- 學位論文
DEVELOPMENT OF A LOW NOISE HIGH EFFICIENCY CPU WATER COOLING SYSTEM WITH CFD
DEVELOPMENT OF A LOW NOISE HIGH EFFICIENCY CPU WATER COOLING SYSTEM WITH CFD
並列摘要
In this thesis a low noise efficient CPU cooling liquid system is studied with the aid of CFD tools. The CPU liquid cooling emerges as one of the most effective cooling options for the actual high performance devices. The radiator and fan are studied in different arrangements, whilst the finite element package, COMSOL Multiphysics, was used to perform the air flow velocity simulations through the radiator fins for two prime cases: a radiator with a high speed (4000 rpm) fan and with two lower speed (3000 rpm) fans. The simulations’ results showed similar airflow values over the selected radiator fin surfaces differing less of 5% comparatively, therefore a proportional heat transfer is expected, which is a positive result for the proposed configuration of two low speed fans. The noise generated by cooling systems is one of the biggest concerns when designing this CPU cooling solutions, therefore an acoustical analysis was performed and the proposed two 3000 rpm fan system showed 75% less noise generated or quieter than a 4000 rpm fan radiator arrangement. At the same time, numerical simulations were also performed in the active liquid heat sink. Basic assumptions and numerical methods, especially for rotating machinery in fluid dynamics in the numerical simulation, are discussed throughout the simulation. Various impeller curved impeller leaves were investigated, showing that a better performance in flow rate through the water block is achieved with a six curved leaves geometry. The simulation revealed that as the impeller rpm increases, both the velocity and the flow rate increase almost linearly. These obtained results represent an important source of information for the design and optimization of a cooling system.