{"title":"Experimental studies on fluctuation properties of dust, turbulence and electric field during floating dust weather in Lanzhou","authors":"Tian-sheng Liu, Tian-Li Bo","doi":"10.1007/s10035-024-01481-9","DOIUrl":null,"url":null,"abstract":"<div><p>In this paper, real-time measurements of three-dimensional wind speed, electric field and dust concentration during the floating-dust event were carried out in Lanzhou. The scaling relationship of different physical quantities in spectral space and the effect of turbulent events on dust and heat transport are studied by spectral method and octant analysis method. Our results show that the logarithmic value of power spectrum of dust concentration, relative humidity (<i>RH</i>), streamwise and vertical wind speed (<i>u</i> and <i>w</i>) between 0.06 Hz and 0.435 Hz meets the linear relationship with the logarithmic value of frequency (<i>f</i>), and decreases with the logarithmic value of <i>f</i>. For different stages, in the frequency range from 0.06 Hz to 0.218 Hz, the slope of the <i>u</i> first increases and then decreases. The slope of dust concentration and <i>RH</i> did not change significantly in the development stage, but decreased in the decay stage. The slope of the temperature (<i>T</i>) first decreases and then increases. In the frequency range from 0.218 Hz to 0.435 Hz, the slope of <i>u</i> and <i>RH</i> first increase and then decrease. The slope of the dust concentration does not change significantly during the development stage and decreases in the decay stage. The slope of <i>w</i> first increases and then decreases. In the second stage, the contribution of ejection and sweep events to the turbulent motion increases. For dust and heat transport, the O<sub>5</sub> and O<sub>8</sub> have a larger number contribution. Although the number and intensity contribution ratio of all octants increased or decreased in the second and third stages, in terms of the intensity of a single event, the contribution of all octants to the dust and heat transport increased.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4000,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Granular Matter","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s10035-024-01481-9","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
In this paper, real-time measurements of three-dimensional wind speed, electric field and dust concentration during the floating-dust event were carried out in Lanzhou. The scaling relationship of different physical quantities in spectral space and the effect of turbulent events on dust and heat transport are studied by spectral method and octant analysis method. Our results show that the logarithmic value of power spectrum of dust concentration, relative humidity (RH), streamwise and vertical wind speed (u and w) between 0.06 Hz and 0.435 Hz meets the linear relationship with the logarithmic value of frequency (f), and decreases with the logarithmic value of f. For different stages, in the frequency range from 0.06 Hz to 0.218 Hz, the slope of the u first increases and then decreases. The slope of dust concentration and RH did not change significantly in the development stage, but decreased in the decay stage. The slope of the temperature (T) first decreases and then increases. In the frequency range from 0.218 Hz to 0.435 Hz, the slope of u and RH first increase and then decrease. The slope of the dust concentration does not change significantly during the development stage and decreases in the decay stage. The slope of w first increases and then decreases. In the second stage, the contribution of ejection and sweep events to the turbulent motion increases. For dust and heat transport, the O5 and O8 have a larger number contribution. Although the number and intensity contribution ratio of all octants increased or decreased in the second and third stages, in terms of the intensity of a single event, the contribution of all octants to the dust and heat transport increased.
期刊介绍：
Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science.
These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations.
>> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa.
The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.
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