Abstract
Thin nonisothermal liquid film flowing under action of gravity force and co-current gas flow, which create the tangential force on the gas-liquid interface, in an inclined minichannel is considered. 3D time dependant mathematical model has been developed. Effects of surface tension, temperature dependent viscosity and thermocapillarity are taken into account. The effect of gravity as well as the effect of gas speed has been studied to define main features of the film dynamics. In calculations vector of gravitational acceleration is oriented along the flow and is equal to the normal Earth gravity and Lunar gravity. Our investigations have shown that gravity has a significant effect on the film deformations. At the lower gravity conditions 3D liquid film pattern changes noticeably in spanwise direction and a middle stream between two main lateral waves appears. Also speed of film deformation is higher and stabilization time is longer. Variation of gas Reynolds number from 543 to 2000 does not change noticeably film pattern at normal gravity. At lower gravity conditions increasing of gas Reynolds number decreases significantly the width of the thermocapillary deformations and leads to a film stabilization.
| Original language | English |
|---|---|
| Pages (from-to) | 187-192 |
| Number of pages | 6 |
| Journal | Microgravity Science and Technology |
| Volume | 20 |
| Issue number | 3-4 |
| DOIs | |
| Publication status | Published - 1 Sep 2008 |
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Keywords
- Local heating
- Long-wave theory
- Microgravity
- Shear-driven liquid film
- Thermocapillarity
ASJC Scopus subject areas
- Modelling and Simulation
- Engineering(all)
- Physics and Astronomy(all)
- Applied Mathematics
Cite this
Gravity effect on the locally heated liquid film driven by gas flow in an inclined minichannel. / Kabova, Y. O.; Kuznetsov, V. V.; Kabov, O. A.
In: Microgravity Science and Technology, Vol. 20, No. 3-4, 01.09.2008, p. 187-192.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Gravity effect on the locally heated liquid film driven by gas flow in an inclined minichannel
AU - Kabova, Y. O.
AU - Kuznetsov, V. V.
AU - Kabov, O. A.
PY - 2008/9/1
Y1 - 2008/9/1
N2 - Thin nonisothermal liquid film flowing under action of gravity force and co-current gas flow, which create the tangential force on the gas-liquid interface, in an inclined minichannel is considered. 3D time dependant mathematical model has been developed. Effects of surface tension, temperature dependent viscosity and thermocapillarity are taken into account. The effect of gravity as well as the effect of gas speed has been studied to define main features of the film dynamics. In calculations vector of gravitational acceleration is oriented along the flow and is equal to the normal Earth gravity and Lunar gravity. Our investigations have shown that gravity has a significant effect on the film deformations. At the lower gravity conditions 3D liquid film pattern changes noticeably in spanwise direction and a middle stream between two main lateral waves appears. Also speed of film deformation is higher and stabilization time is longer. Variation of gas Reynolds number from 543 to 2000 does not change noticeably film pattern at normal gravity. At lower gravity conditions increasing of gas Reynolds number decreases significantly the width of the thermocapillary deformations and leads to a film stabilization.
AB - Thin nonisothermal liquid film flowing under action of gravity force and co-current gas flow, which create the tangential force on the gas-liquid interface, in an inclined minichannel is considered. 3D time dependant mathematical model has been developed. Effects of surface tension, temperature dependent viscosity and thermocapillarity are taken into account. The effect of gravity as well as the effect of gas speed has been studied to define main features of the film dynamics. In calculations vector of gravitational acceleration is oriented along the flow and is equal to the normal Earth gravity and Lunar gravity. Our investigations have shown that gravity has a significant effect on the film deformations. At the lower gravity conditions 3D liquid film pattern changes noticeably in spanwise direction and a middle stream between two main lateral waves appears. Also speed of film deformation is higher and stabilization time is longer. Variation of gas Reynolds number from 543 to 2000 does not change noticeably film pattern at normal gravity. At lower gravity conditions increasing of gas Reynolds number decreases significantly the width of the thermocapillary deformations and leads to a film stabilization.
KW - Local heating
KW - Long-wave theory
KW - Microgravity
KW - Shear-driven liquid film
KW - Thermocapillarity
UR - http://www.scopus.com/inward/record.url?scp=49349093988&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=49349093988&partnerID=8YFLogxK
U2 - 10.1007/s12217-008-9032-5
DO - 10.1007/s12217-008-9032-5
M3 - Article
AN - SCOPUS:49349093988
VL - 20
SP - 187
EP - 192
JO - Microgravity Science and Technology
JF - Microgravity Science and Technology
SN - 0938-0108
IS - 3-4
ER -