![]() ![]() So, we highly recommend giving our Combo package a try to enhance your knowledge on the subject. Watching the videos will help you grasp the topic better and make learning more enjoyable. This package covers all the important details and presents them in an easy-to-understand format. It’s a great way to dive deeper into the subject through video explanations. If you want to learn more about this topic, we suggest checking out our Combo package with the given link . We want a higher viscosity index in lube oils because a good quality lube oil should not change its viscosity w.r.t change in temperature and a lower viscosity index in fuel oils because we want the viscosity to change w.r.t change with temperature. For liquids such as water, viscosity can be perceived as a measure of the liquid’s resistance to flow. Viscosity is a measure of the resistance of a fluid to deformation at a given rate. Lower viscosity index: more viscosity is affected with a change in temperature Higher viscosity index: less viscosity is affected with a change in temperature. The viscosity of water at a temperature of 20 degrees Celsius is approximately 0.01 poise or 10 -3 Pa.s (Pascal seconds). It is the change in viscosity relative to temperature change. It can be measured by a device called a viscometer.ĭiagrams: Capillary type viscometer Falling ball-type viscometer Rotary type viscometer What is the Viscosity index? So viscosity is important in looking at how much is the clearance, if clearance is less, then we need less viscous lube oil otherwise it will not enter the between two surface clearances. We need to lubricate it so that it does not create friction and get wear and tear. ![]() When we have two metals, one is stationary and the other is moving up and down, the clearance between both metals is very less. So when fuel is heated, its viscosity reduces and proper injection takes place. It is very thick at 30° C so for burning it, we heat it to 130° C so that it can have a viscosity of 13 cst, the fuel we get on the ship has actual viscosity of 380 cst which is very thick at 50☌. The quality of fuel on the ship is third-grade quality. Viscosity ∝ 1/Temp (for liquid) Why is viscosity important onboard a ship? index showing the percentage of moisture in the air, etc. Example: honey when in very cold temp like 15° C is very thick and will not flow easily, raise it to 45° C then the flow will increase and at 80° C it will flow like water. A type of rheometer that measures the viscosity of flour as it is mixed with water. Increasing the temperature of a substance decreases its viscosity which increases flow. All heavy oils and lube oils used on the ship are denoted by viscosity in cst at 50 ☌ Viscosity and its relation with temperature: ![]()
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