Tuburi vascozimetrice capilare

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Tuburi pentru determinarea vascozitatii cinematice a lichidelor cu vascozimetrele capilare ubbelohde si cannon-ubbelohde

Cappilary Glass Tubes

Vascozitatea este propietatea fluidelor datorita careia in timpul curgerii iau nastere in interiorul lor tensiuni tangentiale care se opun deplasarii straturilor in miscarea lor,unul fata de altul
Vascozimetre capilare sint formate din tuburi de sticla, unite la la partea inferioara si prevazute cu un rezervor de produs, un rezervor suspendat si un tub capilar asezat sub rezervorul suspendat; fiecare aparat este identificat si caracterizat de o constanta K.

A capillary tube viscometer dispenses with direct pressure measurements by comparing capillary tube flow rates of a fluid whose viscous properties are unknown and a standard Newtonian fluid.
Since only flow rate measurements are needed, the experimental technique involves only time and mass measurements and knowledge of the geometry of the capillary tubes.
Using this instrument, the viscous properties were measured for distilled water and glycerol as examples of Newtonian fluids and for several polymer solutions as examples of power-law fluids.
For distilled water, the measured viscosity agreed with the best value available in the literature within 0.55%.

 
 


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