مطالعه هيدروليك جريان درون قطره چكان ها با استفاده از ديناميك سيالات محاسباتي

Study of hydraulic flow inside the emitters by computational fluid dynamics

Production of a suitable emitter need time and is expensive. On the other hand, because of small size and complex structure of labyrinth-channel used in most of drip emitters, it is not possible to observe the flow behavior of water passing through the channel. In this study, the flow in labyrinth channels was simulated by using the method of computational fluid dynamics (CFD) to calculate the distributions of pressure and velocity of the flow. And relationship between pressure and rate of discharge under six levels of pressure were studied. For this purpose, three samples of one type emitter were selected. The emitters were destroyed and sizes of those channels were calculated by photography with Scanning Electronic Microscope (SEM). To calculate the relationship between pressure and rate of discharge as well as simulation of flow in emittersʹ channels using Computational Fluid Dynamics (CFD), laminar flow model and turbulence model was applied. The results were compared with the pressure and flow rate from laboratory test. Results of simulated data showed a good agreement with the experimental data and also difference between laminar and turbulence models were not significant