Blocking of Snow/Water Slurry Flow in Pipeline Caused by Compression-Strengthening of Snow Column

Sustainability

Masataka Shirakashi³  Shuichi Yamada¹  Yoshitaka Kawada² 

[1] Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata, Japan; E-Mail:;Nagaoka National College of Technology, 888 Nishikatakai, Nagaoka, Niigata, Japan; E-Mail:;Malaysia-Japan International Institute of Technology, Univeristi Teknologi Malaysia, Kuala Lumpur 53300, Malaysia

关键词: Hydraulic conveying of snow;    Snow removal;    Utilization of snow;    District cooling system;    Cooling energy;    Blocking;    Compression strengthening;   

DOI  :  10.3390/su6020530

来源: mdpi

【 摘 要 】

In earlier works by the present authors, two systems for sustainable energy were proposed: (i) a system for urban snow removal in winter and storage for air conditioning in summer, applied to Nagaoka City, which suffers heavy snow fall every winter, and (ii) a district cooling system utilizing latent heat of ice to reduce the size of storage reservoir and transportation pipeline system. In these systems, the hydraulic conveying of snow or ice through pump-and-pipeline is the key technique to be developed, since characteristics of snow (ice)/ water slurry is largely different from those of conventional non-cohesive solid particle slurries. In this study, the blocking of pipeline of snow/water slurry is investigated experimentally. While the blocking of conventional slurry occurs due to deposition of heavy particles at low flow velocity or arching of large rigid particles, that of snow/water slurry is caused by a compressed plug of snow formed due to cohesive nature of snow particles. This is because the strength of snow plug formed at a high resistance piping element, such as an orifice, becomes higher when the compression velocity is lower, resulting in a solid-like plug filling the whole channel upstream the element.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.