THE VISCOSITY OF AMMONIA

A new representation of the viscosity of ammonia is presented. The rep resentative equations are based on a set of experimental data selected as a result of a critical assessment of the available information. Th e validity of the representation extends from 196 K to the critical te mperature for both liquid and vapor phases. In the supercritical regio n the temperature range extends to 680 K for pressures at or below amb ient and to 600 K for pressures up to 50 MPa. The accuracy of the repr esentation varies from 0.5% for the viscosity of the dilute gas phase at moderate temperatures to about 5% for the viscosity at high pressur es and temperatures. Tables of the viscosity generated by the correlat ing equation at selected temperatures and pressures and along the satu ration line are presented to provide easy reference as well as for the validation of computer codes. (C) 1995 American Institute of Physics and American Chemical Society.