It is well known that the fluid dynamics of arterial blood flow through stenosis play an important role in progression of arterial diseases. Pulsatile flow through an axisymmetric stenosed tube is visualized using hydrogen bubble method. The flow patterns and velocity distributions are obtained. The meaning of timelines in unsteady flow condition is considered by comparison with numerical results. Since numerical results show good agreement with experimental results, it is indicated that flow condition can be understood by transformation of timelines. The effects of the Stokes number and the Reynolds number are also investigated in this paper. It is found that the vortex becomes strongest at a certain frequency and that the spacing between vortices is inversely proportional to the Strouhal number.
The paper describes quantum chemistry analysis using ab initio molecular orbital method to know microscopic mechanisms of plasma-assisted reactions and their visualization of geometrical configurations from the reactant to product via the transition state. Attention is paid to such key reactions as CH4+O→CH3+OH and CH3+OH→CH3OH which play important roles to produce methanol with the aid of plasma reactability. The analytical results prevail that the quantum chemistry approach together with molecular level visualization is a powerful tool to understand the plasma reaction processes.
Authors discovered a flip-flop flow phenomenon in network ducts of flow through banks of diamond-shape columns and circular tubes. An experimental study was performed to disclose the flow characteristics of newly typed flow networks with which slotperforated plate bundles in three rows were arranged in different types. The depth of their ducts was almost the same as the relative length of the slot-perforated plate bundles. The flow patterns were visualized using the tracer method and the velocity variations in the flow field were measured using two-dimensional laser Doppler velocimetry. It is disclosed that the difference of vortices occuring in the slot-perforated plate bundles depends on their arrangements. It is also found that the distinct flow characteristics are shown in the cases of the arrangement with which the intersecting angles connecting the centers of gaps of plate bundles are 30° and 60°, respectively.
In this paper, I explain "Autonomous Behavioral Vehicle" which enhance reality of virtual space, in realization of architecture landscape simulation by using virtual reality method. "Autonomous Behavioral Vehicle" has capability to control autonomously its own behavior, such as "steering" and "speed control" in accordance with the status of other "Autonomous Behavioral Vehicle" and signals. I employ the concept of "following path method" to realize autonomous "steering" and that of "personal space" to realize "speed control". The virtual space which is constructed only with static buildings become more active and real by making the "Autonomous Behavioral Vehicle" drive in the virtual space.