高空げき率多孔性材料を用いた伝熱促適法の応用に関する実騳研究

摘要

The objective of this study is to clarify performances of a method for heat transfer enhancement using porous material with high porosity by an experiment. The experiment has been performed using an apparatus which simulated the passage structure of the steam reformer to obtain characteristics of heat transfer and pressure drop. From the results obtained in this experiment, the heat transfer rate by this method showed a good performance in the laminar flow regime. It was also found that the method for heat transfer enhancement using porous material with high porosity is further improved under the high temperature condition as compared with the other methods for heat transfer enhancement. There is the possibility of the adoption of this method to the steam reformer of the hydrogen production system connected to a high temperature gas-cooled reactor.%気体を熱伝達媒体として用いる熱交換器では，伝熱rn管表面にフィンや突起などを設けて伝熱を促進させるrnことが多い．一般的には，流速が早くなればなるほどrn流れの乱れにより熱伝達が良くなって，フィン等によrnる伝熱促進効果は相対的に小さくなるとされ，適用対rn象によっては経済性の観点から流速に対する最適値がrn存在する場合がある．