期刊论文

中文

热科学与技术

1671-8097

2006

5

3

227-230

10.13738/j.issn.1671-8097.2006.03.008

国家九五重点推广计划项目（96050403A） 湖南省教育厅资助项目（03C596）

本校为其他机构

液-固流态化传热强化的机理尚未完全清楚,已有文献对流态化粒子的粒度与传热系数的影响关系有较大分歧.从传热强化角度对水-沙流态化自动清洗的运行参数进行优化试验研究,得到的结果是:沙子粒度不是愈细愈好,而是Dp 2mm(8目)左右为好;粒子体积分数以2.4%比较好;流速在0.2～0.28 m/s(Re为6 000～9 000)较好.虽然粒子体积分数低,但是在优化条件下的流态化传热强化幅度几乎可以达到一倍左右,并且阻力又很低.

The mechanism of heat transfer enhancement of liquid-solid fluidization is not clear yet. There are many different views on the relationship between the particles size and heat transfer coefficient in the present documents. From the point view of heat transfer enhancement, the optimum experimental study of operation parameters was studied. Results indicate that heat transfer coefficient is not always increased when the particle size is decreased. The size of Dp 8mm is the best. The optimal volume density of particles is 2. 4%. The optimal range...