@article{oai:jaxa.repo.nii.ac.jp:00031435,
 author = {KWAK, Ho Sang and KUWAHARA, Kunio},
 journal = {The Institute of Space and Astronautical Science report},
 month = {Mar},
 note = {Transient cool-down process of a fluid from an initial high temperature to a target temperature in a closed container is investigated numerically. The fluid has a quadratic density-temperature relationship, and the maximum density occurring at T_m. Cooling is accomplished by abruptly lowing the sidewall temperature, and the mean temperature passes through T_m in the course of cool-down. A finite-volume method is employed to acquire numerical solutions to the full, time-dependent two-dimensional Navier-Stokes equations. In order to simulate the realistic situations under micro gravity, the Rayleigh number, Ra, encompasses the range 10^5 ≤ Ra ≤ 10^8. The effects of the density inversion on the cool-down are illuminated. Based on the structures of the aidewall boundary layer, three characteristic flow regimes are identified at early time. The qualitative early-time behavior is detemined by the density inversion factor. Evolutions of the global fields of flow and temperature of each flow regime are described. The analysis of time-dependent heat transfer characteristics reveals that the cool-down process is divided into several definite transient phases. The relevant time scales for the overall cool-down process are estimated. The specific effects of the Rayleigh number, density inversion factor, and the aspect ratio of the container on each evolutionary stage are elaborated., 資料番号: SA0035249000},
 pages = {1--18},
 title = {Transient Cooling of an Enclosed Fluid through Its Maximun-Density Temperature},
 volume = {667},
 year = {1997}
}