Abstract
Unsteady flows in a channel with oblique plates have been numerically investigated. The oblique plates as disturbance promoters are installed at the upper wall. Unsteady characteristics are examined for Re = 350 and the plate angles of a = 60。- 120。. The flow fields represent three-dimensional features variously as the plate angle varies. From frequency analysis, it is noted that the disturbed flow by the oblique plates has peculiar unsteady modes. As the flow is more unstable, multiple frequencies are appeared.
Highlights
Many researchers have paid much attention to the unsteady flow of a channel having various obstacles such as fins, ribs, baffles or plates [1]-[10]
The highly unsteady flows have positive influences on the heat transfer enhancement, because it can provoke the flow mixing [1] [2]. The plate of those obstacles has the geometric advantages to control the flow unsteadiness depending on the variation of plate height, plate interval, and inclination angle
The turbulent flow is characterized by chaotic changes related to coherent vortices of many scales
Summary
Many researchers have paid much attention to the unsteady flow of a channel having various obstacles such as fins, ribs, baffles or plates [1]-[10]. The plate of those obstacles has the geometric advantages to control the flow unsteadiness depending on the variation of plate height, plate interval, and inclination angle. The laminar flow in a channel becomes turbulent flows, as the Reynolds number increases. The occurrence of many vortices can be connected directly to the turbulent flow or unsteady laminar flow. From this point of view, the disturbed flow by the plate is very interesting to study the unsteady evolution
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