EXPERIMENTAL AND NUMERICAL STUDY ON THE RISE OF BUBBLES IN THE VERTICAL WATER CHANNELS
Keywords:
Volume Of Fluid (VOF), High-Speed Camera’s (HSC’s), User Defined Function (UDF), Reynold Averaged Navier Stokes Equations (RANS), Three dimensional (3D)Abstract
This work investigates numerically and experimentally the behavior of air bubbles rise i.e. path and motion in vertical water channels using a submerged needle and the impact of water channel size on the behavior of rising air bubbles and contrasts this current threedimensional (3D) study with the earlier 2D studies. Experimental investigations were taken by installing two high-speed digital cameras (HSC’s). For smaller flow rates, the bubble's trajectories have been observed to spiral rather than rectilinear. The volume of fluid (VOF) approach is used for numerical analysis to investigate the trajectory of air bubbles in different water channels. The bubble trajectories of the front (x-y) plane and superimposed view of the (y-z) plane recorded during experimental investigations are drawn using MATLAB. Then graphical representations are drawn in MS EXCEL. The bubbles rise and follow a spiral path. Water channel size does not affect the behavior of rising air bubbles.
