Laser-Doppler vibrating tube densimeter for measurements at high temperatures and pressures.
A laser-Doppler vibrometer was used to measure the vibration of a vibrating tube densimeter for measuring P-V-T data at high temperatures and pressures. The apparatus developed allowed the control of the residence time of the sample so that decomposition at high temperatures could be minimized. A function generator and piezoelectric crystal was used to excite the U-shaped tube in one of its normal modes of vibration. Densities of methanol-water mixtures are reported for at 673 K and 40 MPa with an uncertainty of 0.009 g/cm3.
Research Center of Supercritical Fluid Technology, Department of Chemical Engineering, Tohoku University, Aoba-ku, Aramaki Aza Aoba 06-06-11-404, Sendai 980-8579, Japan.
Tsutomu
T
Aida
Ai
A
Yamazaki
Makoto
M
Akutsu
Takumi
T
Ono
Akihiro
A
Kanno
Taka-aki
TA
Hoshina
Masaki
M
Ota
Masaru
M
Watanabe
Yoshiyuki
Y
Sato
Richard L
RL
Smith
Hiroshi
H
Inomata