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Title: Viscosity measurements of ammonia, R32, and R134a. Vapor buoyancy and radial acceleration in capillary viscometers

Abstract

The saturated liquid viscosity of ammonia (NH{sub 3}) and of the hydrofluorocarbons, difluoromethane (CH{sub 2}F{sub 2}, R32) and 1,1,1,2-tetrafluoroethane (CF{sub 3}-CH{sub 2}F, R134a), was measured in a sealed gravitational viscometer with a straight vertical capillary. The combined temperature range was from 250 to 350 K. The estimated uncertainty of the ammonia measurements if {+-}3.3 and {+-}2 to 24% for the hydrofluorocarbons with a coverage factor of two. The results are compared with literature data which have been measured with capillary viscometers of different design. Agreement within the combined experimental uncertainty is achieved when some of the literature data sets are corrected for the vapor buoyancy effect and when a revised radial acceleration correction is applies to data which were obtained in viscometers with coiled capillaries. An improved correction for the radial acceleration is proposed. It is necessary to extend international viscometry standards to sealed gravitational capillary instruments because the apparent inconsistencies between refrigerant viscosity data from different laboratories cannot be explained by contaminated samples.

Authors:
; ; ;  [1]
  1. National Inst. of Standards and Technology, Boulder, CO (United States). Physical and Chemical Properties Div.
Publication Date:
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
696843
Resource Type:
Journal Article
Journal Name:
International Journal of Thermophysics
Additional Journal Information:
Journal Volume: 20; Journal Issue: 2; Other Information: PBD: Mar 1999
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; AMMONIA; MATERIAL SUBSTITUTION; REFRIGERANTS; VISCOSITY; FLUORINATED ALIPHATIC HYDROCARBONS; VISCOSIMETERS; TEMPERATURE RANGE 0273-0400 K; COMPARATIVE EVALUATIONS; DATA COVARIANCES

Citation Formats

Laesecke, A, Lueddecke, T O.D., Hafer, R F, and Morris, D J. Viscosity measurements of ammonia, R32, and R134a. Vapor buoyancy and radial acceleration in capillary viscometers. United States: N. p., 1999. Web. doi:10.1023/A:1022644718603.
Laesecke, A, Lueddecke, T O.D., Hafer, R F, & Morris, D J. Viscosity measurements of ammonia, R32, and R134a. Vapor buoyancy and radial acceleration in capillary viscometers. United States. https://doi.org/10.1023/A:1022644718603
Laesecke, A, Lueddecke, T O.D., Hafer, R F, and Morris, D J. 1999. "Viscosity measurements of ammonia, R32, and R134a. Vapor buoyancy and radial acceleration in capillary viscometers". United States. https://doi.org/10.1023/A:1022644718603.
@article{osti_696843,
title = {Viscosity measurements of ammonia, R32, and R134a. Vapor buoyancy and radial acceleration in capillary viscometers},
author = {Laesecke, A and Lueddecke, T O.D. and Hafer, R F and Morris, D J},
abstractNote = {The saturated liquid viscosity of ammonia (NH{sub 3}) and of the hydrofluorocarbons, difluoromethane (CH{sub 2}F{sub 2}, R32) and 1,1,1,2-tetrafluoroethane (CF{sub 3}-CH{sub 2}F, R134a), was measured in a sealed gravitational viscometer with a straight vertical capillary. The combined temperature range was from 250 to 350 K. The estimated uncertainty of the ammonia measurements if {+-}3.3 and {+-}2 to 24% for the hydrofluorocarbons with a coverage factor of two. The results are compared with literature data which have been measured with capillary viscometers of different design. Agreement within the combined experimental uncertainty is achieved when some of the literature data sets are corrected for the vapor buoyancy effect and when a revised radial acceleration correction is applies to data which were obtained in viscometers with coiled capillaries. An improved correction for the radial acceleration is proposed. It is necessary to extend international viscometry standards to sealed gravitational capillary instruments because the apparent inconsistencies between refrigerant viscosity data from different laboratories cannot be explained by contaminated samples.},
doi = {10.1023/A:1022644718603},
url = {https://www.osti.gov/biblio/696843}, journal = {International Journal of Thermophysics},
number = 2,
volume = 20,
place = {United States},
year = {Mon Mar 01 00:00:00 EST 1999},
month = {Mon Mar 01 00:00:00 EST 1999}
}