-
-
摘要
超临界流体广泛应用于工程技术领域, 其流动传热特性对工程设计具有重要意义, 但是, 由于超临界流体的物理微观和宏观行为的机理尚不清晰, 所以其异常的流动传热特性并未得到很好的解决. 普遍认为超临界流体在分子尺度上可分为类气和类液两种不同的特性, 直到最近通过实验在宏观上监测到超临界水类液和类气之间的转变, 且这一过程与拟沸腾理论一致, 使得问题逐渐变得清晰. 本文基于拟沸腾理论对超临界CO2异常流动传热行为进行了研究, 在假设类液和类气转换过程不均匀的情况下, 从经典的量纲分析和亚临界过冷沸腾理论模型出发, 提出了一个适用于超临界流体拟沸腾换热过程的分析方法. 通过引入表征类气膜生长速度与流体主流平均流速之比π = (qw·ρl)/(G·Δi·ρg)和表征近壁区类气膜温度梯度π13 = (qw·βpc·di)/λg两个无量纲数, 来表征拟沸腾如何导致传热恶化, 解释了超临界CO2竖直向上加热流动过程中的异常换热特性, 即较大的类气膜生长速度使近壁区快速聚集了较多的高温流体, 而较大的类气膜温度梯度使类气膜覆盖在壁面. 当核心的冷类液不能充分润湿热壁面时, 传热恶化. 新无量纲数较好的诠释了超临界流体拟沸腾诱导传热恶化机制, 为超临界拟沸腾传热研究提供了理论依据.-
关键词:
- 2')" href="javascript:void(0);"> 超临界CO2 /
- 拟沸腾 /
- 传热恶化 /
- 量纲分析
Abstract
Supercritical fluids are widely used in engineering technology, and the flow and heat transfer characteristics are very important for engineering design. However, due to the fact that the physical micro- and macroscopic behaviors of supercritical fluids are still open, neither the heat transfer mechanism nor the flow mechanism of supercritical fluids has been well revealed. It is widely believed that liquid-like (LL) and gas-like (GL) supercritical fluid are two phases distinguishable on a molecular scale. Only recently, has it become clear that the macroscopic transition from LL to GL supercritical state, when crossing the Widomline, is successfully detected in experiment, and explained based on the pseudo-boiling concept. In this paper, the abnormal flow and heat transfer behavior of supercritical CO2 are studied based on the pseudo-boiling theory. On the assumption that the transition from LL to GL is heterogeneous, an analysis method for pseudo-boiling heat transfer is developed from classical dimensional analysis and subcritical subcooled boiling theory of models. To analyze the pseudo-boiling resulting in heat transfer deterioration process of supercritical fluid, two dimensionless numbers which are π = (qw·ρl)/(G·Δi·ρg) and π13 = (qw·βpc·di)/λg are proposed to explain the anomalous heat transfer characteristics in vertical upward heating flow. The former π reflects the rate of conversion between gas-like and liquid-like fluid. The larger gas-like conversion rate promotes the rapid production of more high-temperature fluid in the near-wall region, and the latter π13 characterizes the temperature gradient of gas-like film near the wall: the larger temperature gradient causes the gas film to cover the wall surface. The heat transfer deterioration may occur when the cooler liquid-like fluid of the core region cannot rewet the hot wall adequately. The new dimensionless numbers can successfully explain the heat transfer deterioration of supercritical fluid flow induced by pseudo-boiling. Our work paves the way to understanding the heat transfer and flow for supercritical fluids which establishes a relation among the internal flow, heat transfer field characteristics, boundary conditions and physical properties based on the pseudo-boiling theory preliminarily. The results of dimensional analysis can be applied to the similarity theory analysis of different fluids, which is of significance for promoting the theoretical research of supercritical fluid heat transfer on the basis of pseudo-boiling concept.-
