Experimental Study of Boiling Heat Transfer in Pebble Beds
Spherical fuel element nuclear reactor promises well due to its remarkable superiority. In the core of the reactor, it is actually porous media composed of spherical fuel element. The boiling heat transfer in the porous media exerts significant influences on the reactor’s efficiency and safety. An experiment setup was designed and the boiling heat transfer in the porous media composed of spheres of regular distribution was investigated. Four kinds of spheres with different diameters (5mm, 6mm, 7mm and 8mm) were used for the establishment of the different test sections. The greater particle diameter leads to a lower heat transfer coefficient, and results in a higher wall superheat of original nucleation boiling. The variation of heat transfer coefficient can be divided into three areas according to the two-phase flow pattern and void fraction. A correlation of heat transfer coefficient is proposed in form of Nu=f(ε,Bo,Rel,Prl ) with a mean relative deviation of ± 16％.
Boiling Heat transfer Pebble bed Porous media
Zhang Xiaojie Bai Bofeng
State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University Xi’an 710049, China
国际会议
上海
英文
1115-1126
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）