DISPERSED FLOW HEAT-TRANSFER IN CIRCULAR BENDS

This paper presents an experimental study of dispersed flow heat trans fer in 90-degree circular bends. From extensive measurements, two diff erent heat transfer patterns are identified, i.e, heat transfer withou t and with rewetting. Their intrinsic mechanisms are analysed, based o n the present experimental evidence and our previous theoretical studi es. Effects of mass flow rate, wall heat flux, system pressure and cur vature ratio on heat transfer are also investigated. An empirical crit erion is developed to identify the heat transfer pattern in the bend.