Flow patterns and local heat transfer coefficients were measured for oil-water flow in a horizontal pipe. The test section was an 11 mm ID copper pipe with L/D ratio of 164. In this study, water and diesel fuel (2.49 mPa.s viscosity and 798 kg/m3 density) were selected as immiscible liquids and high speed photography technique was used for the flow pattern identification. Measurements were made for superficial Reynolds numbers in the range of 1350-13700 for water and 300-3700 for oil. Experimental results demonstrated that the heat transfer to flowing immiscible mixtures is strongly flow pattern dependent. In addition, a heat transfer correlation was developed for two flow patterns: stratified flow with mixing at the interface (STMI) and dispersion of water in oil and oil in water (Dw/o & o/w). The proposed correlation predicted the data with an average deviation of -2.768% and a standard deviation of 12.84%.
Hajir Karimi, Milad Boostani
Department of Chemical Engineering, Yasouj University, Yasouj 75914-353, Iran
Oil-water, Horizontal two-phase flow, Flow patterns, Heat transfer correlation