化工学报2011，Vol.62Issue(12)：3367-3372,6.DOI:10.3969/j.issn.0438-1157.2011.12.009
搭接方式对螺旋折流板换热器壳程性能的影响
Effects of baffle connection manner on shell-side performance of heat exchanger with helical baffles
摘要
Abstract
A 3D numerical investigation for heat exchanger with helical baffles was carried out to study the effects of baffle connection manner on shell-side flow and heat transfer characteristics under the same helical pitch. The results show that both the shell-side heat transfer coefficient and pressure drop decrease with the increase of the overlap size at certain mass flow rate. The latter decreases more quickly than the former. When the baffles are arranged in a continuous manner, the leakage from the triangle zone increases the velocities of fluid flowing across the tube bundle perpendicularly and along the tubes in the central zone, but the overall velocity distribution is non-uniform and the flow on the leeward side is poor. As the overlap size increases, the leakage from the marginal triangle zone increases the velocity in the region near the shell so that the flow field is improved. The heat flux on the central tubes is much lower and the heat transfer is more uniform along the radial direction when the adjacent baffles are connected in an overlapped manner compared with the case when the adjacent baffles are arranged in a continuous manner.关键词
螺旋折流板/连续搭接/交错搭接/换热器Key words
helical baffles/ continuous connection/ overlap connection/ heat exchanger分类
能源科技引用本文复制引用
曹兴,杜文静,汲水,程林..搭接方式对螺旋折流板换热器壳程性能的影响[J].化工学报,2011,62(12):3367-3372,6.基金项目
国家重点基础研究发展计划项目(2007CB206900) （2007CB206900）
国家自然科学基金项目(51106090). （51106090）
