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自然吸入过程中润湿前沿处温度峰值的出现。

Occurrence of temperature spikes at a wetting front during spontaneous imbibition.

机构信息

Department of Earth Sciences, Utrecht University, Utrecht, The Netherlands.

Institute of Aerospace Thermodynamics, Stuttgart University, Stuttgart, Germany.

出版信息

Sci Rep. 2017 Aug 4;7(1):7268. doi: 10.1038/s41598-017-07528-7.

DOI:10.1038/s41598-017-07528-7
PMID:28779111
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5544723/
Abstract

It is reported that temperature rises at wetting front during water infiltration into soil. The temperature goes back to the background value after passage of water front. Different explanations have been provided for source of energy causing temperature spike. Some have contributed it to heat of condensation released due to condensation of vapor on "dry" solid surface. Some other stated that the heat of wetting or heat of adsorption is responsible for the temperature rise. In this research, we revisited this issue. First, we provide a comprehensive review about occurrence of temperature spike at a wetting front. Then, we report about experiments we performed on the rise of water in dry paper. Using infrared and optical imaging techniques, we could monitor temperature changes in time and space. For all samples maximum temperature rise occurred at the wetting front. The magnitude of temperature spike depended on paper material, thickness, and liquid composition. It was larger for cellulose-fiber-based paper than for plastic-based paper. For a given paper type, thicker samples showed a larger temperature spike. Adding salt to the water caused reduction of temperature spike. It was concluded that replacement of air-solid interface with water-solid interface releases energy, which causes temperature rise.

摘要

据报道，水在土壤中渗透时，浸润前沿的温度会升高。水流过前沿后，温度会回到背景值。对于导致温度飙升的能量来源，已经有不同的解释。有人认为这是由于蒸汽在“干燥”固体表面冷凝时释放的冷凝热所致。也有人认为是润湿热或吸附热导致了温度的升高。在这项研究中，我们重新探讨了这个问题。首先，我们对浸润前沿处出现温度峰值的情况进行了全面回顾。然后，我们报告了我们在干燥纸张中水分上升方面所做的实验。使用红外和光学成像技术，我们可以实时监测温度的时空变化。对于所有样品，最大温度上升发生在浸润前沿。温度峰值的大小取决于纸张材料、厚度和液体成分。基于纤维素纤维的纸张比基于塑料的纸张温度峰值更大。对于给定的纸张类型，较厚的样品显示出更大的温度峰值。向水中加盐会导致温度峰值降低。结论认为，空气-固界面被水-固界面取代会释放能量，导致温度升高。

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本文引用的文献

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Heat release at the wetting front during capillary filling of cellulosic micro-substrates.纤维素微基片毛细填充时润湿前沿的热释放。
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2
Temperature Fluctuations Accompanying Water Movement through Porous Media.温度波动伴随水在多孔介质中的运动。
Science. 1960 May 6;131(3410):1370-1. doi: 10.1126/science.131.3410.1370.