摘要
开发并组装了可变倾角的三相流(V/L/S)闭式重力热管(THPCT)。实验所用的工作流体为水,固相工质分别为碳化硅(SiC)、聚甲醛(POM)和玻璃珠颗粒,考察了倾角(0°~30°)、颗粒类型以及加热功率(100~300 W)对THPCT传热性能的影响。研究结果指出,SiC和POM颗粒在4个倾斜角度下均能够明显改善重力热管的传热性能,总热阻减少率最大分别为25.7%和39.4%,所对应的条件均为Q=100 W和θ=30°;而玻璃珠颗粒恶化了重力热管的传热。TPCT和THPCT的总热阻均随倾角的增加而波动;加热功率的增加导致总热阻减小,但其程度不断降低。蒸发段和冷凝段的对流传热系数也均随着倾角的增加而波动;加热功率对冷凝段传热的影响比蒸发段更为显著。在大多数情况下,碳化硅或聚甲醛颗粒可以强化蒸发段和冷凝段的传热;玻璃珠颗粒的加入有利于蒸发段的传热,但基本上不利于冷凝段。TPCT和THPCT蒸发段的传热阻力均明显小于冷凝段。加热功率增大,各倾角下蒸发段和冷凝段的热阻比率减小,但其程度不断降低。热阻比率一般随倾角的增加而波动,但不同倾角之间的差异随加热功率的增大而减小。碳化硅和聚甲醛颗粒的加入降低了热阻比率,而玻璃珠颗粒的加入增加了热阻比率。绘制了总热阻随操作参数变化的三维等高线图。
A three-phase(V/L/S)closed thermosyphon(THPCT)with variable inclination angles is developed and assembled in this study.The effect of inclination angle(0°~30°),particle type and heat-ing power(100~300 W)on the thermal performance of the THPCT is investigated by using water as the liquid working medium,and silicon carbide(SiC)particle,polyformaldehyde(POM)particle and glass bead as the solid working media,respectively.Results show that both SiC and POM particles can obvi-ously improve the thermal performance of the thermosyphon at the four inclination angles,and the maxi-mum overall thermal resistance reduction rate are 25.7%and 39.4%respectively,at Q=100 W and θ=30°;however,the glass beads deteriorate the heat transfer performance of the thermosyphon.The overall thermal resistances of both TPCT and THPCT fluctuate with the increase in inclination angle,and de-crease with the increase in heating power,but the decreasing degree becomes smaller and smaller.The convective heat transfer coefficients of both the evaporation section and condensation section also fluctuate with the increase in inclination angle.The heat transfer of the condensation section varying with heating power is more significant compared with the evaporation section.In most cases,SiC or POM particles can improve the heat transfer of the evaporation section and condensation section;the glass beads can greatly improve the heat transfer of the evaporation section,but generally deteriorate the heat transfer of the con-densation section.The thermal resistance of the evaporation section is obviously smaller than that of the condensation section for both for the TPCT and THPCT.The ratio of the thermal resistance of the evapo-ration section to that of the condensation section decreases with the increase in heating power at four incli-nation angles,but the degree decreases.The thermal resistance ratio generally fluctuates with the in-crease in inclination angle,but the difference among different inclination angles decreases with the in-crease in heatin
作者
姜峰
林一鸣
马宇鑫
齐国鹏
李修伦
JIANG Feng;LIN Yiming;MA Yuxin;QI Guopeng;LI Xiulun(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;School of Biological and Environment Engineering,Tianjin Vocational Institute,Tianjin 300410,China;Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology,Tianjin 300350,China)
出处
《化学工业与工程》
CAS
CSCD
北大核心
2023年第5期64-75,共12页
Chemical Industry and Engineering
基金
化学工程国家重点实验室开放项目(SKL-CHE-18B03)
天津市科技支撑计划重点项目(2009ZCKFGX01900)。
关键词
倾角
颗粒类型
THPCT
传热过程强化
流化床换热
inclination angle
particle type
THPCT
heat transfer process enhancement
fluidized bed heat transfer
