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Suppose a fluid passes from having laminar flow, to having a turbulent flow (like when passing after an object). How do fluid speed and fluid density change after that?

turbulent flow

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  • $\begingroup$ I assume you mean the average speed and density, as the instantaneous values in a turbulent flow are highly complex and chaotic. Also, I think you need to be clearer about the flow situation: is this in a pipe? External flow? Is it incompressible/compressible? $\endgroup$ – Time4Tea Sep 27 at 11:19
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Velocity;
In the case of pipe flow, the velocity remains constant simply through continuity, and the losses are influencing only to pressure. In the open channel flow the velocity depends on up- and downstream conditions, and can therefore even be higher after the object, but also lower if the object causes a hydraulic jump.

Density;
In the pipe flow the density is influenced only through the thermal expansion caused by the pressure turning to heat. In the open channel flow the density can change quite a lot if air entrainment occurs. The Turbulence has only indirect influence to density.

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  • $\begingroup$ I assume here you are referring to the mean values? This answer seems to be assuming the flow is internal, within a pipe, which is not made clear in the question. Also, I'm not sure if open-channel flow is relevant - the effects of turbulence there may be very different to non-open flows. $\endgroup$ – Time4Tea Sep 27 at 11:21

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