SINZIANA RADULESCU, IRENA LOREDANA NEGOITA, ION ONUTU HEAT TRANSFER COEFFICIENT FOR HYDROCRACKED OIL FLOW IN LAMINAR REGIME THROUGH AN ANNULAR SPACE
In this paper it is presented a correlation based on experimental data for the prediction of the laminar heat transfer coefficient when cooling hydrocracked oil in the inner annulus of a horizontal triple concentric-tube heat exchanger. The cold fluid is water and the heat exchanger is operated under counter-current flow conditions. The test section used in the experiment was made of copper tubes with inner diameters of 12 mm, 26 mm and 40 mm, and a length of 1193 mm. Heat transfer coefficient values experimentally obtained were further compared with those calculated from the correlations existing in the literature for flowing through annular and circular spaces in laminar flow regime, acceptable deviations being obtained.