Pages:

194 - 199

Language:

RU

Ref.:

8

Download paper: [RU]

2012_2(10)_35.pdf

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 -∆T_sub = (-0,7 ÷ -13,8) K. At critical flow the rejection of distribution of wall temperature of a experimental tube T_w(l) from not critical flow - on particular length ∆l from exit section of a experimental tube there was a fracture on distribution T_w(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) ~ ∆T_sub . 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.