Host: The Japan Society of Mechanical Engineers
Name : The 30th International Conference on Nuclear Engineering (ICONE30)
Date : May 21, 2023 - May 26, 2023
Natural convection heat transfer outside the horizontal cylinder is a basic heat transfer process, which has a wide range of applications in engineering fields, such as pipe transportation, column heat sink, heat dissipation of containment, etc. In response to the current lack of experimental correlations at high Ra numbers, this paper adopts an experimental approach to carry out an experimental study of the natural convection heat transfer characteristics outside the cylinder under high Ra number conditions by constructing a large-size (d=2 m) horizontal cylindrical natural convection heat transfer experimental device. Through the analysis of available data, it is found that the Morgan formula and Churchill-Chu formula, which are commonly used for the calculation of natural convection heat transfer outside the horizontal cylinder, have large deviations from the experimental data under high Ra number (Ra>109) conditions. In this paper, a new experimental correlation suitable for high Ra number (102 <Ra <1013) is obtained by collecting previous published experimental data and combining them with the data obtained in this experiment.
