Heat transfer enhancement in evaporating mini-layers

Effects of an inert gas flow

C. S. Iorio, O. A. Kabov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

When a layer of volatile liquid is subject to a flow of inert gas, a non-uniform distribution of the evaporation rate is generated all along the interface. Being evaporation stronger at the inlet boundary of the layer, because of the maximal efficiency of the inert gas flow in removing vapor from the interface, a thermal gradient along the interface is generated. Two opposite mechanisms regulate the movement of the interface: the shear stress of the gas that entrains the interface in the direction of the flow and the thermo-capillary stress that forces the interface to move against the flow direction. Moreover, because of the overall cooling of the interface due to the evaporative process, a gradient normal to the interface is also created. It results in a potentially unstable situation that is strongly influenced by the flow rate of inert gas, the layer thickness and the liquid thermo-physical properties. The goal of the present work is to study numerically if and how the dynamic evolution of the liquid layer is driven by the above-mentioned mechanisms. The main results concern the evaluation of the influence of the thermal instability patterns, eventually generated by the concurrent action of non-uniform evaporation and thermo-capillary motion, on the heat transfer at the bottom liquid. The distribution of temperature and velocity in the gas and liquid bulk phase for different mass flow rate of inert gas has also been of interest.

Original languageEnglish
Title of host publicationProceedings of the 5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007
Pages879-883
Number of pages5
DOIs
Publication statusPublished - 2007
Event5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007 - Puebla, Mexico
Duration: 18 Jun 200720 Jun 2007

Other

Other5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007
CountryMexico
CityPuebla
Period18.6.0720.6.07

Fingerprint

Inert gases
gas flow
Flow of gases
rare gases
heat transfer
Heat transfer
augmentation
Liquids
Evaporation
liquids
Flow rate
Gases
Thermal gradients
evaporation
Shear stress
Thermodynamic properties
gradients
thermal instability
Vapors
evaporation rate

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physics and Astronomy(all)

Cite this

Iorio, C. S., & Kabov, O. A. (2007). Heat transfer enhancement in evaporating mini-layers: Effects of an inert gas flow. In Proceedings of the 5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007 (pp. 879-883) https://doi.org/10.1115/ICNMM2007-30172

Heat transfer enhancement in evaporating mini-layers : Effects of an inert gas flow. / Iorio, C. S.; Kabov, O. A.

Proceedings of the 5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007. 2007. p. 879-883.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Iorio, CS & Kabov, OA 2007, Heat transfer enhancement in evaporating mini-layers: Effects of an inert gas flow. in Proceedings of the 5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007. pp. 879-883, 5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007, Puebla, Mexico, 18.6.07. https://doi.org/10.1115/ICNMM2007-30172
Iorio CS, Kabov OA. Heat transfer enhancement in evaporating mini-layers: Effects of an inert gas flow. In Proceedings of the 5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007. 2007. p. 879-883 https://doi.org/10.1115/ICNMM2007-30172
Iorio, C. S. ; Kabov, O. A. / Heat transfer enhancement in evaporating mini-layers : Effects of an inert gas flow. Proceedings of the 5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007. 2007. pp. 879-883
@inproceedings{34468c83743c4d818694c4d697139111,
title = "Heat transfer enhancement in evaporating mini-layers: Effects of an inert gas flow",
abstract = "When a layer of volatile liquid is subject to a flow of inert gas, a non-uniform distribution of the evaporation rate is generated all along the interface. Being evaporation stronger at the inlet boundary of the layer, because of the maximal efficiency of the inert gas flow in removing vapor from the interface, a thermal gradient along the interface is generated. Two opposite mechanisms regulate the movement of the interface: the shear stress of the gas that entrains the interface in the direction of the flow and the thermo-capillary stress that forces the interface to move against the flow direction. Moreover, because of the overall cooling of the interface due to the evaporative process, a gradient normal to the interface is also created. It results in a potentially unstable situation that is strongly influenced by the flow rate of inert gas, the layer thickness and the liquid thermo-physical properties. The goal of the present work is to study numerically if and how the dynamic evolution of the liquid layer is driven by the above-mentioned mechanisms. The main results concern the evaluation of the influence of the thermal instability patterns, eventually generated by the concurrent action of non-uniform evaporation and thermo-capillary motion, on the heat transfer at the bottom liquid. The distribution of temperature and velocity in the gas and liquid bulk phase for different mass flow rate of inert gas has also been of interest.",
author = "Iorio, {C. S.} and Kabov, {O. A.}",
year = "2007",
doi = "10.1115/ICNMM2007-30172",
language = "English",
isbn = "079184272X",
pages = "879--883",
booktitle = "Proceedings of the 5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007",

}

TY - GEN

T1 - Heat transfer enhancement in evaporating mini-layers

T2 - Effects of an inert gas flow

AU - Iorio, C. S.

AU - Kabov, O. A.

PY - 2007

Y1 - 2007

N2 - When a layer of volatile liquid is subject to a flow of inert gas, a non-uniform distribution of the evaporation rate is generated all along the interface. Being evaporation stronger at the inlet boundary of the layer, because of the maximal efficiency of the inert gas flow in removing vapor from the interface, a thermal gradient along the interface is generated. Two opposite mechanisms regulate the movement of the interface: the shear stress of the gas that entrains the interface in the direction of the flow and the thermo-capillary stress that forces the interface to move against the flow direction. Moreover, because of the overall cooling of the interface due to the evaporative process, a gradient normal to the interface is also created. It results in a potentially unstable situation that is strongly influenced by the flow rate of inert gas, the layer thickness and the liquid thermo-physical properties. The goal of the present work is to study numerically if and how the dynamic evolution of the liquid layer is driven by the above-mentioned mechanisms. The main results concern the evaluation of the influence of the thermal instability patterns, eventually generated by the concurrent action of non-uniform evaporation and thermo-capillary motion, on the heat transfer at the bottom liquid. The distribution of temperature and velocity in the gas and liquid bulk phase for different mass flow rate of inert gas has also been of interest.

AB - When a layer of volatile liquid is subject to a flow of inert gas, a non-uniform distribution of the evaporation rate is generated all along the interface. Being evaporation stronger at the inlet boundary of the layer, because of the maximal efficiency of the inert gas flow in removing vapor from the interface, a thermal gradient along the interface is generated. Two opposite mechanisms regulate the movement of the interface: the shear stress of the gas that entrains the interface in the direction of the flow and the thermo-capillary stress that forces the interface to move against the flow direction. Moreover, because of the overall cooling of the interface due to the evaporative process, a gradient normal to the interface is also created. It results in a potentially unstable situation that is strongly influenced by the flow rate of inert gas, the layer thickness and the liquid thermo-physical properties. The goal of the present work is to study numerically if and how the dynamic evolution of the liquid layer is driven by the above-mentioned mechanisms. The main results concern the evaluation of the influence of the thermal instability patterns, eventually generated by the concurrent action of non-uniform evaporation and thermo-capillary motion, on the heat transfer at the bottom liquid. The distribution of temperature and velocity in the gas and liquid bulk phase for different mass flow rate of inert gas has also been of interest.

UR - http://www.scopus.com/inward/record.url?scp=37249076872&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=37249076872&partnerID=8YFLogxK

U2 - 10.1115/ICNMM2007-30172

DO - 10.1115/ICNMM2007-30172

M3 - Conference contribution

SN - 079184272X

SN - 9780791842720

SP - 879

EP - 883

BT - Proceedings of the 5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007

ER -