The local solid flow structure of a bubbling fluidized bed of sand particles was investigated m three different columns to characterize the properties of clusters. The experiments were performed using a reflective opt...The local solid flow structure of a bubbling fluidized bed of sand particles was investigated m three different columns to characterize the properties of clusters. The experiments were performed using a reflective optical fiber probe. The variations in size, velocity, and void fraction of the clusters due to changes in the superficial gas velocity, particle size, and radial positions were studied. The results indicate that the velocity of the clusters remained unchanged while their size increased as the column diameter increased. In addition, the radial profile of the clusters＇ velocity did not depend on the radial position. The results indicate that larger particles form larger clusters, which move slower.展开更多
We propose and demonstrate a novel single fiber optical tweezer based on a graded-index multimode fiber（GIMMF）, which works with a free length GIMMF（〉30 cm）. We achieve a three-dimensional stable trap of yeast ce...We propose and demonstrate a novel single fiber optical tweezer based on a graded-index multimode fiber（GIMMF）, which works with a free length GIMMF（〉30 cm）. We achieve a three-dimensional stable trap of yeast cells by using the GIMMF optical tweezers. Compared with the single-mode fiber optical tweezers,the GIMMF optical tweezers possess large optical trapping forces. Owing to the freedom of the GIMMF length,the fabrication of the GIMMF optical tweezers is simple, repeatable, and highly efficient. The GIMMF tweezers have the penitential to become a new member of the single fiber optical tweezers family and have a wide range of applications in the medical and biological cytology fields.展开更多
文摘The local solid flow structure of a bubbling fluidized bed of sand particles was investigated m three different columns to characterize the properties of clusters. The experiments were performed using a reflective optical fiber probe. The variations in size, velocity, and void fraction of the clusters due to changes in the superficial gas velocity, particle size, and radial positions were studied. The results indicate that the velocity of the clusters remained unchanged while their size increased as the column diameter increased. In addition, the radial profile of the clusters＇ velocity did not depend on the radial position. The results indicate that larger particles form larger clusters, which move slower.
基金supported by the National Natural Science Foundation of China(Nos.61227013,61377085,11574061,61405043,and 61675053)the 111 Project(No.B13015)+1 种基金the Postdoctoral Science Foundation Fund of China(Nos.2015T80322,2014M550181,and2014M551217)the Fundamental Research Funds for the Harbin Engineering University of China
文摘We propose and demonstrate a novel single fiber optical tweezer based on a graded-index multimode fiber（GIMMF）, which works with a free length GIMMF（〉30 cm）. We achieve a three-dimensional stable trap of yeast cells by using the GIMMF optical tweezers. Compared with the single-mode fiber optical tweezers,the GIMMF optical tweezers possess large optical trapping forces. Owing to the freedom of the GIMMF length,the fabrication of the GIMMF optical tweezers is simple, repeatable, and highly efficient. The GIMMF tweezers have the penitential to become a new member of the single fiber optical tweezers family and have a wide range of applications in the medical and biological cytology fields.
