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设计了2种分别由6根管子组成的不同管束排列在沸腾室中.实验以去离子水为介质,研究了常压及低于大气压下压力对光滑管束和烧结表面多孔管束核池沸腾传热性能的影响.实验结果表明,在真空条件下这2种管束的沸腾传热系数与在常压条件下一样随着压力值的升高而增大.在相同的操作参数条件下,与光滑管相比较,当压力值在10～100kPa之间变化时,烧结表面多孔管的传热系数提高了0.2～4倍.此外,实验数据还表明在真空条件下烧结表面多孔管及光滑管均存在管束效应.
Two kinds of tube bundles composed of six tubes were designed and arranged in the boiling chamber.In the experiment, deionized water was used as the medium to study the effects of pressure at normal pressure and subatmospheric pressure on the nucleate pool boiling pass Thermal performance.The experimental results show that the boiling heat transfer coefficients of the two tube bundles increase with the increase of the pressure under the same conditions under normal pressure and under the same operating conditions.Their smoothness Compared with the tube, the heat transfer coefficient of the porous tube on the sintered surface increased by 0.2 ~ 4 times when the pressure was varied from 10kPa to 100kPa.In addition, the experimental data also showed that both the sintered porous tube and the smooth tube were present under vacuum Tube bundle effect.