Heat transfer to boiling binary liquid mixtures

A study of the heat transfer characteristics of boiling solutions of normal propyl alcohol, water and their binary mixtures was carried out at atmospheric pressure in a single-tube, natural circulation evaporator. The test-section consisted of a copper tube, 0.485" i.d., heated length 47.75" and wall thickness 0.085". Saturated steam was used as the heating medium. The variable experimental parameters were liquid composition, the overall temperature difference between steam and bulk liquid and the liquid submergence level in the tube. Liquid and vapour flow-rates were measured continuously at the tube outlet and inlet liquid and exit liquid and vapour streams were sampled for each experimental binary mixture run. These values were compared with those obtained from the equilibrium curve for the system. [Continues.]