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Исследование критической плотности теплового потока при квазистационарном нагреве поверхностно кипящих бинарных смесей

Исследование критической плотности теплового потока при квазистационарном нагреве поверхностно кипящих бинарных смесей

Abstract

The heat-flow rate and temperature of the heater are measured at various liquid subcooling boiling points. An experimental plant and the obtained results on the heat energy motion in the superficially boiling binary liquid mixtures are described. The experiments have used a quasi-stationary heating method which allows accurate specifying of the critical heat flux ( q kr ) and the temperature of the heater ( T h ). An experimental study of the superficial boiling has determined that the critical heat flux density depends significantly on the liquid subcooling. At the liquid nucleus temperature T L =30 0С in the mixture of watern -butanol, 10% critical heat flux reaches a considerable size of 20.68 MW/m 2, and at T L =30 0С much less q kr =2.98 MW/m 2. This is due to the increase in the temperature drop (∆ Т = T h kr + T L ) at the moment of q kr.

Измерены плотность теплового потока и температура нагревателя одновременно при различных недогревах жидкости до точки кипения. В экспериментах применен квазистационарный метод нагрева, благодаря которому можно точно зафиксировать критическую плотность теплового потока ( q кр) и температуру нагревателя ( Т ст). На основании экспериментального изучения поверхностного кипения определено, что критическая плотность теплового потока значительно зависит от недогрева жидкости. При температуре ядра жидкости Т я= 30 0С в смеси водаn -бутанол 10 % критическая плотность теплового потока достигает значительной величины 20,68 МВт/м 2, а при Т я=90 0С в разы меньшей q кр=2,98 МВт/м 2. Это связано с увеличением температурного напора (∆ Т = Т ст кр+ Т я) в момент возникновения q кр.

Keywords

ПОВЕРХНОСТНОЕ КИПЕНИЕ СМЕСЕЙ,КРИТИЧЕСКАЯ ПЛОТНОСТЬ ТЕПЛОВОГО ПОТОКА (Q КР),ТЕМПЕРАТУРНЫЙ НАПОР (∆Т),SUPERFICIAL BOILING OF MIXTURES,CRITICAL HEAT FLUX (Q KR),TEMPERATURE DROP (∆Т)

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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Average
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