摘要
本文对金属丝制大空隙率（ε＞９５％）多孔体的管内换热，流动特性和流型进行了系统的实验研究。揭示出多孔体内流体在弥散效应作用下的流型以及径向位移与螺旋流相叠加的复杂三维流动并进而发展为湍流的状况。结果表明，这种多孔体可以显著强化换热，首次使换热系数增加的幅度等于或高于阻力系数增加的幅度，成为迄今报导的最有效的管内强化换热新技术。此项技术已在工业上推广应用。
Flow visualization, pressure drop and heat transfer characteristics in tubes high porosity (ε> 95%) porous inserts were investigated experimentally. The porous inserts were constructed of metal wire. The flow patterns generated by the effects of dispersion, and the complex three dimensional flow behavior, which compounded radial displacement with swirl flow and developed into turbulent flow, were depicted. It is shown that porous inserts significantly enhance convective heat transfer. The increase in heat transfer coefficient is equal to or great than the increase in fraction factor, for the first time. This kind of Porous insert becomes the most effective augmentating technique for convective heat transfer in tubes reported up to date. The technique has been used in industry.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
1995年第3期344-348,共5页
Journal of Engineering Thermophysics
