【Daily Question】Theoretical Foundation 2019.12.24
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Fill-in-the-blank: In a flow system, if the velocity, pressure, density, etc. of the fluid at a given cross-section change only with ( ), and not with ( ), it is called steady flow. If the above quantities change both with ( ) and with ( ), it is called unsteady flow. Answer: Location, time ； Time, location. Hint: An additional reward will be given to those who can explain the problem-solving process; the answers can be seen in the response!
Location, time； Location, time
Location, time, time, location
In a flow system, if the flow velocity, pressure, density, and other properties of the fluid at a given cross-section vary only with position and not with time, it is referred to as steady flow. If all the quantities mentioned above vary both with (time) and with (position), it is called unsteady flow.
Location Time Location Time
Location??Time? ???Location??Time
Location, time； Time, location
Location, time； Time, location
Location, time, time, location
Location Time Location Time