Evaluation of the conductance of the orifice of the new CNR-IMGC dynamic expander

Abstract

Different methods, based both on analytical considerations and on the Monte Carlo evaluation, were applied to the calculation of the correction factor, K, of the conductance of the orifice of the new Istituto di Metrologia "G. Colonnetti" (CNR-IMGC) dynamic system. The results are compared and the uncertainty with which K is determined is discussed. The data from the McCulloh method and from Monte Carlo simulations are compared. The latter method, while taking into account the conductance of all the geometrical parts, offers the possibility of evaluating the uncertainty without any approximation.