Viscosity of Liquids by Dabir S. Viswanath
By Dabir S. Viswanath
This ebook is exclusive in that it brings jointly released viscosity information, experimental equipment, theoretical, correlation and predictive approaches in one quantity. The - readers gets a greater knowing of why numerous tools are used for measuring viscosity of alternative kinds of beverages and why an experimental approach relies on fluid features, similar to Newtonian or non-Newtonian fluids. Undergraduate and graduate scholars in any technological know-how and engineering disciplines will locate this e-book very worthwhile. it truly is an exceptional reference publication for chemical engineers, mechanical engineers, and nutrients engineers. Any researchers linked to chemical synthesis, procedure improvement, fluid circulation, the petroleum undefined, the chemical - or advertisement agencies will profit considerably from this e-book. it's also steered for layout, specialist, and practicing engineers.
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Example text
There are several precautions to be observed in connection with this instrument. The level of the bath liquid must be above the over flow rim of the oil tube and any oil used for test or cleaning should be strained before its use. The oil is heated to the required temperature and some of it poured through the clean tube. The cork is inserted tightly enough to prevent air Viscometers 53 leakage but not to reach the outflow tube. 5oC or 3oF above the temperature of the test and is poured into the oil tube until it ceases to over flow into the over flow cup.
The U–tube must be filled completely at the bottom and should be free from air bubbles and particulate matter. The viscometer is positioned in a thermostat maintained at the required temperature. After desired temperature is attained, a plug is placed over tube 3 and suction is applied to tube 2, until the liquid reaches the center of the bulb C. The suction is disconnected from tube 2, the plug is removed from tube 3 and is immediately placed over tube 2 until sample drops away from the lower end of the capillary.
A. b. c. d. e. f. g. h. 1 Ubbelohde Viscometer Ubbelohde suspended level viscometer11,12, shown schematically in Fig. 3 to 100,000 cSt. A Ubbelohde viscometer possesses the same viscometer constant at all temperatures. This property is advantageous when measurements are to be made at a number of different temperatures. The liquid is induced to flow only down the walls of the bulb below the capillary, thus forming a suspended level, ensuring that the lower liquid level is automatically fixed and coincides with the lower end of the capillary, avoiding the need to fill the viscometer with a definite volume of the liquid and application of corrections for the expansion of glass due to changes in temperature.