DNS of turbulent droplet-laden heated channel flow with phase transition at different initial relative humiditiesbh

A. Bukhvostova, E Russo, Johannes G.M. Kuerten, Bernardus J. Geurts

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

In this paper a turbulent channel flow of a mixture of dry air and water vapor with water droplets is examined. Direct numerical simulation is used to quantify the importance of variations in the initial relative humidity. We focus on the droplet behavior along with the thermal properties of the system, such as the Nusselt number. During the initial stages of the simulations droplets evaporate more if the initial relative humidity is lower in order to reach the saturation condition. The difference in the Nusselt number between the cases of the lowest initial relative humidity and the saturation initial condition is on the order of 10% and this is connected with the different total heat capacity of the system. At the same time, we confront compressible and incompressible formulations comparing the results for both phases. A lower initial relative humidity leads to a larger difference in the mean gas mass density between the two formulations because of larger heat and mass transfer. Moreover, we find a larger relative difference in the Nusselt number between the two formulations in case of a lower initial relative humidity. These findings motivate the need to adopt the complete compressible flow model.
Original languageUndefined
Pages (from-to)445-455
Number of pages11
JournalInternational journal of heat and fluid flow
Volume50
DOIs
Publication statusPublished - Dec 2014

Keywords

  • EWI-25326
  • Direct Numerical Simulation
  • Turbulent channel flow
  • IR-93165
  • Phase transition
  • Nusselt number
  • METIS-309670
  • Relative humidity

Cite this

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title = "DNS of turbulent droplet-laden heated channel flow with phase transition at different initial relative humiditiesbh",
abstract = "In this paper a turbulent channel flow of a mixture of dry air and water vapor with water droplets is examined. Direct numerical simulation is used to quantify the importance of variations in the initial relative humidity. We focus on the droplet behavior along with the thermal properties of the system, such as the Nusselt number. During the initial stages of the simulations droplets evaporate more if the initial relative humidity is lower in order to reach the saturation condition. The difference in the Nusselt number between the cases of the lowest initial relative humidity and the saturation initial condition is on the order of 10{\%} and this is connected with the different total heat capacity of the system. At the same time, we confront compressible and incompressible formulations comparing the results for both phases. A lower initial relative humidity leads to a larger difference in the mean gas mass density between the two formulations because of larger heat and mass transfer. Moreover, we find a larger relative difference in the Nusselt number between the two formulations in case of a lower initial relative humidity. These findings motivate the need to adopt the complete compressible flow model.",
keywords = "EWI-25326, Direct Numerical Simulation, Turbulent channel flow, IR-93165, Phase transition, Nusselt number, METIS-309670, Relative humidity",
author = "A. Bukhvostova and E Russo and Kuerten, {Johannes G.M.} and Geurts, {Bernardus J.}",
note = "eemcs-eprint-25326",
year = "2014",
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doi = "10.1016/j.ijheatfluidflow.2014.10.015",
language = "Undefined",
volume = "50",
pages = "445--455",
journal = "International journal of heat and fluid flow",
issn = "0142-727X",
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DNS of turbulent droplet-laden heated channel flow with phase transition at different initial relative humiditiesbh. / Bukhvostova, A.; Russo, E; Kuerten, Johannes G.M.; Geurts, Bernardus J.

In: International journal of heat and fluid flow, Vol. 50, 12.2014, p. 445-455.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - DNS of turbulent droplet-laden heated channel flow with phase transition at different initial relative humiditiesbh

AU - Bukhvostova, A.

AU - Russo, E

AU - Kuerten, Johannes G.M.

AU - Geurts, Bernardus J.

N1 - eemcs-eprint-25326

PY - 2014/12

Y1 - 2014/12

N2 - In this paper a turbulent channel flow of a mixture of dry air and water vapor with water droplets is examined. Direct numerical simulation is used to quantify the importance of variations in the initial relative humidity. We focus on the droplet behavior along with the thermal properties of the system, such as the Nusselt number. During the initial stages of the simulations droplets evaporate more if the initial relative humidity is lower in order to reach the saturation condition. The difference in the Nusselt number between the cases of the lowest initial relative humidity and the saturation initial condition is on the order of 10% and this is connected with the different total heat capacity of the system. At the same time, we confront compressible and incompressible formulations comparing the results for both phases. A lower initial relative humidity leads to a larger difference in the mean gas mass density between the two formulations because of larger heat and mass transfer. Moreover, we find a larger relative difference in the Nusselt number between the two formulations in case of a lower initial relative humidity. These findings motivate the need to adopt the complete compressible flow model.

AB - In this paper a turbulent channel flow of a mixture of dry air and water vapor with water droplets is examined. Direct numerical simulation is used to quantify the importance of variations in the initial relative humidity. We focus on the droplet behavior along with the thermal properties of the system, such as the Nusselt number. During the initial stages of the simulations droplets evaporate more if the initial relative humidity is lower in order to reach the saturation condition. The difference in the Nusselt number between the cases of the lowest initial relative humidity and the saturation initial condition is on the order of 10% and this is connected with the different total heat capacity of the system. At the same time, we confront compressible and incompressible formulations comparing the results for both phases. A lower initial relative humidity leads to a larger difference in the mean gas mass density between the two formulations because of larger heat and mass transfer. Moreover, we find a larger relative difference in the Nusselt number between the two formulations in case of a lower initial relative humidity. These findings motivate the need to adopt the complete compressible flow model.

KW - EWI-25326

KW - Direct Numerical Simulation

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KW - IR-93165

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KW - Nusselt number

KW - METIS-309670

KW - Relative humidity

U2 - 10.1016/j.ijheatfluidflow.2014.10.015

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EP - 455

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SN - 0142-727X

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