01559naa a22002411i 45000010005000000030009000050050017000140080041000310400021000720410008000930440008001010800010001091000131001192450223002505000021004735200547004946500018010416500028010596500019010876500018011067000124011247730069012485045KOSZ 00520180423105217.0140411s2011    pl     f     |000 0 eng d  cBPKdKOSZ 005/ac  aeng  aPOL  a621.51 aKUCZYŃSKI, Waldemar.d1999 - .bPolitechnika Koszalińska - Wydział Mechaniczny,cKatedra Techniki Cieplnej i Chłodnictwa10aExperimental investigations into the impact of the void fraction on the condensation characteristics of R134a refrigerant in minichannels under conditions of periodic instability /cWaldemar Kuczyński, Henryk Charun.  aDane z autopsji.  aThis paper present the results of experimental investigations of condensation of R134a refrigerant in pipe minichannels with internal diameters 0.64, 0 .90, 1.40, 1.44, 1.92 and 3.30 mm subject to periodic pressure instabilities. It was established that as in conventional channels, the displacement velocity of the pressure instabilities distinctly depends on the frequency of their hydrodynamic generation. The form ofthis relationship depends on the internal diameter of the minichannels and on the method of calculating the void fraction. 0aCondensation. 0aPeriodic instabilities. 0aVoid fraction. 0aMinichannels.1 aCHARUN, Henryk.d1996 - .bPolitechnika Koszalińska - Wydział Mechaniczny,cKatedra Techniki Cieplnej i Chłodnictwa0 iW :tArchives of Thermodynamics. -g2011,Vol. 32, nr 2, s. 21-37