Study of turbulent flow and conjugate heat transfer of plane wall and offset jets

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When a fluid is ejected from a nozzle, it forms a jet. A jet can be classified as free jet or bounded jet. If the effect of wall is negligibly small, then it is called a free jet; otherwise it is bounded jet. Bounded jets can be classified into three types: (a) wall jet where the fluid is discharged at the wall (b) offset jet where the fluid is discharged at an offset and parallel to wall and (c) impinging jet aimed towards the boundary. The present study aimed to understand the flow and conjugate heat transfer characteristics of the wall jet, offset jet and combined jet flows. Glauert [1] has defined a plane wall jet as a stream of fluid blown tangential along a plane wall. The wall jet consists of an inner region and an outer region. It is a combination of boundary layer flow over flat plate at inner region and plane free jet at outer region. The velocity profile has a point of inflexion. The surrounding medium of wall jet may be quiescent or co-flow or counter-flow depending upon the applications. Offset jet flow occurs when fluid is discharged from a slot in a vertical wall into the ambient near a horizontal solid boundary parallel to the inlet jet direction. The asymmetric entrainment on both side of the jet causes the flow to deflect towards the wall. This is called the Coanda effect [2]. The offset jet contains different flow features which are different in various regions. The region very close to the jet is dominated by the properties of the free jet. At the reattachment region, the jet can be partly described as impingement jet and in the far downstream, the jet attains the characteristics of the wall jet.
Supervisor: Manab Kr Das and P Muthukumar