Keywords:
- supercritical carbon dioxide /
- pseudo-boiling /
- heat transfer deterioration /
- dimensional analysis
作者及机构信息
Authors and contacts
文章全文 : translate this paragraph
参考文献
[1] Tsai W C, Wang Y 2019 Prog. Polym. Sci. 98 101161
Google Scholar
[2] Knez Z, Markocic E 2014 Energy 77 235
Google Scholar
[3] Pizzarelli M 2018 Int. Commun. Heat Mass Transf. 95 132
Google Scholar
[4] Wang H, Leungc L K H, Wang W S, Bi Q C 2018 Appl. Therm. Eng. 142 573
Google Scholar
[5] Knapp K K, Sabersky R H 1966 Int. J. Heat Mass Transf. 9 41
Google Scholar
[6] Ackerman J W 1970 J. of Heat Transfer 92 490
Google Scholar
[7] Stewart E, Stewart P, Watson A 1973 Int. J. Heat Mass Transfer 16 257
Google Scholar
[8] Ambrosini W 2007 Nucl. Eng. Des. 237 1164
Google Scholar
[9] Ma T, Wang S H 2011 AIP Advances 1 042101
Google Scholar
[10] Simeoni G G, Bryk T, Gorelli F A, Krisch M, Ruocco G, Santoro M, Scopigno T 2010 Nat. Phys. 6 503
Google Scholar
[11] Ha M Y, Yoon T J, Tlusty T, Jho Y, Lee W B 2018 J. Phys. Chem. Lett. 9 1734
Google Scholar
[12] Banuti D T 2015 J. Supercrit. Fluids 98 12
Google Scholar
[13] Maxim F, Contescu C, Boillat P, Niceno B, Karalis K, Testino A, Ludwig C 2019 Nat. Commun. 10 1
Google Scholar
[14] Zhu B G, Xu J L, Wu X M, Xie J, Li M J 2019 J Int. J. Therm. Sci. 136 254
Google Scholar
[15] Xu J L, Zhang H S, Zhu B G, Xie J 2020 Sol. Energy 195 27
Google Scholar
[16] 张海松, 朱鑫杰, 朱兵国, 徐进良, 刘欢 2020 物理学报 6 064401
Google Scholar
Zhang H S, Zhu X J, Zhu B G, Xu J L, Liu H 2020 Acta Phys. Sin. 6 064401
Google Scholar
[17] Yildiz S, Groeneveld D C 2014 Int. Commun. Heat Mass Transf. 54 27
Google Scholar
[18] 张思宇 2015 博士学位论文 (上海: 上海交通大学)
Zhang S Y 2015 Ph. D. Dissertation(Shanghai: Shanghai Jiaotong University) (in Chinese)
[19] Kang K H, Chang S H 2009 Int. J. Heat Mass Transfer 52 4946
Google Scholar
[20] Yamashita T, Yoshida S, Mori H, Morooka S, Komita H 2003 GENES4/ANP2003, Kyoto, Japan., Sep. 15–19, 2003 1119
[21] Lei X L, Li H X, Zhang W Q, Dinh N T, Guo Y M, Yu S Q 2017 Appl. Therm. Eng. 113 609
Google Scholar
[22] Shen Z, Yang D, Chen G M, Xiao F 2014 Int. J. Heat Mass Transfer 68 669
Google Scholar
[23] Buckingham E 1914 Phys. Rev. 4 345
[24] 罗峰, 胥蕊娜, 姜培学 2014 工程热物理学报 6 1170
Luo F, Xu R N, Jiang P X 2014 J. Eng. Thermophysics 6 1170
[25] 刘生晖, 黄彦平, 刘光旭, 王俊峰, 王金宇 2019 核动力工程 40 18
Google Scholar
Liu S H, Huang Y P, Liu G X, Wang J F, Wang J Y 2019 Nucl. Power Engineering 40 18
Google Scholar
[26] 廖长江, 李会雄 2015 工程热物理学报 1 111
Liao C J, Li H X 2015 J. Eng. Thermophysics 1 111
施引文献
-
图 1 不同压力下的SCF穿越WL的物性变化
Fig. 1. The physical properties of SCF crossing WL under different pressures.
下载:
全尺寸图片
幻灯片
图 2 不同压力下的CO2密度随温度变化分布
Fig. 2. Density of CO2 varies with temperature under different pressures.
下载:
全尺寸图片
幻灯片
图 3 超临界CO2拟沸腾相变焓Δi定义和跨越温差ΔT
Fig. 3. Defining pseudo-boiling enthalpy Δi and temperature span ΔT of S-CO2 during pseudo-boiling.
下载:
全尺寸图片
幻灯片
图 4 不同参数下CO2内壁温随焓值变化分布
Fig. 4. The inner wall temperature distribution of S-CO2 with enthalpy under varies parameters.
