Free convection in a stably stratified fluid between vertical plates.

Himeno, Nobuhiro; Hijikata, Kunio; Kawamoto, Kouichi

doi:10.1299/kikaib.55.2486

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“…Thus the temperature profile becomes rather uniform, though small fluctuation exists on the profile. As seen in the case of a stably stratified fluid between vertical plates [6,[16][17][18], according to the relation between the thickness of the convection layer and the heat transfer coefficient, the heat transfer coefficient, when a convection layer has an appropriate thickness, can be larger than that for a non-stratified fluid. In the case of Fig.…”

Section: Resultsmentioning

confidence: 99%

“…This occurred while conducting an experimental study on a thermal energy storage system using a binary mixture [4,5]. This discovery motivated the author to investigate free convection in a stratified fluid and to clarify its flow characteristics on uniform and non-uniform cellular layers [6]. Since then many studies in Japan have been performed in this field, where research has focused on the flowing feature associated with this issue.…”

Section: Introductionmentioning

confidence: 99%

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Inner cylinder diameter effects on free convection heat transfer in a stable stratified fluid

Himeno

Masuda

2007

Heat Trans. Asian Res.

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An experimental study was performed to identify the effects of the inner cylinder diameter on free convection heat transfer in a stable stratified fluid between coaxial cylinders. The stratified layer was formed using a sucrose aqueous solution, and was heated from the outer cylinder (70 mm I.D.) at a constant heat flux and cooled from the inner cylinder at a constant temperature. The experiment was conducted for an inner cylinder of 50.8 mm O.D. and the results were compared with those for an inner cylinder of 30 mm O.D., which were previously reported by the authors. The results show that the inner cylinder size affects the heat transfer in the early stage of heating: increasing the diameter of the inner cylinder decreased the distance between the heating and cooling surfaces. It consequently reduced both the duration of heat conduction prevailing and the resulting temperature increase of the heating surface during that period. Increasing the diameter of the inner cylinder also made the heat transfer characteristics similar to those between vertical plates.

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Section: Resultsmentioning

confidence: 99%