Natural convection driven heat transfer in fluids with strongly variable properties: A particle image velocimetry study

V. Valori; G. E. Elsinga; M. Rohde; M. J. Tummers; J. Westerweel; T. H J J Van Der Hagen

Natural convection driven heat transfer in fluids with strongly variable properties: A particle image velocimetry study

V. Valori, G. E. Elsinga, M. Rohde, M. J. Tummers, J. Westerweel, T. H J J Van Der Hagen

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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Abstract

The High Performance Light Water Reactor (HPLWR) is one of the six innovative nuclear energy systems proposed by the Generation IV International Forum. The use of water at supercritical pressure as the coolant in the HPLWR allows a significative increase of the thermal efficiency of the power plant, a reduction in size and complexity of the system and a safety improvement with respect to the use of two phase flows. Fluids at supercritical pressure are characterized by a sharp change of properties, which may lead to an enhancement or deterioration of their heat transfer properties, whose underlying mechanisms are mainly driven by buoyancy and acceleration effects. The motivation of this research is therefore to understand the effect of the sharp change of properties in the fluid flow structure and turbulence production. This work focuses on the influence of buoyancy in particular. The effect of the strongly varying properties, which are far beyond the so-called Boussinesq approximation, was experimentally studied in a water-filled, cubical Rayleigh-Benard cell using Particle Image Velocimetry (PIV). A temperature difference of 40 K is imposed between the bottom and top plate of the cell, ensuring non-Boussinesq conditions. These experiments were conducted at Rayleigh and Prandtl numbers of 6.8 x 108 and 4.4, respectively. For the first time in literature, the instantaneous and averaged flow structures under non-Bousinesq conditions have been experimentally determined on a cross section of the whole domain. Results reveal a slight asymmetric behavior of the fluid due to the large temperature difference between the bottom arid the top plates of the cell, which is a sign of non-Boussinesq effects. The data provided in this study can be used to gain a more in depth understanding of the effect of the strongly varying proprieties of supercritical fluids on natural convection phenomena in supercritical water cooled reactors.

Original language	English
Title of host publication	Proceedings International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015
Publisher	American Nuclear Society
Pages	2301-2314
Volume	3
ISBN (Electronic)	9781510811843
Publication status	Published - 2015
Event	16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015 - Chicago, United States Duration: 30 Aug 2015 → 4 Sep 2015

Conference

Conference	16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015
Country/Territory	United States
City	Chicago
Period	30/08/15 → 4/09/15

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

Non-boussinesq conditions
Particle image velocimetry
Rayleigh-benard convection
Supercritical fluids

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@inproceedings{89e3d553db0749818351fd5853ffe167,

title = "Natural convection driven heat transfer in fluids with strongly variable properties: A particle image velocimetry study",

abstract = "The High Performance Light Water Reactor (HPLWR) is one of the six innovative nuclear energy systems proposed by the Generation IV International Forum. The use of water at supercritical pressure as the coolant in the HPLWR allows a significative increase of the thermal efficiency of the power plant, a reduction in size and complexity of the system and a safety improvement with respect to the use of two phase flows. Fluids at supercritical pressure are characterized by a sharp change of properties, which may lead to an enhancement or deterioration of their heat transfer properties, whose underlying mechanisms are mainly driven by buoyancy and acceleration effects. The motivation of this research is therefore to understand the effect of the sharp change of properties in the fluid flow structure and turbulence production. This work focuses on the influence of buoyancy in particular. The effect of the strongly varying properties, which are far beyond the so-called Boussinesq approximation, was experimentally studied in a water-filled, cubical Rayleigh-Benard cell using Particle Image Velocimetry (PIV). A temperature difference of 40 K is imposed between the bottom and top plate of the cell, ensuring non-Boussinesq conditions. These experiments were conducted at Rayleigh and Prandtl numbers of 6.8 x 108 and 4.4, respectively. For the first time in literature, the instantaneous and averaged flow structures under non-Bousinesq conditions have been experimentally determined on a cross section of the whole domain. Results reveal a slight asymmetric behavior of the fluid due to the large temperature difference between the bottom arid the top plates of the cell, which is a sign of non-Boussinesq effects. The data provided in this study can be used to gain a more in depth understanding of the effect of the strongly varying proprieties of supercritical fluids on natural convection phenomena in supercritical water cooled reactors.",

keywords = "Non-boussinesq conditions, Particle image velocimetry, Rayleigh-benard convection, Supercritical fluids",

author = "V. Valori and Elsinga, {G. E.} and M. Rohde and Tummers, {M. J.} and J. Westerweel and {Van Der Hagen}, {T. H J J}",

note = "Green Open Access added to TU Delft Institutional Repository {\textquoteleft}You share, we take care!{\textquoteright} – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.; 16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015 ; Conference date: 30-08-2015 Through 04-09-2015",

year = "2015",

language = "English",

volume = "3",

pages = "2301--2314",

booktitle = "Proceedings International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015",

publisher = "American Nuclear Society",

}

Valori, V, Elsinga, GE , Rohde, M , Tummers, MJ , Westerweel, J & Van Der Hagen, THJJ 2015, Natural convection driven heat transfer in fluids with strongly variable properties: A particle image velocimetry study. in Proceedings International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015. vol. 3, American Nuclear Society, pp. 2301-2314, 16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015, Chicago, United States, 30/08/15.

