Abstract
This study is concerned with the phenomenon of flow instability in the entrance region of a pulsating pipe flow perturbed by a trip wire at the inlet, where the flow was uniform at the core with a thin boundary layer on the wall. First of all, it is illustrated by a case without the installation of a trip wire that small disturbance developed in the accelerating phase of pulsation, which was well explained by the inflection-point instability mechanism. Subsequently, one of the cases studied with the installation of a trip wire indicates that the inflection-point instability mechanism still played the key role, but the instability was promoted further upstream. On the other hand, there were cases of which the flow instability development was rather due to the viscous effect mainly, which was decaying in a certain downstream region, followed by a renewal growth with irregular fluctuations.
| Original language | English |
|---|---|
| Article number | 109869 |
| Journal | Experimental Thermal and Fluid Science |
| Volume | 109 |
| DOIs | |
| Publication status | Published - 2019 Dec 1 |
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All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Nuclear Energy and Engineering
- Aerospace Engineering
- Mechanical Engineering
- Fluid Flow and Transfer Processes
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Pulsating pipe flow instability perturbed by a trip wire. / Nguyen, Q. H.; Miau, Jiun-Jih; Lai, Y. H.; Josula, R.
In: Experimental Thermal and Fluid Science, Vol. 109, 109869, 01.12.2019.Research output: Contribution to journal › Article
TY - JOUR
T1 - Pulsating pipe flow instability perturbed by a trip wire
AU - Nguyen, Q. H.
AU - Miau, Jiun-Jih
AU - Lai, Y. H.
AU - Josula, R.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - This study is concerned with the phenomenon of flow instability in the entrance region of a pulsating pipe flow perturbed by a trip wire at the inlet, where the flow was uniform at the core with a thin boundary layer on the wall. First of all, it is illustrated by a case without the installation of a trip wire that small disturbance developed in the accelerating phase of pulsation, which was well explained by the inflection-point instability mechanism. Subsequently, one of the cases studied with the installation of a trip wire indicates that the inflection-point instability mechanism still played the key role, but the instability was promoted further upstream. On the other hand, there were cases of which the flow instability development was rather due to the viscous effect mainly, which was decaying in a certain downstream region, followed by a renewal growth with irregular fluctuations.
AB - This study is concerned with the phenomenon of flow instability in the entrance region of a pulsating pipe flow perturbed by a trip wire at the inlet, where the flow was uniform at the core with a thin boundary layer on the wall. First of all, it is illustrated by a case without the installation of a trip wire that small disturbance developed in the accelerating phase of pulsation, which was well explained by the inflection-point instability mechanism. Subsequently, one of the cases studied with the installation of a trip wire indicates that the inflection-point instability mechanism still played the key role, but the instability was promoted further upstream. On the other hand, there were cases of which the flow instability development was rather due to the viscous effect mainly, which was decaying in a certain downstream region, followed by a renewal growth with irregular fluctuations.
UR - http://www.scopus.com/inward/record.url?scp=85069732337&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85069732337&partnerID=8YFLogxK
U2 - 10.1016/j.expthermflusci.2019.109869
DO - 10.1016/j.expthermflusci.2019.109869
M3 - Article
AN - SCOPUS:85069732337
VL - 109
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
SN - 0894-1777
M1 - 109869
ER -