The lock-up phenomenon of exhaled flow in a stable thermally-stratified indoor environment

Qi Zhou, Hua Qian, Haigang Ren, Yuguo Li, Peter Vilhelm Nielsen

Research output: Contribution to journalJournal articleResearchpeer-review

6 Citations (Scopus)

Abstract

Highlights
•The lock-up phenomenon in thermally-stratified environment is explained using jet mechanics.
•Non-dimensional governing equations of buoyant jet are derived.
•The lock-up height of exhaled flow can be predicted by using a simple buoyant jet model.
•A smaller Ar number or a steeper temperature gradient leads to a lower lock-up height.
•Variation of lock-up height in different temperature gradients follows a power law relation.
Original languageEnglish
JournalBuilding and Environment
Volume116
Pages (from-to)246-256
ISSN0360-1323
DOIs
Publication statusPublished - 2017

Fingerprint

mechanic
Thermal gradients
temperature gradient
Law
mechanics
Mechanics
power law
indoor environment

Keywords

  • Exhaled flow
  • Buoyant jet
  • Temperature gradient
  • Jet mechanics
  • Dispersion

Cite this

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title = "The lock-up phenomenon of exhaled flow in a stable thermally-stratified indoor environment",
abstract = "Highlights•The lock-up phenomenon in thermally-stratified environment is explained using jet mechanics.•Non-dimensional governing equations of buoyant jet are derived.•The lock-up height of exhaled flow can be predicted by using a simple buoyant jet model.•A smaller Ar number or a steeper temperature gradient leads to a lower lock-up height.•Variation of lock-up height in different temperature gradients follows a power law relation.",
keywords = "Exhaled flow, Buoyant jet, Temperature gradient, Jet mechanics, Dispersion, Exhaled flow, Buoyant jet, Temperature gradient, Jet mechanics, Dispersion",
author = "Qi Zhou and Hua Qian and Haigang Ren and Yuguo Li and Nielsen, {Peter Vilhelm}",
year = "2017",
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language = "English",
volume = "116",
pages = "246--256",
journal = "Building and Environment",
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publisher = "Pergamon Press",

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The lock-up phenomenon of exhaled flow in a stable thermally-stratified indoor environment. / Zhou, Qi; Qian, Hua; Ren, Haigang; Li, Yuguo; Nielsen, Peter Vilhelm.

In: Building and Environment, Vol. 116, 2017, p. 246-256.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - The lock-up phenomenon of exhaled flow in a stable thermally-stratified indoor environment

AU - Zhou, Qi

AU - Qian, Hua

AU - Ren, Haigang

AU - Li, Yuguo

AU - Nielsen, Peter Vilhelm

PY - 2017

Y1 - 2017

N2 - Highlights•The lock-up phenomenon in thermally-stratified environment is explained using jet mechanics.•Non-dimensional governing equations of buoyant jet are derived.•The lock-up height of exhaled flow can be predicted by using a simple buoyant jet model.•A smaller Ar number or a steeper temperature gradient leads to a lower lock-up height.•Variation of lock-up height in different temperature gradients follows a power law relation.

AB - Highlights•The lock-up phenomenon in thermally-stratified environment is explained using jet mechanics.•Non-dimensional governing equations of buoyant jet are derived.•The lock-up height of exhaled flow can be predicted by using a simple buoyant jet model.•A smaller Ar number or a steeper temperature gradient leads to a lower lock-up height.•Variation of lock-up height in different temperature gradients follows a power law relation.

KW - Exhaled flow

KW - Buoyant jet

KW - Temperature gradient

KW - Jet mechanics

KW - Dispersion

KW - Exhaled flow

KW - Buoyant jet

KW - Temperature gradient

KW - Jet mechanics

KW - Dispersion

U2 - 10.1016/j.buildenv.2017.02.010

DO - 10.1016/j.buildenv.2017.02.010

M3 - Journal article

VL - 116

SP - 246

EP - 256

JO - Building and Environment

JF - Building and Environment

SN - 0360-1323

ER -