下载:
全尺寸图片
幻灯片
图 5 亚临界DNB (黑色)和超临界压力下传热恶化壁温(红色)分布对比
Fig. 5. Comparison of wall temperature distribution subcritical DNB (black) and supercritical heat transfer deterioration (red).
下载:
全尺寸图片
幻灯片
图 6 不同超临界流体在正常传热和恶化传热过程中的Twi/Tpc和Tb/Tpc随焓值变化分布
Fig. 6. Distribution of Twi/Tpc and Tb/Tpc with enthalpy during normal heat transfer (NHT) and heat transfer deterioration(HTD)of different supercritical fluids.
下载:
全尺寸图片
幻灯片
图 7 正常和恶化传热下类气膜内的温度梯度和内壁温随焓值分布
Fig. 7. Distribution of temperature gradients and inner wall temperature with enthalpy in gas-like film under normal heat transfer(NHT) and heat transfer deterioration(HTD).
下载:
全尺寸图片
幻灯片
图 8 正常传热和恶化传热下的新无量纲数π、内壁温Twi和换热系数h随焓值分布
Fig. 8. Distribution of the new dimensionless numberπ, inner wall temperature Twi and heat transfer coefficient h with enthalpy under normal heat transfer (NHT) and deteriorated heat transfer (HTD).
下载:
全尺寸图片
幻灯片
图 9 新无量纲数作用超临界流体拟沸腾传热恶化机制
Fig. 9. New dimensionless action on number deterioration of pseudo-boiling heat transfer mechanism.
下载:
全尺寸图片
幻灯片
深圳SEO优化公司武安网站seo优化排名网站优化过于重视首页网站怎样优化成快照江阴营销网站设计优化价格网站里关键词优化位置前50遂宁网站seo优化公司长治网站目标关键词优化湖北seo网站优化方法南通网站内容优化深圳网站seo优化公司天门外包网站优化通州专业网站优化外包四川正规的网站关键词优化眉山网站优化公司金水区网站推广优化优化网站标题的解释密山网站优化电话整个网站优化排名开封网站优化推广公司温州网站优化排名株洲百度网站优化哪家好怎么优化网站84云刂速刂捷网站建设网站排名整站优化公司黄山seo网站优化报价关于优化医疗网站的建议网站里关键词优化位置前50山西网站优化什么价格湖州网站seo优化网站公司广水市优化网站建设铜川网站优化案例歼20紧急升空逼退外机英媒称团队夜以继日筹划王妃复出草木蔓发 春山在望成都发生巨响 当地回应60岁老人炒菠菜未焯水致肾病恶化男子涉嫌走私被判11年却一天牢没坐劳斯莱斯右转逼停直行车网传落水者说“没让你救”系谣言广东通报13岁男孩性侵女童不予立案贵州小伙回应在美国卖三蹦子火了淀粉肠小王子日销售额涨超10倍有个姐真把千机伞做出来了近3万元金手镯仅含足金十克呼北高速交通事故已致14人死亡杨洋拄拐现身医院国产伟哥去年销售近13亿男子给前妻转账 现任妻子起诉要回新基金只募集到26元还是员工自购男孩疑遭霸凌 家长讨说法被踢出群充个话费竟沦为间接洗钱工具新的一天从800个哈欠开始单亲妈妈陷入热恋 14岁儿子报警#春分立蛋大挑战#中国投资客涌入日本东京买房两大学生合买彩票中奖一人不认账新加坡主帅：唯一目标击败中国队月嫂回应掌掴婴儿是在赶虫子19岁小伙救下5人后溺亡 多方发声清明节放假3天调休1天张家界的山上“长”满了韩国人？开封王婆为何火了主播靠辱骂母亲走红被批捕封号代拍被何赛飞拿着魔杖追着打阿根廷将发行1万与2万面值的纸币库克现身上海为江西彩礼“减负”的“试婚人”因自嘲式简历走红的教授更新简介殡仪馆花卉高于市场价3倍还重复用网友称在豆瓣酱里吃出老鼠头315晚会后胖东来又人满为患了网友建议重庆地铁不准乘客携带菜筐特朗普谈“凯特王妃P图照”罗斯否认插足凯特王妃婚姻青海通报栏杆断裂小学生跌落住进ICU恒大被罚41.75亿到底怎么缴湖南一县政协主席疑涉刑案被控制茶百道就改标签日期致歉王树国3次鞠躬告别西交大师生张立群任西安交通大学校长杨倩无缘巴黎奥运
-
[1] Tsai W C, Wang Y 2019 Prog. Polym. Sci. 98 101161
Google Scholar
[2] Knez Z, Markocic E 2014 Energy 77 235
Google Scholar
[3] Pizzarelli M 2018 Int. Commun. Heat Mass Transf. 95 132
Google Scholar
