A Model-study on the Heat Transfer and Flow in the Heating Coil in Cargo Oil Tanks

Abstract

This paper is a report on the further study on the heat transfer and flow of the mixture of steam, condensate and air in a glass tube simulated to the heating coil in the cargo-oil tank of the oil carrier. The inside diameter of the glass tube is 15 mm, which is larger than the inside diameter in the preceding experiment. It was demonstrated that the condensate could be discharged continuously from the outlet only when the supplied steam pressure was in a limited range. If the steam pressure is excessive, steam will blow out sooner or later from the outlet end of the coil. If the steam pressure is insufficient, the condensate hold-up in the heating coil continues to increase and will finally occupy the entire tube. When the heating section of the coil is in a horizontal plane and steam is supplied at the pressure within the above mentioned limits, a strong fluctuation is brought about in the condensate flow. When the heating coil has ups and downs in the heating section, the air and the condensate flow across the ups and downs in a particular way. The result of the experiment indicates that hot-water is a more suitable medium than steam for cargo-oil tank heating.