A MINI REVIEW ON THE ENGINE DEPOSITS AND ITS EFFECT ON HEAT TRANSFER

Deposit, which is found in the combustion chamber of the internal combustion engines after operating hundred hours, causes many various issues such as reduce in the engine power and performance, reduce in ability of heat transfer, reduce in conduction rate but increase in toxic emissions content. Deposits accumulating in the end gas areas, on exhaust valves, and in cylinders with high oil consumption can be distinguished by comparison of H/C atom ratios, carbon content and inorganic compound content. Differences in deposit composition can be observed between engine families and between driving cycles with the same engine family. Besides, deposit also causes the jam between the motive mechanical parts in engine combustion chamber, even cause the abnormal combustion. The study of deposit formation and structure is necessary in order to find out the method aiming for overcoming the negative influence on the engines. The paper presents a review of deposit, the deposit formation and structure are mentioned by many researches and aggregated in this work. Findings of paper not only enrich the knowledge about the engine deposit but also are potential to carry out an experimental set up in order to estimate, calculate the ability of forming the deposit on a same condition as in the engine combustion chamber.