Numerical study on laminar round jet of high density gases discharging into stagnant air

The objective of present study is to investigate numerically the fluid flow and mass transfer of a laminar round jet of high density gases (CO2, Ar) discharging into stagnant air along the gravity force. The flow and mass fraction distribution analyses were carried out by a modified TEAM (Turbulent Elliptic Algorithm Manchester) code which solved elliptic equations using staggered grid system. As the result, the followings were obtained in the range of reciprocal Froude number (x-bar/Fr) from 0 to 2,250: (1) The velocity along the jet axis increased because the jet was accelerated by gravity force. (2) In the case of CO2 jet, mass flux of CO2 along the jet axis increased slightly in x-bar/Fr < 500 and decreased in x-bar/Fr > 500. (3) It was characteristic feature of laminar round jet of two component gases that half radii of axial velocity, mass fraction and mass flux of high density gases had the minimum value along the jet axis. (author)