TY - JOUR
TI - The effects of arbitrary injection angle and flow conditions on venturi-jet mixer
AU - Sundararaj Subramanian
AU - Selladurai Velappan
JN - Thermal Science
PY - 2012
VL - 16
IS - 1
SP - 207
EP - 221
PT - Article
AB - This paper describes the effect of jet injection angle, cross flow Reynolds  number and velocity ratio on entrainment and mixing of jet with  incompressible cross flow in venturi-jet mixer. Five different jet injection  angles 45o, 60o, 90o, 125o, 135o are tested to evaluate the entrainment of  jet and mixing performances of the mixer. Tracer concentration along the  downstream of the jet injection, cross flow velocity, jet velocity and  pressure drop across the mixer are determined experimentally to characterize  the mixing performance of the mixer. The experiments show that the  performance of a venturi-jet-mixer substantially improves at high injection  angle and can be augmented still by increasing velocity ratio. The jet  deflects much and penetrates less in the cross flow as the cross flow  Reynolds number is increased. The effect could contribute substantially to  the better mixing index with moderate pressure drop. Normalized jet profile,  concentration decay, jet velocity profile are computed from equations of  conservation of mass, momentum and concentration written in natural  co-ordinate systems. The comparison between the experimental and numerical  results confirms the accuracy of the simulations. Correlations for jet  trajectory and entrainment ratio of the mixer are obtained by  multivariate-linear regression analysis using power law.