多孔结构毛细芯蒸发器传热特性的实验研究

Experimental Investigation on Heat Transfer Characteristics for Capillary Wick Evaporators

本文针对不同压力条件下不同换热表面结构的毛细结构蒸发器气（？）液相变传热特性进行了实验研究。选取微槽道结构和烧结丝网结构的换热表面分别在蒸发压力为0.86×10~5 Pa、0.91×10~5 Pa、0 96×10~5 Pa、1.0×10~5 Pa、1.5×10~5 Pa、2.0×10~5 Pa条件下进行了传热特性研究并对其实验结果进行对比,结果表明,压力对换热系数有重要的影响,当压力范围为0.86×10~5～1.0×10~5 Pa时,在过热度相同的条件下,随着压力的增加,换热系数呈上升趋势;在较大压力的条件下,换热系数随着过热度的增加呈先升后降的趋势。

Heat transfer characteristics for the different heat transfer surface structure at the different pressure conditions were investigated.The operational pressures in this study was in the range of 0.86×10~5～2.0×10~5 Pa,and heat transfer characteristics of the micro-channel structure and sintered screen structure were experimentally studied and compared.The experimental results showed that the operational pressure has an significantly effect on heat transfer coefficient.Heat transfer coefficient improved with the increase pressure in the range of 0.86×10~5～1.0×10~5 Pa at the same superheat condition.At the higher operational pressure,heat transfer coefficient first improved with the increase of superheat then dropped after reaching a certain value.