Experimental study of gas-liquid heat transfer in a 2-phase flow in a packed bed

The paper deals with an interfacial heat exchange between gas (air) and liquid (water) flowing countercurrently through a packed bed. The experimental investigation was performed with the use of column of 0.1 m inner diameter and filled in with glass Raschig rings. Loads of working media ranged between 0.018÷0.142 m3(m2s)-1 and 0.0007÷0.0053 m3(m2s)-1 for gas and liquid phases, respectively. It was found that interfacial Nusselt number is mainly dependent on the gas load, noticeably influenced by the temperature difference between phases and practically independent of the liquid load.