Upstream penetration of developed counter flow resulting from impingement of multiple jets in crossflow of cylindrical duct

TL;DR

This paper investigates the upstream penetration of counter-flow jets in a cylindrical duct with crossflow, aiming to understand recirculation zones for improved chemical mixing and rapid quenching processes.

Contribution

It provides new insights into the behavior of counter-flow jets and recirculation zones in crossflow, which is crucial for optimizing mixing in chemical technologies.

Findings

Identification of the recirculation flow zone (RFZ) upstream of jets

Quantitative analysis of RFZ size and jet dilution

Insights into non-equilibrium mixing conditions

Abstract

It is of special interest in some conventional chemical technologies to provide either fast mixing of reagents or rapid quenching of final chemical product. One of most promising techniques to achieve it is mixing of multiple jets radially injected in crossflow (JIC) of cylindrical duct when jets impinge and form a jet flowing towards a crossflow. As result of an interaction of counter-flowing jet and confined crossflow, a recirculation flow zone (RFZ) upstream of jets injection plane (JIP) is formed (see Fig.1). Of valuable importance is to reveal upstream behavior of developed counter-flowing jet in confined crossflow in order to estimate an extreme RFZ size where jets are diluted and mixed under non-equilibrium conditions.