ID 283

Internal Flow Characteristics of Twin-Fluid "Y" Type Internally Mixing Atomizer

 

Abstract:

Internally mixing twin fluid atomizers are widely used in coal fired thermal power plants for start-up; oil- fired thermal power plants and industrial boilers. In this paper steam and fuel oil multiphase flow is numerically modeled to study the internal flow pattern and physics of the mixing jets in internally mixing twin fluid y-type atomizer. Scale resolving technique is used to resolve the larger eddies while the smaller eddies near the bound-ary layer are modeled with WMLES model. Relatively accurate but computationally expensive compressible Volume of Fluid (VOF) formulation is used to track the gas-liquid interface. The bulk of either of the phases is treated as non-interpenetrating while the interface is modeled as interpenetrating by approximating volume fraction in each cell as planar. It is found that the inviscid instability of the oil jet is amplified by shear of high velocity steam jet; leading to turbulent mixing of eddies. The liquid to gas momentum ratio is considered to be the appropriate parameter to describe the internal flow characteristics.