The optimal operation strategy involves two step up and down jumps between zero and a maximum allowable fluid flow rate in the primary circuit.
The eddy currents and velocity fluctuations in turbulent motion produce increased pressure drops and thus, limit the maximum obtainable fluid flow rate.
An excessive friction pressure loss due to the small tubing diameter and curvature (which is believed to cause secondary flow) of Coiled Tubing (CT) often limits the maximum obtainable fluid flow rate in most CT operations.
For the first was used the classical computation method and, for the second method, the principle of extraction the maximum power from the fluid flow was considered.
To obtain the maximum net power with fluid flow resistance, the optimal cross section area should be 0.0056 m2, with the optimal scales at a height of 0.005 m, and length of 0.56 m, when applied in an automotive vehicle.
However, for the viscoelastic fluid flow the maximum Deborah number achieved in the numerical simulations is about one order of magnitude lower than the critical Deborah number for the onset of the elastic instability found in the experiments.
To receive the maximum power, one would like to increase the working fluid flow rate.
