the_driving_force_of_circulation

1.The key lies in producing enough great driving force of natural circulation at reasonable heating temperature difference to make masted tape self-rotate reliably in heat transfer tubes.
其关键是能否在合理的加热温差下产生足够大的自然循环推动力，足以带动自动清洗螺旋扭带可靠地自转。
dict.yoduao.com
2.The key lies in producing enough great driving force of natural circulation at reasonable heating temperature difference to make twisted tape self-rotate reliably in heat transfer tubes.
自然循环自动清洗式蒸发器是解决蒸发器结垢问题的理想方案，其关键是能否在合理的加热温差下产生足够大的自然循环推动力，足以带动自动清洗螺旋扭带可靠地自转。
dict.yoduao.com