• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >A theoretical and experimental study of typical heterogeneous ice nucleation process on auto windshield under nocturnal radiative cooling and subfreezing conditions
【24h】

A theoretical and experimental study of typical heterogeneous ice nucleation process on auto windshield under nocturnal radiative cooling and subfreezing conditions

机译：夜间辐射冷却和亚冻结条件下汽车挡风玻璃典型非均质冰成核过程的理论和实验研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In the present study, we theoretically and experimentally investigated a typical and practical heterogeneous ice nucleation process on auto windshield under nocturnal radiative cooling and subfreezing conditions. During the experiment, a general class A passenger car was placed outdoors in a subfreezing environment (i.e., 44.14 degrees N, 126.45 degrees E) during nights in January, with a purpose to produce a nocturnal radiative cooling condition for supercooling the windshield to trigger the ice nucleation. The results revealed a distinctive three-stage frosting process: (I) inhomogeneous occurrence of incipient ice nucleation; (II) small-sized ice crystals grew into large-sized ones primarily based on the incipient nucleation sites, together with a continual formation of new nucleation sites and a merging between large-sized and small-sized crystals; (Ill) large-sized ice crystals coalesced into large-scale groups, tending to make a full ice coverage. Unlike the classical three-period frosting process, the present study exhibited an absence of the drop-wise condensation but with a presence of dendritic crystals nearly parallel to the supercooled surface. Besides, the incipient ice nucleation was first initiated on the upper part of the windshield, which then propagated downward with a further heat loss of the windshield due to the continual nocturnal radiation. Meanwhile, the probable presence of surface roughness or contamination was much more likely to trigger an earlier initiation of incipient heterogeneous ice nucleation. Additionally, the arrival of saturation point, rather than the nominal supersaturation state (i.e., the condensation nucleation point), could be expected to approximately mark the initiation of icing under a practical engineering condition. Higher relative humidity tended to induce an earlier occurrence of ice nucleation and produce a larger surface coverage. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在本研究中，我们在理论上和实验上研究了夜间辐射冷却和亚冻结条件下汽车挡风玻璃上典型且实用的非均质冰成核过程。在实验过程中，一月份的夜间，一辆普通的A类乘用车被放置在室外处于亚冰冻的环境中（即，北纬44.14度，东经126.45度），目的是产生夜间辐射冷却条件，以使挡风玻璃过冷以触发风挡。冰成核。结果揭示了一个独特的三阶段结霜过程：（I）初始冰核的不均匀发生； （II）小型冰晶主要基于初始成核位点，并不断形成新的成核位点，并在大，小尺寸晶体之间融合而成长为大尺寸的冰晶； （病态）大冰晶聚结成大群，趋向于覆盖整个冰层。与经典的三期糖霜工艺不同，本研究显示不存在逐滴凝结，但存在与平行于过冷表面几乎平行的树枝状晶体。此外，初期的冰成核首先在挡风玻璃的上部开始，然后由于连续的夜间辐射而在挡风玻璃的进一步热损失的情况下向下传播。同时，表面粗糙或污染的可能存在更有可能触发较早开始的异质冰成核。另外，在实际工程条件下，可以预期饱和点的到达而不是标称过饱和状态（即凝结成核点）近似地标志着结冰的开始。较高的相对湿度趋向于引起冰核早发并产生较大的表面覆盖率。 （C）2019 Elsevier Ltd.保留所有权利。

著录项

  • 来源
  • 作者

    Du Xuzhi; Yang Zhigang; Jin Zheyan; Zhu Yuyu; Zhou Zhiwei;

  • 作者单位

    Tongji Univ, Shanghai Automot Wind Tunnel Ctr, Shanghai 201804, Peoples R China|Shanghai Key Lab Vehicle Aerodynam & Vehicle Ther, Shanghai 201804, Peoples R China;

    Tongji Univ, Shanghai Automot Wind Tunnel Ctr, Shanghai 201804, Peoples R China|Shanghai Key Lab Vehicle Aerodynam & Vehicle Ther, Shanghai 201804, Peoples R China|Beijing Aeronaut Sci & Technol Res Inst, Beijing 102211, Peoples R China;

    Tongji Univ, Shanghai Automot Wind Tunnel Ctr, Shanghai 201804, Peoples R China|Tongji Univ, Sch Aerosp Engn & Appl Mech, Shanghai 200092, Peoples R China;

    Tongji Univ, Shanghai Automot Wind Tunnel Ctr, Shanghai 201804, Peoples R China|Shanghai Key Lab Vehicle Aerodynam & Vehicle Ther, Shanghai 201804, Peoples R China;

    Tongji Univ, Shanghai Automot Wind Tunnel Ctr, Shanghai 201804, Peoples R China|Shanghai Key Lab Vehicle Aerodynam & Vehicle Ther, Shanghai 201804, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nocturnal radiative cooling; Subfreezing condition; Auto windshield; Ice nucleation; Three-stage frosting process; Saturation point;

    机译：夜间辐射冷却;低温冻结;自动挡风玻璃;冰核;三阶段磨砂工艺;饱和点;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号