A fundamental study of flow characteristics and heat transfer in multiple burner oilfired marine boilers.

This study has shown that the main characteristics of axial velocity
decay and recirculation in multiple enclosed jets can be related to those
of single enclosed jets. This is achieved by considering each jet to be
bounded by an imaginary duct whose dimensions can be related to the nozzle
spacing parameters. If the nozzles are close together compared with the
surrounding chamber, the above treatment is only valid near- to the nozzles.
Further downstream the jets coalesce and their behaviour can be related to
that of a single jet by an equivalent nozzle radius.