Abstract
The article is devoted to the following issues: boiling of fluid in the cooling jacket of the engine cylinder head; agents that influenced the thermal conductivity coefficient of nanofluids; behavior of nanoparticles and devices with nanoparticles in the engine’s cylinder head cooling system. The permissible temperature level of internal combustion engines is ensured by intensification of heat transfer in cooling systems due to the change of coolants with “light” and “heavy” nanoparticles. It was established that the introduction of “light” nanoparticles of aluminum oxide Al2O3 Al2O3 into the water in a mass concentration of 0.75% led to an increase in its thermal conductivity coefficient by 60% compared to the base fluid at a coolant temperature of 90 °C, which corresponds to the operating temperature of the engine cooling systems. At the indicated temperature, the base fluid has a thermal conductivity coefficient of 0.545 Wm2×°C W/(m °C), for nanofluid with Al2O3 particles its value was 0.872 Wm2×°C. At the same time, a positive change in the parameters of the nanofluid in the engine cooling system was noted: the average movement speed increased from 0.2 to 2.0 m/s; the average temperature is in the range of 60–90 °C; heat flux density 2 × 102–2 × 106 Wm2; heat transfer coefficient 150–1000 Wm2×°C. Growth of the thermal conductivity coefficient of the cooling nanofluid was achieved. This increase is determined by the change in the mass concentration of aluminum oxide nanoparticles in the base fluid. This will make it possible to create coolants with such thermophysical characteristics that are required to ensure intensive heat transfer in cooling systems of engines with various capacities.
Highlights
The problems of modern piston engine depend on increasing the power and motor resource of the engine; the qualitative composition of combustible mixtures and ensuring multilayerness, taking into account toxicity and harmful emissions; starting systems and fuel injection; limiting mechanical and thermal tension
The main questions addressed in the article are the following: factors influencing the thermal conductivity coefficient of nanofluids; boiling of liquid in the cooling jacket of the engine cylinder head; behavior of nanoparticles and devices with nanoparticles in the engine cylinder head cooling system; the discussion of the results [117–184], taking into account degradation of modern structural materials under the hydrogen containing environment influence [2,24,32,43–51,63,118,175,176]
The results of theoretical and experimental studies of nanofluids and devices made of nanoparticles of various weights in the cylinder head cooling system allow us to state the following:
Summary
The problems of modern piston engine depend on increasing the power and motor resource of the engine; the qualitative composition of combustible mixtures and ensuring multilayerness, taking into account toxicity and harmful emissions; starting systems (for diesel engines) and fuel injection; limiting mechanical and thermal tension. Work is underway to improve the characteristics of internal combustion engines and their. Systems: fuel supply, combustion, lubrication, air supply, and cooling. For example, when assessing the heat balance of ship engines, the effective power interval varies from 31.0 to 41.8%, and the losses in the coolant are from 10.5 to 22.9%
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
