STIN special report 1

Loading to structures due to thermal stratification in a T-joint of hot and cold pipes

Timo Pättikangas, Markku Puustinen, Heikki Purhonen, Kim Calonius, Arja Saarenheimo

Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

Abstract

Thermal stratification of hot and cold water may cause damages in pipes of power plants. The main aims of this study are to improve the knowledge of the effects of thermal loads on the structures and to develop and verify a computational tool for numerical simulation of structural behaviour under a thermal stratification. A well-instrumented T-joint test section of hot and cold pipe is used for the experiments. In the hot horizontal pipe, the flow velocity is high, and therefore the flow is strongly turbulent. In the vertical cold pipe, the flow velocity is very small and the flow is laminar. Temperature, strain and displacement measurements will be carried out in order to get data to verify the numerical results. Preliminary results of the computational fluid dynamics (CFD) calculations are presented. Both the flow equations and the thermal conduction in the pipe walls and insulators are solved with the Fluent code. Transition from turbulent to laminar flow occurs near the T-joint in the cold pipe.
Original languageEnglish
Title of host publicationFINNUS: The Finnish Research Programme on Nuclear Power Plant Safety
Subtitle of host publicationInterim Report 1999 - August 2000
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages113-122
ISBN (Electronic)951-38-5751-4
ISBN (Print)951-38-5750-7
Publication statusPublished - 2000
MoE publication typeD2 Article in professional manuals or guides or professional information systems or text book material

Publication series

NameVTT Tiedotteita - Research Notes
PublisherVTT
Number2057
ISSN (Print)1235-0605
ISSN (Electronic)1455-0865

Fingerprint

Thermal stratification
Pipe
Laminar flow
Flow velocity
Displacement measurement
Strain measurement
Thermal load
Temperature measurement
Power plants
Computational fluid dynamics
Computer simulation
Water

Cite this

Pättikangas, T., Puustinen, M., Purhonen, H., Calonius, K., & Saarenheimo, A. (2000). STIN special report 1: Loading to structures due to thermal stratification in a T-joint of hot and cold pipes. In FINNUS: The Finnish Research Programme on Nuclear Power Plant Safety: Interim Report 1999 - August 2000 (pp. 113-122). Espoo: VTT Technical Research Centre of Finland. VTT Tiedotteita - Research Notes, No. 2057
Pättikangas, Timo ; Puustinen, Markku ; Purhonen, Heikki ; Calonius, Kim ; Saarenheimo, Arja. / STIN special report 1 : Loading to structures due to thermal stratification in a T-joint of hot and cold pipes. FINNUS: The Finnish Research Programme on Nuclear Power Plant Safety: Interim Report 1999 - August 2000. Espoo : VTT Technical Research Centre of Finland, 2000. pp. 113-122 (VTT Tiedotteita - Research Notes; No. 2057).
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abstract = "Thermal stratification of hot and cold water may cause damages in pipes of power plants. The main aims of this study are to improve the knowledge of the effects of thermal loads on the structures and to develop and verify a computational tool for numerical simulation of structural behaviour under a thermal stratification. A well-instrumented T-joint test section of hot and cold pipe is used for the experiments. In the hot horizontal pipe, the flow velocity is high, and therefore the flow is strongly turbulent. In the vertical cold pipe, the flow velocity is very small and the flow is laminar. Temperature, strain and displacement measurements will be carried out in order to get data to verify the numerical results. Preliminary results of the computational fluid dynamics (CFD) calculations are presented. Both the flow equations and the thermal conduction in the pipe walls and insulators are solved with the Fluent code. Transition from turbulent to laminar flow occurs near the T-joint in the cold pipe.",
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Pättikangas, T, Puustinen, M, Purhonen, H, Calonius, K & Saarenheimo, A 2000, STIN special report 1: Loading to structures due to thermal stratification in a T-joint of hot and cold pipes. in FINNUS: The Finnish Research Programme on Nuclear Power Plant Safety: Interim Report 1999 - August 2000. VTT Technical Research Centre of Finland, Espoo, VTT Tiedotteita - Research Notes, no. 2057, pp. 113-122.

STIN special report 1 : Loading to structures due to thermal stratification in a T-joint of hot and cold pipes. / Pättikangas, Timo; Puustinen, Markku; Purhonen, Heikki; Calonius, Kim; Saarenheimo, Arja.

FINNUS: The Finnish Research Programme on Nuclear Power Plant Safety: Interim Report 1999 - August 2000. Espoo : VTT Technical Research Centre of Finland, 2000. p. 113-122 (VTT Tiedotteita - Research Notes; No. 2057).

Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

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T2 - Loading to structures due to thermal stratification in a T-joint of hot and cold pipes

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AU - Purhonen, Heikki

AU - Calonius, Kim

AU - Saarenheimo, Arja

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N2 - Thermal stratification of hot and cold water may cause damages in pipes of power plants. The main aims of this study are to improve the knowledge of the effects of thermal loads on the structures and to develop and verify a computational tool for numerical simulation of structural behaviour under a thermal stratification. A well-instrumented T-joint test section of hot and cold pipe is used for the experiments. In the hot horizontal pipe, the flow velocity is high, and therefore the flow is strongly turbulent. In the vertical cold pipe, the flow velocity is very small and the flow is laminar. Temperature, strain and displacement measurements will be carried out in order to get data to verify the numerical results. Preliminary results of the computational fluid dynamics (CFD) calculations are presented. Both the flow equations and the thermal conduction in the pipe walls and insulators are solved with the Fluent code. Transition from turbulent to laminar flow occurs near the T-joint in the cold pipe.

AB - Thermal stratification of hot and cold water may cause damages in pipes of power plants. The main aims of this study are to improve the knowledge of the effects of thermal loads on the structures and to develop and verify a computational tool for numerical simulation of structural behaviour under a thermal stratification. A well-instrumented T-joint test section of hot and cold pipe is used for the experiments. In the hot horizontal pipe, the flow velocity is high, and therefore the flow is strongly turbulent. In the vertical cold pipe, the flow velocity is very small and the flow is laminar. Temperature, strain and displacement measurements will be carried out in order to get data to verify the numerical results. Preliminary results of the computational fluid dynamics (CFD) calculations are presented. Both the flow equations and the thermal conduction in the pipe walls and insulators are solved with the Fluent code. Transition from turbulent to laminar flow occurs near the T-joint in the cold pipe.

M3 - Chapter or book article

SN - 951-38-5750-7

T3 - VTT Tiedotteita - Research Notes

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BT - FINNUS: The Finnish Research Programme on Nuclear Power Plant Safety

PB - VTT Technical Research Centre of Finland

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ER -

Pättikangas T, Puustinen M, Purhonen H, Calonius K, Saarenheimo A. STIN special report 1: Loading to structures due to thermal stratification in a T-joint of hot and cold pipes. In FINNUS: The Finnish Research Programme on Nuclear Power Plant Safety: Interim Report 1999 - August 2000. Espoo: VTT Technical Research Centre of Finland. 2000. p. 113-122. (VTT Tiedotteita - Research Notes; No. 2057).