Development of a Particle Bed Heat Exchanger (III) -An Experimental Study on Pressure Drop in Fixed Bed Heat Exchanger

입자층(粒子層)을 이용한 열교환기(熱交換器) 개발(開發)에 관한 연구(硏究)(III) -고정층(固定層) 열교환기(熱交換器) 내(內)에서의 압력손실(壓力損失)에 관(關)한 연구(硏究)

Fixed bed is known to be an effective heat transfer augmentation device which could be applied to heat exchangers. In this study, pressure drop in vertical cylindrical and annular fixed beds with air flowing through was experimentally investigated. Based on the experimental data and some analytical considerations, the demensionless correlation of pressure drop has been determined and shown in empirical forms. In particular, the experimental equation for the pressure drop was derived using the particle diameter and the bed diameter as variables, which would be more practical and useful in the design of heat transfer devices, instead of void fraction which had been used previously as the major variables by others. The present empirical equation obtained for the cylindrical fixed bed were found to be applicable also to an annular fixed bed when the concept of effective diameter was introduced.