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The fluid in the pipe or in the kiln system flow, if any section of the flow (velocity, pressure, severe, component etc.) do not change over time, this flow is called the steady flow; conversely, the flow parameters change with time, is called the unsteady flow. In fact, the fluid (such as gas, heavy oil) in a pipeline or flow in the kiln system, as long as the fluctuation is not too high, can be regarded as the steady flow.
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