Proceedings of the
International Conference on Mechanical Engineering 2009
(ICME2009) 26- 28 December 2009, Dhaka, Bangladesh

ICME09-FM-36

ANALYSIS OF A NEGATIVELY BUOYANT JET

Chandan Kumar, D. Das and M.M. Razzaque
Department of Mechanical Engineering, Bangladesh University of Engineering and Technology (BUET),
Dhaka, Bangladesh.

ABSTRACT

The behavior of plane fountains, resulting from the injection of dense fluid (water) upwards into a large container of homogeneous fluid of lower density (air), is investigated. In this study we experimentally examine the behavior of fountains for different Froude and Reynolds numbers. The fountain inlet flow rate and nozzle diameter of the inlet fluid is varied to cover a wide range of Reynolds and Froude numbers. Fountain behavior is observed by changing the inclination angle of the fountain for different nozzle diameter and flow rate. We found that the penetration height greatly depends on Froude number. We develop an empirical correlation of the non-dimensional fountain height with Froude number (H/r =1.452Fr1.94). But well defined by both Reynolds and Froude number. Finally we also develop an empirical correlation of the non-dimensional fountain height Reynolds and Froude number (H/r= Re-0.72Fr2.26) by numerical regression. The result are compared with previous numerical and experimental results and found consistent.
 

Keywords: Buoyant Jet, Negatively Buoyant Jet, Fountain, Positively Buoyant Jet, Reynolds Number.

Click Here to download full report.