Background: Wavy channels are considered to be an effective passive method for heat transfer
enhancement and are widely used in different heat exchanger devices. Various relevant papers and
patents report significant increase in convective mixing of the fluid in the wavy channel when it is operated
in unsteady flow regime. Consequently, a significant amount of research has been devoted to
unsteady flow regimes of wavy channels to better understand the physical mechanism behind the enhancement
in heat transfer.
Objective: To find the role of monitoring point in predicting flow regimes for periodically fully
developed flow conditions in a biconvex module of sinusoidal wavy channel.
Methods: In the present study, two-dimensional numerical investigations are carried out to identify the
flow regimes for periodically fully developed flow in sinusoidal wavy channels. Computations are carried
out using commercial software ANSYS Fluent 17.2. Time signal analysis is carried out for four
different points in the flow domain to understand the flow regimes indicated by the points.
Results: Detailed temporal variation of x-velocity, its power spectral density and phase space trajectories
are presented to understand the flow regimes indicated by the four different points. Even though
power spectral density shows difference in nature of velocity signals at the four locations considered,
for the three different Re values, phase trajectories illustrate near similar flow regimes.
Conclusion: Phase space trajectories of four different points indicate that monitoring velocity at any
point in the domain is enough to predict the flow regimes in periodically fully developed flow.