2012 2(10)

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   Short abstract

 

Pages:

194 - 199

Language:

RU

Ref.:

8


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2012_2(10)_35.pdf

 

 

CRITICAL FLOW OF A LIQUID IN A LONG CHANNEL

Klimenko A.V., Sudarchikov A.M.

National Research University "Moscow Power Engineering Institute", Moscow, Russia


Citation:

Klimenko, A.V. and Sudarchikov, A.M., (2012) Critical flow of a liquid in a long channel, Modern Science: Researches, Ideas, Results, Technologies, Iss. #2(10), PP. 194 - 199.


Keywords:

liquid nitrogen; forced flow; critical flow; long channel


Abstracts:

The experimental investigation of critical flow of subcooling liquid nitrogen in a long adiabatic channel is held. The inlet pressure in a experimental tube in experience change within the range pin = (3,5 ÷ 6,2) 105 Pa, volumetric flow rate of a liquid - V = (0,019 ÷ 0,057) 10-3 m-3/s (mass flow rate - G = (600 ÷ 3150) kg/(m2s)), liquid subcooling -∆Tsub = (-0,7 ÷ -13,8) K. At critical flow the rejection of distribution of wall temperature of a experimental tube Tw(l) from not critical flow - on particular length ∆l from exit section of a experimental tube there was a fracture on distribution Tw(l). After originating critical flow the position of this fracture did not vary in time during all experience under other invariable conditions. Is shown, that relative length (∆l/l) is a weak function of a liquid subcooling (∆l/l) ~ ∆Tsub . Is established, that at critical flow of subcooling liquid nitrogen in a length channel arising in a channel a shock wave ««locks» a channel, saving on his considerable length former not critical values of regime flow parameters.


References:

  1. Сверхпроводники для электроэнергетики. Информационный бюллетень, т. 4, вып. 3, июнь, 2007, с. 1 - 8, http:/perst. isssph.kiae.ru/supercond.

  2. J.Xu, R.Wang. Critical flow with high pressure water flowing in small diameter sharp-edged tubes. Heat and Mass Transfer. 35, 1999, pp. 205 - 211.

  3. Э.Е. Благов. Критическое отношение давлений и критическая скорость при течении однокомпонентной вскипающей жидкости через сужающие устройства. Теплоэнергетика, 2005, № 6, с. 56 - 66.

  4. Nilpueng K., Wongwises S. Choked flow mechanism of HFC-134a flowing through short-tube orifices. Experimental Thermal and Fluid Science, Vol. 35, Iss. 2, 2011, pp. 347-354.

  5. Дейч М.Е., Филиппов Г.А. Газодинамика двухфазных сред. - 2-е изд. 2., перераб. и доп. - М.: Энергоиздат, 1981. - 472 с. ил.

  6. Фисенко В.В. Критические двухфазные потоки. М.: Атомиздат, 1978, 160 с.

  7. Вайсман М.Д. Термодинамика парожидкостных потоков. Изд-во "Энергия", 1967, с. 273.

  8. Клименко А.В., Сударчиков А.М. Экспериментальное исследование гидродинамической неустойчивости кипящего в канале вынужденного потока азота. // Вестник МЭИ. 2001. № 5. С. 47 - 53.

 

 
     

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