Abstract
This article focuses on description and evaluation of the size of the minor losses in pulsatile laminar flow. It describes a method for determination of minor losses with respect to the phase delay between pressure waveforms and flow waveforms. The whole evaluation method is presented on the example of minor loss in the sharp 90° bend in the channel with constant square cross-section in pulsatile laminar flow of an incompressible Newtonian fluid. For this example, the minor loss coefficient is expressed depending on the dimensionless flow parameters. Total minor loss was calculated numerically. An analytical solution was used for quantification of the head loss in the developed laminar flow in the straight channel. Unsteady flow conditions were controlled by the sinusoidal flow.
Highlights
In recent years, the attention has been concentrated on laminar pulsatile flow of fluids in non-round crosssection channels, mainly due to their increasing application in practice
In current works the values of local loss coefficients are determined for a specific application, especially from numerical simulation, which brings complications in the experimental research where the laminar flow is connected with measurement of small pressure differences and small flow rate
For oscillating flow component, where the impedance is a complex number Z] osc eiM, the impedance was evaluated separately as magnitude of impedance vector Z] osc and a phase shift M .For the evaluation of influences of particular parameters of the pulsatile flow on the local loss, 13 flow regimes were calculated with particular regimes being described in table 1
Summary
The attention has been concentrated on laminar pulsatile flow of fluids in non-round crosssection channels, mainly due to their increasing application in practice. These channels are used e.g. for mass or heat transfer in various solar systems [1], heat exchangers [2], blade machines, fuel cells [3,4] etc. In current works the values of local loss coefficients are determined for a specific application, especially from numerical simulation, which brings complications in the experimental research where the laminar flow is connected with measurement of small pressure differences and small flow rate. In order to verify the method described above, a square cross-section channel with a sharp 90° bend was chosen
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