprimir: 1064-2285
ISSN En Línea: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v32.i4-6.80
9 pages

Anomalous Behavior of Heat Transfer in Film Boiling of Liquid Nitrogen in Tubes at Large Subcoolings and Mass Flow Velocities

V. P. Firsov
Moscow Aviation Institute (Technical University), Moscow, Russia
I. V. Artyukhov
Moscow State Aviation Institute (Technical University), Russia

SINOPSIS

We present the results of an experimental investigation of liquid nitrogen film boiling in vertical tubes of 9.7 mm and 20 mm in diameter. The experiments were conducted under the conditions of nonstationary cooling of a pipeline within the range of the flow mass velocities from 500 to 15000 kg·m3/sec, pressure from 5 to 20 bar, nondimensional subcooling of liquid from 0.05 to 0.6, wall temperature from 200 to 900 K. It is shown that under the conditions of large subcoolings of liquid a slug regime of motion of a liquid-vapor flow is realized and the existence of two basic regimes of heat transfer is possible: self-similar and non-self-similar relative to the heat removing surface temperature.


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