Abstract:
The current research focuses on experimentally exploring thermal enhancement and
pressure drop in a tube equipped with detached hollow turbulators of different shapes. A
novel aspect of this study is the examination of the impact of disk clearance from the
inner wall, a factor that holds significant potential for enhancing thermal performance
when optimized. The experiments were conducted within the turbulent airflow regime,
covering Reynolds numbers ranging from 10,000 to 30,000.
Two critical design variables, namely the outer diameter ratio (DR = do/D) and the pitch
ratio (PR = P/D), were scrutinized to identify the optimal geometry. The inserts were
spaced at pitch ratios of 1, 2, and 3. Various outer diameter ratios of 0.6, 0.7, and 0.8
were tested, with the tube's inner diameter fixed at 48 mm and outer diameter at 50.8 mm.
The experimental results for the increase in Nusselt number and friction factor were
observed and analyzed.
