Authors: M. Singh, S. Bhanumati, S.S. Shukla, A. Shukla
Affilation: University of Delhi, India
Pages: 435 - 438
Keywords: viscosity, surfact tension, oil, lubricant, paint, polish, food, beverage, cosmetic, biosolvents, pharma, polymer, nanomaterials
Viscosity is a measure of stickiness and the reverse is fluidity. It is a valuable data for all liquids in the oil, lubricant, paint, polish, food, beverage, cosmetic, biosolvents, drugs and pharma, polymer, nanomaterials, and thousands of other industries. Real life fluids- blood, plasma, serum, proteins, electrolytes, emulsions, gel-sols, colloids and several alikes are better understood and assessed using the viscosity data. The viscosity of blood is around 0.0027 N-s/m2 at 37 deg celsius and the flow rate is proportional to 4th power of the radius of the vessel “r” hence a small decrease in “r” can produce a significant change in the blood flow. If “r” becomes half then the blood flow rate will decrease by 16 times.—hence the worry about cholesterol affecting the heart efficiency is fully justified. Viscosity data is therefore extremely valuable. Similarly, engine oil is much less viscous at higher temperatures. This correlates to the fuel consumption in the automobiles. Liquid surface responds in a way similar to a stretched membrane. Larger the surface area,greater is the energy. To minimize the energy smaller surface area is assumed by liquids in the form of drops. The term Surface Tension (the force F per unit length L which tends to pull the surface back to minimum energy) is given as, ST=F/L. Soaps and detergents lower the ST of water. Substances with low ST tend to form films. The Survismeter measures surface tension and viscosity with 0.734% and 0.8903% reproducibility respectively. With one time loading, multiple parameters can be determined. Sucking of the liquid is avoided because a piston does the job-averting any health hazard Being cost effective, energy saving and health protecting device, the Survismeter is best suited for academic, research and development labs, industries, pharmacies, medical, engineering ,hydrodynamic studies, automobile, aviation, civil environmental, municipal wastewater treatment and endless management fields.