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Condensation of refrigerant R404A under external disturbances

Bohdal T., Łomiak M.

Archives of Thermodynamics

2009

Vol. 30, no. 2

37-57

The paper describes results of experimental investigations of condensation of the refrigerant R404A in the flow through a coiled tube under conditions of external disturbances that occur in refrigeration units. The development and decay of condensation is induced by impulse changes of parameters of the two-phase system, such as pressure and mass flux density in the tubular channel. It is confirmed that the two-phase systems exhibit wave properties and that the disturbances propagate with finite velocities. Experiment-based correlations are obtained to describe the propagation of disturbances during development and decay of condensation of the refrigeration medium in the tubular channel.

Wave character of onset of boiling in an annular clearance

Bilicki Z., Bohdal T.

Archives of Thermodynamics

2002

Vol. 23, no 3

91-104

The paper describes results of experimental investigations of the developmentof bubbly boiling in a vertical annular clearance. The process of boiling is driven by increasing the heat flux density at the heated wall. It is found that the phenomenon is of a wave character, and the relative propagation velocity of the boiling front is proportional to the heat flux density. An experiment-based correlation to describe the boiling process is also elaborated.