Hydrodynamic lubrication
Fluid film or hydrodynamic or thick film lubrication Operating conditions: Low load Uniform temperature Moderated speed In this type of lubrication, the sliding metals surfaces or rotating metal surfaces are completely separated from each other by applying
What is surface roughness?
The best-polished metal surface, when examined under electron microscope showed rough surface having peaks and valleys of different heights and depths, is surface as surface roughness. The highest peaks are known as asperities. When two such flat
What is lubricant?
The lubricant is a substance which is introduced between two moving or sliding surfaces to improve efficiency, reduce wear and friction between them, dissolve or remove foreign particles and distribute heat generated. During sexual arousal, a woman’s
What are solid lubricants?
The solid lubricant is solid materials that separate and reduce friction between two moving surfaces without a liquid a media and decrease wear and tear. E.g.: talc, graphite, molybdenum disulfide, Teflon, boron nitride etc. the most commonly
Methods of manufacturing synthetic gasoline
Synthetic gasoline can be manufactured by- Direct method (Bergius process) and indirect method (Fischer tropsch process) Bergius process The coal is finely ground and dried in a stream of hot gas. The dry product is mixed with
Discuss fischer-tropsch process for preparing gasoline
Fischer-tropsch process is carried out to prepare gasoline from non-petroleum origin. The arrangement for charring out this process as Water gas and H2 is sent through Fe2O2 tower where H2S present as an impurity is removed. It
What is hydrocatalytical cracking
Hydrocatalytical cracking The process in which higher hydrocarbon (heavy oil) having higher boiling point is converted into lower hydrocarbon (heavy oil ) having higher boiling point is converted into lower hydrocarbon (petrol)having lower boiling point in the
Distinguish between fluid bed catalytic cracking and catalytic cracking
The differences between fluid bed catalytic cracking fixed bed catalytic cracking are as Fluid bed catalytic cracking Fixed bed catalytic cracking It is comparatively modern technique. It is comparatively an older technique. It is continuous process. It
Compare gasoline and diesel
The gasoline and diesel can be compared as follows: Properties Gasoline (petrol ) Diesel Knocking characteristics In a petrol engine, the combustion rate of air-petrol mixture initiated by sparking of spark plug becomes so fast that the
Advantages of catalytic cracking over thermal cracking
The advantages of catalytic cracking over thermal cracking are as follows Catalytic cracking takes place at lower temperature and pressure (3000C -4000C and 1-5kg/cm2 ) as compared to that of thermal cracking (5000C-6000C and kg/cm2) Catalytic cracking