Keiji Murata

Heat and mass transfer with condensation in a fibrous insulation slab bounded on one side by a cold surface

This work presents an experimental and analytical investigation of heat and mass transfer with condensation in a fibrous insulation slab, one side of which is exposed to high temperature and high humidity, and the other side bounded by a cold surface. The analysis carried out is based on a model in which condensation occurs on the cold surface and in the interior of the fibrous insulation, and condensate falls away under gravity. Predicted heat transfer coefficients agreed well with experimental data at atmospheric pressure and temperatures up to 100°C. It was also indicated by the analysis that the convective contribution is appreciable in higher pressure and temperature environments.

Development of methanol steam reformer for chemical recuperation

The purpose of the present work is to establish the design method of methanol steam-reformer for application to chemical recuperation in a gas turbine system. The reaction rate of the methanol steam-reforming was measured with a small amount of catalyst using the gaseous mixture of methanol, water, hydrogen and carbon dioxide as a simulated product gas. The reaction rate equation could be expressed by power law of methanol mole fraction and total pressure. The reaction and heat transfer in the catalyst-packed bed was analyzed numerically using the reaction rate equation. The analytical results of temperature distribution and conversion were compared with the experimental results using a reforming tube. These results agreed well except for the region of high methanol conversion.

PREDICTION OF CONDENSATION HEAT TRANSFER COEFFICIENT IN HORIZONTAL INTEGRAL-FIN TUBE BUNDLES

A method of predicting the condensation heat transfer coefficient in horizontal integral-fin tube bundles with negligible vapor shear is proposed and compared with experimental results. This method is based on an analytical model talcing the condensate inundation effect into account, where the condensation heat transfer coefficient decreases due to a decrease in effective fin area as condensate flows through the interfin spaces. Heat transfer measurements were carried out in eight-row tube bundles consisting of integral-fin tubes with 35, 26, and 16 fins/in. Refrigerants Rll and R114 were used as test fluids. The proposed method was able to predict the condensation heat transfer coefficient with enough accuracy to enable condensers to be designed without the need for complex calculations.

G226 Thermal Control of a Layer of Corroding Iron Powder

This paper presents an experimental investigation of the thermal characteristics in a layer of an exothermic powder mixture that is utilized in body warmers, hot compresses, etc. The research objective is to develop a manufacturing method that enables the exothermic temperature to be controlled in order to prevent cases of low-temperature burns. This powder mixture is composed of iron powder, activated carbon powder, vermiculite and NaCl.百levariation over tIIne of the temperature distribution and the generated heat in a layer of the exothermic powder mixture is measured. Absorbent polymer and nonwoven fabric are used to control the water and oxygen volume supplied into the layer, and their effects are examined. Keyword Iron Powder, Corrosion, Exothermic powder, Chemical reaction, Temperature con仕01,Absorbent polymer, N onwoven fabric