ARTICLE:

• NATURAL CONVECTION IN A VERTICAL RECTANGULAR ENCLOSURE WITH SYMMETRICALLY LOCALIZED HEATING AND COOLING ZONES  download article

T. Fukui
Dept. of Mech. Eng., Kansai University, Suita, Osaka 564-8680 JAPAN

Isao Ishihara
Dept. of Mechanical Engineering, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, JAPAN

Ryosuke Matsumoto
Department of Mechanical Systems Engineering Kansai University, 3-3-35 Yamate-cyo, Suita, Osaka 564-8680, Japan

ABSTRACT

Numerical and experimental studies of natural convection in a single phase, closed thermosyphon were carried out using a vertical, rectangular enclosure model. Symmetrical two vertical plates plays role of the heat transfer surface having 100 × 100 mm². The symmetrical heat transfer surfaces are separated into three horizontal zones with an equal height; top 1/3 and bottom 1/3 of the surface are the zones of cooling and heating respectively and intermediate section is an adiabatic zone. Silicon oil is used as the working fluid. Variable parameters are distance D between two heat transfer surfaces, and temperature difference ΔT between heating and cooling zones. By changing both D and ΔT, three regimes of natural convection flow; quasi-two-dimensional steady, three-dimensional steady and unsteady flows were found in both the simulation and experiment. Numerical simulation agreed well with experimental results of the temperature and velocity of the fluid visualized by means of thermo-sensitive liquid crystal powders.

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843-850 pages

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