fixed bed

...When solid particles are stationary and a fluid is allowed to flow through the voids between the solids and the fluid, heat transfer, mass transfer, chemical reactions, etc. are performed by contacting the solids and the fluid, the particle bed is called a fixed bed or a packed bed. When the particles in the packed bed are continuously removed from the bottom and new particles are added from the top, causing the particles in the bed to gradually fall due to gravity, and the solids and the fluid are continuously contacted, it is called a moving bed.

*Some of the terms that refer to "fixed bed" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…固体粒子を静止させ，その空隙内に流体を流し，固体と流体の接触操作によって熱移動，物質移動，化学反応などを行わせるとき，その粒子層を固定層fixed bedまたは充てん(塡)層packed bedという。充てん層内の粒子を底部から連続的に抜き出し，上部から新しく供給して，層内粒子を重力により少しずつ降下させ，連続的に固体と流体の接触操作を行うとき，これを移動層とよんでいる。…

※「fixed bed」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報