[4] Wang H, Leungc L K H, Wang W S, Bi Q C 2018 Appl. Therm. Eng. 142 573
Google Scholar
[5] Knapp K K, Sabersky R H 1966 Int. J. Heat Mass Transf. 9 41
Google Scholar
[6] Ackerman J W 1970 J. of Heat Transfer 92 490
Google Scholar
[7] Stewart E, Stewart P, Watson A 1973 Int. J. Heat Mass Transfer 16 257
Google Scholar
[8] Ambrosini W 2007 Nucl. Eng. Des. 237 1164
Google Scholar
[9] Ma T, Wang S H 2011 AIP Advances 1 042101
Google Scholar
[10] Simeoni G G, Bryk T, Gorelli F A, Krisch M, Ruocco G, Santoro M, Scopigno T 2010 Nat. Phys. 6 503
Google Scholar
[11] Ha M Y, Yoon T J, Tlusty T, Jho Y, Lee W B 2018 J. Phys. Chem. Lett. 9 1734
Google Scholar
[12] Banuti D T 2015 J. Supercrit. Fluids 98 12
Google Scholar
[13] Maxim F, Contescu C, Boillat P, Niceno B, Karalis K, Testino A, Ludwig C 2019 Nat. Commun. 10 1
Google Scholar
[14] Zhu B G, Xu J L, Wu X M, Xie J, Li M J 2019 J Int. J. Therm. Sci. 136 254
Google Scholar
[15] Xu J L, Zhang H S, Zhu B G, Xie J 2020 Sol. Energy 195 27
Google Scholar
[16] 张海松, 朱鑫杰, 朱兵国, 徐进良, 刘欢 2020 物理学报 6 064401
Google Scholar
Zhang H S, Zhu X J, Zhu B G, Xu J L, Liu H 2020 Acta Phys. Sin. 6 064401
Google Scholar
[17] Yildiz S, Groeneveld D C 2014 Int. Commun. Heat Mass Transf. 54 27
Google Scholar
[18] 张思宇 2015 博士学位论文 (上海: 上海交通大学)
Zhang S Y 2015 Ph. D. Dissertation(Shanghai: Shanghai Jiaotong University) (in Chinese)
[19] Kang K H, Chang S H 2009 Int. J. Heat Mass Transfer 52 4946
Google Scholar
[20] Yamashita T, Yoshida S, Mori H, Morooka S, Komita H 2003 GENES4/ANP2003, Kyoto, Japan., Sep. 15–19, 2003 1119
[21] Lei X L, Li H X, Zhang W Q, Dinh N T, Guo Y M, Yu S Q 2017 Appl. Therm. Eng. 113 609
Google Scholar
[22] Shen Z, Yang D, Chen G M, Xiao F 2014 Int. J. Heat Mass Transfer 68 669
Google Scholar
[23] Buckingham E 1914 Phys. Rev. 4 345
[24] 罗峰, 胥蕊娜, 姜培学 2014 工程热物理学报 6 1170
Luo F, Xu R N, Jiang P X 2014 J. Eng. Thermophysics 6 1170
[25] 刘生晖, 黄彦平, 刘光旭, 王俊峰, 王金宇 2019 核动力工程 40 18
Google Scholar
Liu S H, Huang Y P, Liu G X, Wang J F, Wang J Y 2019 Nucl. Power Engineering 40 18
Google Scholar
[26] 廖长江, 李会雄 2015 工程热物理学报 1 111
Liao C J, Li H X 2015 J. Eng. Thermophysics 1 111
下载:
全尺寸图片
幻灯片
目录
- 第70卷，第4期 - 2021年02月20日
计量
- 文章访问数: 6662
- PDF下载量: 123
- 被引次数: 0
