A Study on the Flow Resistance of Fluids Flowing in the Engine Oil-Cooler Chosen

Abstract

Oil-coolers are necessary components in high performance diesel engines. The heat removed by the cooler is a component in the total heat rejection via the engine coolant. Oil-cooler absorbs the heat rejected during the piston cooling and engine rubbing friction power loss. During flows of both coolant and engine oil via the oil-cooler, some flow resistances occur. The aim of the study is to determine values of the flow resistance coefficient for oil going through the cooler at various temperatures. The test stand was developed to determine time needed to empty tanks from liquids flowing through oil-cooler. The flow model was elaborated to study the mentioned flow resistance coefficient with respect to changing liquid temperature. The 20 °C increase in liquid temperature resulted in a flow resistance coefficient decrease of 30% for coolant and of the much more for engine oil. It was found that better results would be achieved with flows forced by means of pumps instead of using gravitational forces on the test stand.

Enhancement of Heat Dissipation from the Hydraulic System Using a Finned Adaptive Heat Exchanger

“…These functions include, in addition to heat dissipation, the reduction of friction, wear, detergency, sealing of critical areas, ability to separate water, and many other functions essential for proper engine operation [9]. There are currently two basic methods of cooling oil coolers that allow the accumulated heat energy to be dissipated into a secondary medium, usually air or liquid [10,11]. Air-cooled systems dissipate heat through the air flow.…”