Abstract
Heat transfer enhancement in packed bed reactor is investigated. As a thermal conduction enhancer, carbon fiber brushes with a high thermal conductivity are inserted in the packed bed. In order to achieve higher thermal performance, the carbon fiber brush is attached to the heat transfer wall with a supporting material containing carbon nanotube (CNT). The CNT is particularly used due to its high thermal conductivity. As a result, silicone rubber is suitable for the supporting material because it is so soft that it prevents from increasing local void fractions near the heat exchange wall. In addition, improvement of heat flow in a packed bed is studied using CNT itself. As a result, both the effective thermal conductivity and the heat transfer coefficient between packed bed and reactor wall are improved particularly for larger particles.
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