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Normally, the open water channel is used to analyze the fluid dynamics when fluid flow through the model. The design convergent section approach is consider in order to determine inlet water velocity conditions and the variation of the curve profile. The convergent section is designed using third, fifth and seventh order polynomial equation, respectively. The result to shows that the optimization...
This paper has presented a numerical simulation method of the temperature field in the ceramic roller kiln. The method was that the model of firing zone with single-kiln was created by fluid dynamics software in which the standard k-epsiv turbulence model, DO radiation model and PDF combustion model were adopted. The model considered the size and structure of the kiln, the inlet and outlet status...
This paper proposes a modified Reynolds equation for the coupled journal and thrust fluid dynamic bearings (FDBs) to include variable film thickness due to imperfect roundness of a rotating shaft. A finite element method is used to solve the modified Reynolds equation to calculate the pressure. Reaction force, moment, and friction torque of FDBs are calculated by integrating the pressure and shear...
This research proposes a modified Reynolds equation for the coupled journal and thrust FDBs to include the variable film thickness due to the imperfect roundness of a rotating shaft. Finite element method is used to solve the Reynolds equation to determine pressure, reaction force and friction torque. The dynamic behavior of a HDD spindle system is determined by solving the equations of a motion in...
The infant incubator is an essential medical device for a new born whose weight is lower than a standard level or early birth. In general, many parameters such as air temperature, air circulation, humidity, oxygenation, noise level and sterilization must be controlled strictly all over an operation range. In this paper, we presented an analysis of heat transfer and air flow circulation in chamber...
Aerostatic thrust bearings are used in linear guideways as an alternative to contact bearings. The absence of friction in the motion makes aerostatic guideways most suitable for high precision and high speed machines. The low stiffness and damping of the aerostatic support limits their application to machining processes. Active compensation, applied to the bearing films, is proposed as a solution...
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