مقايسبندي طول موج لايه بندي و دياگرام فاز براي شارش مخلوطهاي دانه اي دوتايي در سلول هاي هل -شاوعمودي

Scaling of the wavelength of the strata and phase diagram for the flow of binary granular mixture in a vertical Hele-Shaw cell

The flow of binary granular mixture made of fine sand and sugar into a vertical Hele-Shaw cell gives rise to heaps exhibiting segregation and stratification. Our experimental study shows that the ratio of flow rate and wall separation decides which of these two will occur. We find the phase diagram of heap morphologies classified as a function of the ratio of flow rate and wall separation. We find that the wavelength of the stratification is scaled by this ratio. We observed that in every flow rate the product of wavelength, and wall separation remains constant, so the wavelength varies with wall separation by a monotonic function (lid). Granular stratification is found to occur only in a confined region of the parameter space. We present an interpretation for the existence of this region in phase space.