variavel0=<b>Epifanio M. Ticona</b> - emt@mec.puc-rio.br PUC-RIO
<b>José Alberto R. Parise</b> - parise@mec.puc-rio.br PUC-RIO
<b>Abstract.</b> Modelling of flow through short tube orifices, expansion devices used mainly in air conditioning units, has been predominantly of the semi-empirical type. The limitations of such models are obvious, with their application restricted to the the refrigerant tested, geometry studied and the range of experimental flow conditions. Surprisingly, theoretical models are still scarce in the literature. Moreover, one of the very few of these models still relies on experimental data (exit pressure) for its completeness. The present work describes a fully theoretical model for flow trough short tube orifices. Flow predictions are compared with experimental data showing good agreement.
<b>Keywords.</b> short tube restrictors, modeling.