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Metamaterials with negative compressibility – a novel concept with a long history

100%

Imre A. R.

Materials Science Poland

2014

tom Vol. 32, No. 2

126--129

Metamaterials with negative compressibility are a very promising group of novel materials with a wide variety of potential application. A recent model proposed construction of the structures with three-dimensional negative compressibility by utilizing successive destabilization of stable or metastable states and inducing phase transitions mimicking negative compressibility. Here, we would like to show that similar concept is used by the nature and a nice example of this kind of metamaterial can be seen even in a glass of water.

Numerical analysis of the onset of condensation in the IMP PAN nozzle for cases without the appearance of shock waves in the steam ﬂow

75%

Kornet S. , Banaszkiewicz M. , Badur J.

tom nr 138

107--123

The present paper focuses on the prediction of the spontaneous condensation phenomena in the wet steam ﬂow depending on the inlet temperature. The basic tests including comparison with experimental data have been performed using the planar symmetrical nozzle with the de Laval geometry (IMP PAN nozzle). It was assumed in calculations that steam is pure and does not contain heterogeneous sources of condensation. Numerical analysis was performed for boundary conditions which correspond to the ﬂow regime without the shock wave. The present work includes simulations results of the onset of condensation and shows whether initiation of phase transition is located in the region between a spinodal and a binodal. Numerical results along the nozzle axis are presented on thermodynamic diagrams for all considered ﬂow conditions.