In this study, forming of deposits from biodiesel with different variation, that are Diesel (B0) and Biodiesel (B100) will be observed with hot surface plate method to find their characteristics and growth mechanisms, formed through repetitive process of deposition and evaporation that were done to every fuel variation. Growth was observed by using two methods of droplet testing, single droplet test and multi droplet test. This study program was created to finding the optimum temperature in order to control the forming of deposits in combustion chamber. Based on the results shown that Diesel (B0) evaporation time is faster than Biodiesel (B100). The growth of B0 deposit mass is smaller than B100 at temperatures 300°C and 350°C.
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