Turbulent mixing in non-isothermal jet in crossflow

LES/FMDF of turbulent reacting jet in cross-flow

“…There are various criteria to measure the mixing in JICF (Boss, 1986; Cárdenas et al , 2010; Denev et al , 2009; Priere et al , 2004). In our previous studies (Esmaeili et al , 2015a; Esmaeili et al , 2015b), the spatial mixing deficiency, the spatial unmixedness and the mixedness, are introduced as a measure of mixing in non-reacting JICF. In the present study, the mixture fraction decay along the jet trajectory is used to evaluate the mixing of the jet with the cross-flow which is a proper criterion for reacting cases.…”

“…Karagozian (2010), Karagozian (2014), Mahesh (2013), Margason (1993). Non-reacting JICF’s are investigated both experimentally (Andreopoulos and Rodi, 1984; Cambonie and Aider, 2014; Su and Mungal, 2004) and numerically (Esmaeili et al , 2015a; Muldoon and Acharya, 2010; Yuan et al , 1999). In these studies, the effect of jet to cross-flow density ratio, velocity and momentum ratios, jet Reynolds number, jet arrays, jet nozzle, and jet swirl and pulsation on the JICF vortical structures and flow and mixing characteristics have been investigated.…”

“…Previous applications of this approach have focused on developing and testing fundamental problems. Colucci et al (1998) considered the scalar form of FDF, while Jaberi et al (1999) and many others used the scalar FMDF (Esmaeili et al , 2015a; Afshari and Jaberi, 2005; Afshari et al , 2008; Banaeizadeh et al , 2011; Jaberi, 1999; James and Jaberi, 2000; Nik et al , 2010; Sheikhi et al , 2005; Yaldizli et al , 2010; Yilmaz et al , 2010; Esmaeili et al , 2015b; Banaeizadeh et al , 2013; Esmaeili and Afshari, 2019). Moreover, velocity and velocity-scalar FDFs and even velocity scalar FMDF were derived (Sheikhi et al , 2005; Sheikhi et al , 2007; Gicquel et al , 2002; Sheikhi et al , 2003).…”

“…Here, the hybrid LES/FMDF is applied to reacting JICF which is a fundamental configuration frequently used in industrial combustion systems. It is worth-mentioning that the reliability of hybrid LES/FMDF solver is well-validated by carrying out the DNS and LES of various turbulent reacting and non-reacting problems such as isotropic turbulence, round/planar turbulent jets (Jaberi et al , 1999), non-reacting jet in cross‐flow (Esmaeili et al , 2015a; Esmaeili et al , 2015b; Esmaeili and Afshari, 2014), internal combustion engines (Banaeizadeh et al , 2013), premixed combustion in a backward‐facing step combustor (Esmaeili and Afshari, 2019) and high‐Reynolds number turbulent flows in axisymmetric dump combustors (Afshari et al , 2008).…”

Interaction mechanism model for a nonisothermal air jet and a buoyant plume

“…And the researches have been done focusing on nozzle supply air distribution under different building conditions, under different indoor environments, or under different nozzle structures. [23][24][25][26][27][28][29] However, such qualitative experiments of the temperature and flow field do not give direct information on the flow resistance between the buoyancy source (the plume) and the momentum source (the air jet), regardless of the manner in which the plume and air jet were created. As a result, there is no generally accepted means by which to define the flow resistance between the buoyancy source (the plume) and the momentum source (the air jet).…”