Kinetic granular temperature and its measurement using speckle visibility spectroscopy--颗粒学报PARTICUOLOGY

Yang, H., Zhu, Y., Li, R., & Sun, Q. (2020). Kinetic granular temperature and its measurement using speckle visibility spectroscopy. Particuology, 48, 160-169. https://doi.org/10.1016/j.partic.2018.07.011

Kinetic granular temperature and its measurement using speckle visibility spectroscopy

Hui Yang ^{a b}, Yonghai Zhu ^a, Ran Li ^a, Qicheng Sun ^c *

a School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
b Shanghai Key Laboratory of Modern Optical Systems, University of Shanghai for Science and Technology, Shanghai 200093, China
c State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China

10.1016/j.partic.2018.07.011

Volume 48, February 2020, Pages 160-169

Received 28 May 2018, Revised 26 July 2018, Accepted 28 July 2018, Available online 2 February 2019, Version of Record 27 January 2020.

E-mail: qcsun@tsinghua.edu.cn

Highlights

• Improved speckle visibility spectroscopy (SVS) has a high spatio-temporal resolution.

• SVS can effectively identify the random motion of grains.

• Kinetic granular temperature is valid in various flow regimes.

Abstract

The occurrence of a mesoscopic scale in granular materials leads to a sharp increase in the number of interaction processes at both intra- and inter-scale levels. The mesoscopic scale is the main source of the complex macroscopic properties of granular materials. The quantification of mesoscopic disordered movements is often referred to as granular temperature. In this paper, we first introduce the physical meaning of the original granular temperature of a kinetic nature, T_k, and then briefly summarize the advances made over the past few decades. Our research group has focused on T_k measurement using speckle visibility spectroscopy. The principle of this technique and the instruments developed in our research group are briefly introduced. Our work shows great promise in the measurement of kinetic granular temperature. Finally, a summary of granular temperature and some recent developments in speckle visibility spectroscopy measurements are presented.

Graphical abstract

Keywords

Granular flow; Mesoscopic process; Granular temperature; Speckle visibility spectroscopy

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