Determine viscosity of given sample of fuel oil at different temperature.

Determine viscosity of given sample of fuel oil at different temperature.

APPARATUS: - 

Red-Wood Viscometer, Thermometer and Sample.

VISCOSITY:-

The physical property is a measure of the resistance of a fluid to streamline flow.

The instrument consists of a Cylindrical Brass vessel [The oil cup A], thickly plated internally having a thick metal bottom, slightly concave on the inside surface centre of which the gate jet J is fixed. A pointed stub B is fixed to the side of the vessel determines the head of the oil. A small Brass Spherical plug is fixed to a wire V, both heavily Silver plated when resting in the vertical middle cavity in the gate jet closes the orifice, when raised. So as to open the orifice as per need, it is suspended by small hook from a mechanism R. All above is fixed by means of a screw thread of the Brazed Copper Vessel C, which is finished with the tap D, and a Copper heating tube E.

Projecting at an angle of 45° from the side, this is closed to the bottom. This vessel contains water or oil in A is maintained constant and is provided with a stirring apparatus consisting of four light metal vanes fixed to a thin Copper tube which revolves smoothly round the cylinder A, the tube having a broad curved flange at the top to prevent any of the light in C, from being splashed in the oil A. The stirrer is rotated to and for by mean for the thermometer T, which resist the temperature of the fluid both another thermometer. It is held by a spring clamps, which slides on rod R, which is immersed in the oil under going test. A Brass cover is also provide to fit cover the top of the oil cup.

METHOD OF EXPERIMENT:-

The interior of air cup A and orifice of the jet are first inspected. They must be perfectly clean, dry and free from any loose particles, which might obstruct the free flow of oil. In examining the jet, a small mirror held below is useful. After inspection the instrument is levelled.

The outer vessel C is then filled with water and brought to the required temperature (60 °F). Then oil is poured in to the oil cup A to the gauge mark B and temperature. It ad jested to that required by regulating the temperature of surrounding. Both the temperature meter dipping in to the oil cylinder is generally use as a stirrer.

When the oil and the surrounding water both comes at the required temperature, the plug is fitted and simultaneously stop water started to flow and time in seconds noted for 50 or 50 to flow in to a graduated receiving flash. The water must be brought to a few degrees above the temperature at which the test is to be made.

The oil should be brought to nearly the required temperature before being poured in to the viscometer because the adjustment afterwards takes place slowly.