PREDICTION OF FINAL TEMPERATURE FOLLOWING JOULE-THOMSON EXPANSION OF NITROGEN GAS

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Title:	PREDICTION OF FINAL TEMPERATURE FOLLOWING JOULE-THOMSON EXPANSION OF NITROGEN GAS
Authors:	CHOU,FC;WU,SM;PAI,CF
Contributors:	機械工程學系
Keywords:	STATE;EQUATION
Date:	1993
Issue Date:	2010-06-29 18:08:23 (UTC+8)
Publisher:	中央大學
Abstract:	This paper shows a theoretical prediction of the final temperature T(a) which can be obtained using the Joule-Thomson (J-T) effect by expanding nitrogen gas across a throttling valve to 0.101 M Pa. An iteration method using the J-T coefficient mu is first used to predict T(a). The Benedict-Webb-Rubin (BWR) and Redlich-Kwong (RK) equations are used to determine the specific volume and the derivatives of properties, respectively. Values of T(a) can be well predicted by a five-step expansion simulation, except for cases where the isenthalpic lines to 0.101 MPa cross a region around T = 120-160 K and P = 6.0 MPa. In this region, calculated mu are lower than the experimental data. By equalizing the value of enthalpy after expansion to that before expansion and using the Peng-Robinson (PR) equation to calculate the departure function, the values of T(a) can also be well predicted by the second method, except for P(b) > 3.5 MPa in the cases where T(b) = 170 and 150 K.
Relation:	CRYOGENICS
Appears in Collections:	[Graduate Institute of Mechanical Engineering] journal & Dissertation

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