Natural convection driven heat transfer in fluids with strongly variable properties : A particle image velocimetry study. / Valori, V.; Elsinga, G. E.; Rohde, M. et al.

Proceedings International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015. Vol. 3 American Nuclear Society, 2015. p. 2301-2314.

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

TY - GEN

T1 - Natural convection driven heat transfer in fluids with strongly variable properties

T2 - 16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015

AU - Valori, V.

AU - Elsinga, G. E.

AU - Rohde, M.

AU - Tummers, M. J.

AU - Westerweel, J.

AU - Van Der Hagen, T. H J J

N1 - Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

PY - 2015

Y1 - 2015

N2 - The High Performance Light Water Reactor (HPLWR) is one of the six innovative nuclear energy systems proposed by the Generation IV International Forum. The use of water at supercritical pressure as the coolant in the HPLWR allows a significative increase of the thermal efficiency of the power plant, a reduction in size and complexity of the system and a safety improvement with respect to the use of two phase flows. Fluids at supercritical pressure are characterized by a sharp change of properties, which may lead to an enhancement or deterioration of their heat transfer properties, whose underlying mechanisms are mainly driven by buoyancy and acceleration effects. The motivation of this research is therefore to understand the effect of the sharp change of properties in the fluid flow structure and turbulence production. This work focuses on the influence of buoyancy in particular. The effect of the strongly varying properties, which are far beyond the so-called Boussinesq approximation, was experimentally studied in a water-filled, cubical Rayleigh-Benard cell using Particle Image Velocimetry (PIV). A temperature difference of 40 K is imposed between the bottom and top plate of the cell, ensuring non-Boussinesq conditions. These experiments were conducted at Rayleigh and Prandtl numbers of 6.8 x 108 and 4.4, respectively. For the first time in literature, the instantaneous and averaged flow structures under non-Bousinesq conditions have been experimentally determined on a cross section of the whole domain. Results reveal a slight asymmetric behavior of the fluid due to the large temperature difference between the bottom arid the top plates of the cell, which is a sign of non-Boussinesq effects. The data provided in this study can be used to gain a more in depth understanding of the effect of the strongly varying proprieties of supercritical fluids on natural convection phenomena in supercritical water cooled reactors.

AB - The High Performance Light Water Reactor (HPLWR) is one of the six innovative nuclear energy systems proposed by the Generation IV International Forum. The use of water at supercritical pressure as the coolant in the HPLWR allows a significative increase of the thermal efficiency of the power plant, a reduction in size and complexity of the system and a safety improvement with respect to the use of two phase flows. Fluids at supercritical pressure are characterized by a sharp change of properties, which may lead to an enhancement or deterioration of their heat transfer properties, whose underlying mechanisms are mainly driven by buoyancy and acceleration effects. The motivation of this research is therefore to understand the effect of the sharp change of properties in the fluid flow structure and turbulence production. This work focuses on the influence of buoyancy in particular. The effect of the strongly varying properties, which are far beyond the so-called Boussinesq approximation, was experimentally studied in a water-filled, cubical Rayleigh-Benard cell using Particle Image Velocimetry (PIV). A temperature difference of 40 K is imposed between the bottom and top plate of the cell, ensuring non-Boussinesq conditions. These experiments were conducted at Rayleigh and Prandtl numbers of 6.8 x 108 and 4.4, respectively. For the first time in literature, the instantaneous and averaged flow structures under non-Bousinesq conditions have been experimentally determined on a cross section of the whole domain. Results reveal a slight asymmetric behavior of the fluid due to the large temperature difference between the bottom arid the top plates of the cell, which is a sign of non-Boussinesq effects. The data provided in this study can be used to gain a more in depth understanding of the effect of the strongly varying proprieties of supercritical fluids on natural convection phenomena in supercritical water cooled reactors.

KW - Non-boussinesq conditions

KW - Particle image velocimetry

KW - Rayleigh-benard convection

KW - Supercritical fluids

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M3 - Conference contribution

AN - SCOPUS:84962692726

VL - 3

SP - 2301

EP - 2314

BT - Proceedings International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015

PB - American Nuclear Society

Y2 - 30 August 2015 through 4 September 2015

ER -

Natural convection driven heat transfer in fluids with strongly variable properties: A particle image velocimetry study

Abstract

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Bibliographical note

Keywords

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Rayleigh-Bénard convection of a supercritical fluid: PIV and heat transfer study

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