Koji Shiina

Cooling characteristics of an impinging spray jet which forms an ellipsoidal liquid film

The cooling characteristics of an impinging spray jet which forms an ellipsoidal liquid film were experimentally investigated in order to estimate the cooling performance of a rotating roll in a hot mill system

Heat transfer characteristics of fluid flow in an annulus with an inner rotating cylinder having a labyrinth structure

The convective heat transfer coefficient was experimentally investigated in an annulus with an inner rotating cylinder to estimate the thermal fatigue of the inner and outer cylinders on the rotating machine. The following three conclusions were obtained: (1) Within the range of the experimental conditions, the heat transfer coefficient did not depend on the axial flow rate; rather, it showed a larger dependence on the inner cylinder rotating speed. (2) The heat transfer coefficient at the top of the labyrinth was about three times as large as that at the bottom. (3) An empirical correlation equation considering the gap between the inner and outer cylinders is proposed, which predicts the heat transfer coefficient on the rotating machine within ±30 percent.

HEAT TRANSFER CHARACTERISTICS OF FLUID FLOW IN AN ANNULUS WITH AN INNER ROTATING CYLINDER HAVING A LABYRINTH STRUCTURE

The heat transfer coefficient of fluid flow was experimentally investigated in an annulus with an inner rotating cylinder to estimate thermal fatigue of the inner and outer cylinders on the rotating machine. Following three points were found in the study. (1) Within the range of the experimental conditions, the heat transfer coefficient did not depend on the axial flow rate, rather it had a large dependence on the inner cylinder rotating speed. (2) The heat transfer coefficient at the top of the labyrinth was about three times as larger as that at the bottom. (3) An empirical correlation equation considering the gap between the inner and outer cylinders was proposed, which predicted the heat transfer coefficient on the rotating machine within ±30%.

Shell side heat transfer characteristics with an eggcrate support plate for water in parallel flow

The shell side heat transfer and pressure drop for water in parallel flow with an eggcrate support plate were experimentally investigated in order to obtain higher performance for the heat exchanger in a boiling water reactor power plant. The following three conclusions were reached. (1) The shell side heat transfer characteristics with the eggcrate support plate were twice as large as those of the shell side parallel flow. An equation using the Reynolds number of the eggcrate support plate could predict the heat transfer coefficient. (2) The shell side pressure drop characteristics with the eggcrate support plate were about five to six times as large as those of shell side parallel flow. (3) The enhancement constant of heat transfer with the eggcrate support plate, using Colburns j-factor and friction factor f, was the same as that of the ROD-baffle type, and was about two times as large as that of the segmental baffle type.

Boiling heat transfer characteristics in liquid–liquid direct contact parallel flow of immiscible liquids

Boiling heat transfer characteristics in liquid-liquid direct contact parallel flow of immiscible liquids were investigated. The effect of operating conditions and column specifications on the UA factor of heat transfer were determined and the following empirical correlation is proposed for conditions where subcooling is constant: St= k 1 + k 2 M *a H *b Z *c N *d . The Stanton number for heat transfer to the dispersed phase correlates with the product of the Jacob number and the Prandtl number, H * . A comparison of heat transfer-flow pattern and the correlation equation for heat transfer show good agreement within a range of ±30%.