Viscosity and density are measured at low temperatures for three methanol/water mixtures. Viscosity is determined by a modified falling cylinder method or a calibrated viscometer. Density is determined by the volume of each mixture contained in a calibrated glass cell placed in a constant-temperature bath

Austin, J. G.

Kurata, F.

Swift, G. W.

English

NASA Technical Reports Server

August 1968
	 Brief 68-10274 
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Viscosity and Density of Methanol/Water Mixtures at Low Temperatures 
Viscosity and Density of Three Methanol/Water 
Mixtures at Various Temperatures (°K) 
Mixture 1 Mixture 2 Mixture 3 
Temperature Viscosity Density Viscosity Density Viscosity Density 
283.16 1.64 0.8553 1.75 0.8623 1.52 0.8466 
273.16 2.07 -- -- -- -- --
258.16 3.06 0.8759 3.38 0.8821 2.75 0.8671 
253.16 3.53 -- -- -- -- --
233.16 6.87 0.8954 7.93 0.9014 5.87 0.8874 
213.16 16.4 -- -- -- -- --
208.16 21.3 0.9155 26.5 0.9211 16.9 0.9080 
193.16 55.0 -- -- -- -- --
183.16 127. 0.9364 176. 0.9411 86.8 0.9295 
173.16 359. 0.9456 1	 538. 0.9500 1 229. 0.9390
	
Viscosity and density of three separate methanol/ 	 described in ASTM D 445. Density was determined by 
	
water mixtures were determined over the temperature	 measuring the volume of a weighed amount of each 
	
range from + 10°C (283.16° K) to -100°C (173.160K). 	 mixture contained in a calibrated glass cell placed in a 
	
The data, required for a cooling system using the 	 constant-temperature bath. 
	
methanol/water mixtures, was not available in the 	 The constant temperature bath consisted of an 
	
literature. The measured values for each of the three	 agitated glass Dewar flask with two unsilvered strips 
	
mixtures are given in the table. The respective weight	 to allow visual observation. An 80% methanol/water 
	
percentages of methanol in mixtures I, 2, and 3 were 	 mixture was used as the bath fluid. The bath was 
	
as follows: 79.9, 77.0, and 83.0. Viscosities are given 	 cooled by vaporizing liquid nitrogen in a coil within 
	
in centistokes, and densities are given in grams per	 the bath, and the temperature was controlled by an 
	
milliliter for the indicated temperatures expressed in 	 electrically heated nichrome wire coil. The tempera- 
degrees Kelvin.	 ture control system consisted of a platinum resistance 
	
The mixtures were prepared from analytical grade, 	 thermometer, a Mueller bridge, a dc null detector, a 
	
anhydrous, acetone-free methanol and distilled water.	 dc amplifier, and the nichrome wire heating coil. The 
	
A few of the viscosities (of the 79.9% methanol mix-	 resistance corresponding to the desired temperature 
	
ture) were determined by a modification of the falling 	 was set on the Mueller bridge. The difference between 
	
cylinder method (described in AIChE Journal, Sep-	 the bridge setting and the resistance of the thermom- 
	
tember 1966, pages 932-936); the rest of the viscosity 	 eter represented the deviation in the temperature 
	
measurements were made with a calibrated viscometer 	 from the desired value. This error si gnal was sent to 
An(continued v rl ar) 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights. 
https://ntrs.nasa.gov/search.jsp?R=19680000274 2020-03-12T06:09:31+00:00Z
the null detector which amplified the signal and 
provided the input for the dc amplifier. The dc ampli-
fier output provided the electrical power to the 
nichrome heater. This system permitted the meas-
urement and control of the temperature to within 
0.010C. 
Note: 
Additional details may be obtained from: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B68-10274
Patent status: 
No patent action is contemplated by NASA. 
Source: J. G. Austin 
of Marshall Space Flight Center 
and F. Kurata and G. W. Swift 
of the University of Kansas 
under contract to 
Marshall Space Flight Center 
(MFS-14991) 
Brief 68-10274	 Category 03


Viscosity and density of methanol/water mixtures at low temperatures

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