Experimental investigation of supplied flow characteristics under impinging jet ventilation systems with round duct supply terminal

Yamasawa, Haruna; Kobayashi, Tomohiro; Yamanaka, Toshio; Choi, Narae; Koshida, Moe

doi:https://doi.org/10.1016/j.buildenv.2025.114084

Experimental investigation of supplied flow characteristics under impinging jet ventilation systems with round duct supply terminal

Yamasawa, Haruna; Kobayashi, Tomohiro; Yamanaka, Toshio et al.

Building and Environment, 2026, 289, 114084

Number of Access:77（2026-02-04 02:28 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/103577

Link to primary information

File	Format	Terms of use	Size	Views	Date.Available	Description	information
BuildEnviron_289	pdf	None	6.82 MB	19	2026.01.16

Creative Commons : Attribution

Item Information

Output File Export EndNote Basic Export Mendeley

Title	Experimental investigation of supplied flow characteristics under impinging jet ventilation systems with round duct supply terminal
Creator	NRID 1000080982305 1000080982305 ORCID 0000-0002-1262-8781 0000-0002-1262-8781 researchmap permalink yamasaswa_haruna yamasaswa_haruna Scopus Author ID 57221740075 57221740075 CreatorName Yamasawa, Haruna
	NRID 1000090580952 1000090580952 ORCID 0000-0003-4956-1274 0000-0003-4956-1274 researchmap permalink tkoba_0151426 tkoba_0151426 Scopus Author ID 55724294200 55724294200 CreatorName Kobayashi, Tomohiro
	NRID 1000080182575 1000080182575 ORCID 0000-0002-7660-1609 0000-0002-7660-1609 researchmap permalink read0014081 read0014081 Scopus Author ID 7402162289 7402162289 CreatorName Yamanaka, Toshio
	NRID 1000010826481 1000010826481 ORCID 0000-0003-1938-5900 0000-0003-1938-5900 researchmap permalink naraechoi naraechoi Scopus Author ID 55218081800 55218081800 CreatorName Choi, Narae
	CreatorName Koshida, Moe
Subject	Full-scale experiment
	Impinging jet ventilation
	Particle image velocimetry
	Velocity profile
Description	Yamasawa H., Kobayashi T., Yamanaka T., et al. Experimental investigation of supplied flow characteristics under impinging jet ventilation systems with round duct supply terminal. Building and Environment 289, 114084 (2026); https://doi.org/10.1016/j.buildenv.2025.114084.
Abstract	Using the impinging jet ventilation system (IJV), it is possible to accomplish high ventilation effectiveness within the occupied zone. Since the supplied air spreads along the floor, the flow feature is assumed to have a large impact on the whole room environment. To understand this, the jet's velocity profile was measured using a hotwire anemometer under isothermal conditions and particle image velocimetry (PIV) under isothermal and cooling conditions. Firstly, the velocity and turbulence intensity of the supply jet were measured to be around 2.8 m/s and 9.8%, respectively. Secondly, the maximum velocity decay and jet half-width expansion were shown. Thirdly, the relationship between measured dimensionless radial velocity and dimensionless height was shown to have a good agreement with Verhoff's equation and the free turbulent jet's equation in most of the regions, regardless of the angle from the wall. Fourthly, the velocity profiles at the central cross-section measured by the hotwire anemometer and PIV are almost the same in the region sufficiently far from the supply duct. Finally, the velocity profiles under isothermal and cooling conditions measured by PIV were practically the same; therefore, it is assumed that the findings listed above can also be applied to cooling conditions as well.
Publisher	Elsevier Ltd
Source Title	Building and Environment
Volume (Issue)	289
Page	114084
Date of Issued	2026-02-01
Language	English
Handle URL	https://hdl.handle.net/11094/103577
PISSN	03601323
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1016/j.buildenv.2025.114084
Access Rights	open access
CopyRight	This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Building and Environment. 2026, 289, p. 114084
DC.title	Experimental investigation of supplied flow characteristics under impinging jet ventilation systems with round duct supply terminal
DC.creator	Yamasawa, Haruna
	Kobayashi, Tomohiro
	Yamanaka, Toshio
	Choi, Narae
	Koshida, Moe
DC.publisher	Elsevier Ltd
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2026-02-01
DC.identifier	https://doi.org/10.1016/j.buildenv.2025.114084
DC.subject	Full-scale experiment
	Impinging jet ventilation
	Particle image velocimetry
	Velocity profile
DC.description	Yamasawa H., Kobayashi T., Yamanaka T., et al. Experimental investigation of supplied flow characteristics under impinging jet ventilation systems with round duct supply terminal. Building and Environment 289, 114084 (2026); https://doi.org/10.1016/j.buildenv.2025.114084.
DCTERMS.abstract	Using the impinging jet ventilation system (IJV), it is possible to accomplish high ventilation effectiveness within the occupied zone. Since the supplied air spreads along the floor, the flow feature is assumed to have a large impact on the whole room environment. To understand this, the jet's velocity profile was measured using a hotwire anemometer under isothermal conditions and particle image velocimetry (PIV) under isothermal and cooling conditions. Firstly, the velocity and turbulence intensity of the supply jet were measured to be around 2.8 m/s and 9.8%, respectively. Secondly, the maximum velocity decay and jet half-width expansion were shown. Thirdly, the relationship between measured dimensionless radial velocity and dimensionless height was shown to have a good agreement with Verhoff's equation and the free turbulent jet's equation in most of the regions, regardless of the angle from the wall. Fourthly, the velocity profiles at the central cross-section measured by the hotwire anemometer and PIV are almost the same in the region sufficiently far from the supply duct. Finally, the velocity profiles under isothermal and cooling conditions measured by PIV were practically the same; therefore, it is assumed that the findings listed above can also be applied to cooling conditions as well.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	103577
citation_title	Experimental investigation of supplied flow characteristics under impinging jet ventilation systems with round duct supply terminal
citation_author	Yamasawa, Haruna
	Kobayashi, Tomohiro
	Yamanaka, Toshio
	Choi, Narae
	Koshida, Moe
citation_publisher	Elsevier Ltd
citation_language	English
citation_date	2026-02-01
citation_journal_title	Building and Environment
citation_volume	289
citation_firstpage	114084
citation_doi	https://doi.org/10.1016/j.buildenv.2025.114084
citation_public_url	https://hdl.handle.net/11094/103577

Experimental investigation of supplied flow characteristics under impinging jet ventilation systems with round duct supply terminal

Link to primary information

Item Information

Show details