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

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 laten...

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Main Authors: Masataka Shirakashi, Shuichi Yamada, Yoshitaka Kawada, Takero Hirochi
Format: Article
Language:English
Published: MDPI AG 2014-01-01
Series:Sustainability
Subjects:
Online Access:http://www.mdpi.com/2071-1050/6/2/530
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spelling doaj-7c5f95b8cf124329995d4110e1e8d67c2020-11-24T23:28:18ZengMDPI AGSustainability2071-10502014-01-016253054410.3390/su6020530su6020530Blocking of Snow/Water Slurry Flow in Pipeline Caused by Compression-Strengthening of Snow ColumnMasataka Shirakashi0Shuichi Yamada1Yoshitaka Kawada2Takero Hirochi3Malaysia-Japan International Institute of Technology, Univeristi Teknologi Malaysia, Kuala Lumpur 53300, MalaysiaNagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata, JapanNagaoka National College of Technology, 888 Nishikatakai, Nagaoka, Niigata, JapanToba National College of Maritime Technology, 1-1 Ikegami, Toba, Mie, JapanIn 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.http://www.mdpi.com/2071-1050/6/2/530Hydraulic conveying of snowSnow removalUtilization of snowDistrict cooling systemCooling energyBlockingCompression strengthening
collection DOAJ
language English
format Article
sources DOAJ
author Masataka Shirakashi
Shuichi Yamada
Yoshitaka Kawada
Takero Hirochi
spellingShingle Masataka Shirakashi
Shuichi Yamada
Yoshitaka Kawada
Takero Hirochi
Blocking of Snow/Water Slurry Flow in Pipeline Caused by Compression-Strengthening of Snow Column
Sustainability
Hydraulic conveying of snow
Snow removal
Utilization of snow
District cooling system
Cooling energy
Blocking
Compression strengthening
author_facet Masataka Shirakashi
Shuichi Yamada
Yoshitaka Kawada
Takero Hirochi
author_sort Masataka Shirakashi
title Blocking of Snow/Water Slurry Flow in Pipeline Caused by Compression-Strengthening of Snow Column
title_short Blocking of Snow/Water Slurry Flow in Pipeline Caused by Compression-Strengthening of Snow Column
title_full Blocking of Snow/Water Slurry Flow in Pipeline Caused by Compression-Strengthening of Snow Column
title_fullStr Blocking of Snow/Water Slurry Flow in Pipeline Caused by Compression-Strengthening of Snow Column
title_full_unstemmed Blocking of Snow/Water Slurry Flow in Pipeline Caused by Compression-Strengthening of Snow Column
title_sort blocking of snow/water slurry flow in pipeline caused by compression-strengthening of snow column
publisher MDPI AG
series Sustainability
issn 2071-1050
publishDate 2014-01-01
description 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.
topic Hydraulic conveying of snow
Snow removal
Utilization of snow
District cooling system
Cooling energy
Blocking
Compression strengthening
url http://www.mdpi.com/2071-1050/6/2/530
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