Final answer:
With a Reynolds number of 2900, the flow through the pipe is transitory, meaning it could oscillate between laminar and turbulent flows.
Step-by-step explanation:
A student has asked about the flow type through a pipe at a Reynolds number of 2900. Regarding the type of flow corresponding to a given Reynolds number, it is known that for values below 2000, the flow is laminar. For values above 3000, the flow is turbulent. However, for values between 2000 and 3000, the flow is unstable or transitory, and can oscillate between laminar and turbulent flow. Since a Reynolds number of 2900 lies within this range, it indicates that the flow could be oscillating between laminar and turbulent; hence, the correct answer is C. The flow is transitory, oscillating between laminar and turbulent.