Results 11 to 20 of about 527,112 (222)

Granular circulation in a cylindrical pan: simulations of reversing radial and tangential flows [PDF]

, 2006
Granular flows due to simultaneous vertical and horizontal excitations of a flat-bottomed cylindrical pan are investigated using event-driven molecular dynamics simulations.
B. D. Lubachevsky, D. Bideau, H. El hor, John J. Drozd, M. D. Shattuck, O. R. Walton, Oleh Baran, Peter H. Poole, Robert J. Martinuzzi   +8 more
core   +2 more sources

Reversing circulation patterns in a tropical estuary [PDF]

Journal of Geophysical Research: Oceans, 2003
A combination of current velocity and water density measurements was used to characterize the basic patterns of water exchange in the Gulf of Fonseca, a tropical estuary on the Pacific Ocean side of Central America. The measurements were obtained during spring and neap tides in March (dry season) and June (wet season) of 2001 and consisted of profiles ...
Valle-Levinson, Arnoldo, Bosley, Kathryn T.   +1 more
openaire   +5 more sources

Insight into dust control performance of a reverse circulation drill bit using multiphase flow simulation [PDF]

Engineering Applications of Computational Fluid Mechanics, 2022
A feature of reverse circulation pneumatic down-the-hole (DTH) hammer drilling system is its ability to reduce the emission of respirable dust which is known to be harmful to drilling workers and equipment.
Xinxin Zhang, Zhanghui Wu, Zhiqiang Zhao, Pinghe Sun, Lubo Tang, Usman Shabir   +5 more
doaj   +2 more sources

Orthogonal experimental research on the structural parameters of a novel drill bit used for ice core drilling with air reverse circulation [PDF]

Journal of Glaciology, 2019
A new type of ice core drill bit, designed with a vane swirler, was developed for ice core drilling with air reverse circulation. An orthogonal experimental design method was employed to investigate the effects of the swirler structure parameters on the ...
Pinlu Cao, Qi Zhao, Zhuo Chen, Hongyu Cao, Baoyi Chen   +4 more
doaj   +2 more sources

Sealing method and experimental study of large-diameter reverse circulation hole hammer [PDF]

E3S Web of Conferences
A reliable sealing structure is the key to achieving reverse circulation drilling technology for large- diameter reverse circulation down the hole hammers, and it is also a difficult point in the design of large- diameter reverse circulation down the ...
Liu Qi
doaj   +2 more sources

Air-Lifting Reverse-Circulation Drilling in Deep Geothermal Wells and the Effect of Dual-Wall Drill Pipe Depth Down the Hole

Energies
Geothermal energy is a renewable energy source that is rich in reserves, widely distributed, stable and reliable. The development of geothermal energy needs to be carried out by drilling wells to exploit the underground thermal fluid, and air-lift ...
Hongyu Ye, Ziwei Lai, Longjun Tian, Renjie Zhang, Bin Liu, Xiuhua Zheng   +5 more
doaj   +2 more sources

Experimental and Numerical Analysis of Flow Behavior for Reverse Circulation Drill Bit with Inserted Swirl Vanes [PDF]

Geofluids, 2022
A swirling drill bit designed with an integrated vane swirler was developed to improve reverse circulation in down-the-hole hammer drilling. Its entrainment effect and influential factors were investigated by CFD simulation and experimental tests.
Cheng Yang, Jianliang Jiang, Bo Qi, Guoqing Cui, Liyong Zhang, Yunwang Chen, Pinlu Cao   +6 more
doaj   +2 more sources

Parametrical design and optimization of a reverse circulation drill bit for dust control [PDF]

Frontiers in Built Environment
The reverse circulation down-the-hole air hammer drilling (RC-DTH) method is renowned for its efficiency in hard rock formations and exceptional dust control performance.
Liming Fan, Zhilin Li, Yongjiang Luo
doaj   +2 more sources

Reverse Estuarine Circulation Due to Local and Remote Wind Forcing, Enhanced by the Presence of Along-Coast Estuaries [PDF]

, 2017
Giddings, SN, MacCready, P
core   +3 more sources

Study on Change Rules of Factors Affecting Gas Loss during Coalbed Air Reverse Circulation Sampling [PDF]

Advances in Civil Engineering, 2021
The gas loss in sampling is the root of coalbed gas content measurement error. The pressure and particle size have a significant impact on the gas loss.
Demin Chen, Wei Long, Yanyan Li, Rui Zhang   +3 more
doaj   +2 more sources