Laboratory experiments on interfacial heat and gas exchange promoted by surface cooling: novel simultaneous thermal imaging and optical oxygen-concentration measurement
表面冷却促进界面热和气体交换的实验室实验:新型同步热成像和光学氧浓度测量
基本信息
- 批准号:327259972
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2017
- 资助国家:德国
- 起止时间:2016-12-31 至 2022-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
To be able to properly model the global cycling of carbon (and thus the global heat budget), detailed knowledge is needed on the amount of greenhouse gases absorbed or released by large bodies of water. At present, most models used to estimate gas transfer across the air-water interface only consider wind-shear and do not take buoyancy into account, which is a major contributor at low to moderate wind speeds. To improve the accuracy of the predictions, a detailed study of buoyancy-driven gas transfer in deep waters is necessary. As the interfacial mass transfer of low to moderate soluble gases (e.g. carbon dioxide, oxygen, methane) is characterized by an extremely thin gas concentration boundary layer, elucidating the physical mechanisms of the process is immensely difficult. Despite advanced development in optical measurement techniques, detailed simultaneous mappings of the highly dynamic temperature and gas concentration distributions promoted by buoyant-convection under well-controlled laboratory conditions have not been reported yet. We therefore propose to investigate the heat and gas transfer process driven by a buoyant-convective instability triggered by surface cooling through non-intrusive (optical) and simultaneous measurements of gas (oxygen) concentration and temperature fields (i) at the water surface and (ii) in a vertical plane on the liquid side. A complete lifetime-based laser induced fluorescence system suitable for resolving the oxygen dynamics including in the diffusive sublayer will be developed. To capture the distribution of the thermal structures at the surface, a high-precision infrared camera will be used, while an intensity-based LIF-thermometry system will be employed to obtain 2D thermal fields within the water column. The results will provide unprecedented experimental data in the form of synoptic two-dimensional thermal and gas concentration mappings under buoyant-convectively driven flow conditions in a relatively deep water body. The correlation between the thermal and gas-saturated plumes will be studied and their geometrical characteristics both at the water surface and in the water column will be explored and related to the heat and gas fluxes. A series of gas transfer velocity (k) measurements over a wide range of temperature differences between the bulk of the air and of the water will be carried out allowing k to be related to the bulk Rayleigh number and compared with k obtained from our new detailed simultaneous measurements. In addition, to provide information on the flow-field, particle image velocimetry (PIV) measurements will also be carried out for selected cases, which mainly focus on providing an overall(bulk)-view.
为了能够正确地模拟全球碳循环(以及全球热量收支),需要对大型水体吸收或释放的温室气体量有详细的了解。目前,大多数用于估算空气-水界面气体传输的模型只考虑了风切变,而没有考虑浮力,而浮力是低至中等风速下的主要因素。为了提高预测的准确性,有必要对深水中浮力驱动的气体传输进行详细研究。由于低至中等可溶性气体(如二氧化碳、氧气、甲烷)的界面传质具有极薄的气体浓度边界层,阐明该过程的物理机制是非常困难的。尽管光学测量技术有了先进的发展,但在控制良好的实验室条件下,浮力对流促进的高动态温度和气体浓度分布的详细同时映射尚未报道。因此,我们建议通过非侵入式(光学)和同时测量气体(氧气)浓度和温度场(i)在水面和(ii)在垂直平面上的液体侧)来研究由表面冷却引发的浮力对流不稳定性驱动的热量和气体传递过程。一个完整的基于寿命的激光诱导荧光系统适用于解决氧动力学包括扩散亚层。为了捕捉地表热结构的分布,将使用高精度红外摄像机,而基于强度的liff测温系统将用于获取水柱内的二维热场。结果将提供前所未有的实验数据,在相对较深的水体中,在浮力对流驱动的流动条件下,以天气二维热和气体浓度映射的形式。将研究热羽流和饱和气体羽流之间的相互关系,探索其在水面和水柱中的几何特征,并将其与热通量和气体通量联系起来。一系列的气体传递速度(k)测量将在很大范围内的空气和水之间的温差进行,使k与体积瑞利数相关,并与我们新的详细的同时测量得到的k进行比较。此外,为了提供有关流场的信息,还将对选定的情况进行粒子图像测速(PIV)测量,主要侧重于提供总体(大块)视图。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Dr.-Ing. Herlina Herlina其他文献
Dr.-Ing. Herlina Herlina的其他文献
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{{ truncateString('Dr.-Ing. Herlina Herlina', 18)}}的其他基金
Direct numerical simulation of gas transfer through the air-water interface in a turbulent flow environment
湍流环境中气体通过空气-水界面传递的直接数值模拟
- 批准号:
53900148 - 财政年份:2007
- 资助金额:
-- - 项目类别:
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