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Efficient and Open-Source Tool for the Prediction of Thermowell Structural Response / CALLUM JONES

Swansea University Author: CALLUM JONES

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DOI (Published version): 10.23889/SUthesis.66200

Abstract

Thermowells are widely used in the aid of the measurement of temperature in high velocity or corrosive flow in large industrial installations. They are susceptible to vortex induced vibration which can be a cause of two types of damage; fatigue failure and resonance failure. Hence it is important to...

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Published: Swansea University, Wales, UK 2024
Institution: Swansea University
Degree level: Master of Philosophy
Degree name: M.Phil
Supervisor: Gil, A. J., and Rolland, S.
URI: https://cronfa.swan.ac.uk/Record/cronfa66200
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first_indexed 2024-04-25T14:53:21Z
last_indexed 2024-04-25T14:53:21Z
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spelling v2 66200 2024-04-25 Efficient and Open-Source Tool for the Prediction of Thermowell Structural Response 217b6c7d806df899a60722e999cc7a75 CALLUM JONES CALLUM JONES true false 2024-04-25 Thermowells are widely used in the aid of the measurement of temperature in high velocity or corrosive flow in large industrial installations. They are susceptible to vortex induced vibration which can be a cause of two types of damage; fatigue failure and resonance failure. Hence it is important to understand the mechanisms that may avoid vortex induced vibration as failure of a thermowell can cause a leak in the pipe or vessel it is installed on. An industry standard for the sizing and installation of a thermowell in order to avoid failure due to vortex induced vibration, hydrostatic pressure or static bending already exists. The standard is thorough and has been amended as recently as 2016 in order to increase safety in working with thermowells. However, it has its shortcomings with some assumptions it makes and when considering unique designs. A unique design of particular interest from industry is that of a cylindrical well with helical strakes attached. This affects the boundary layer of the fluid on the thermowell.In this work, a novel tool is developed for computing the structural response of a thermowell depending on the flow environment in which it is placed in. The tool exploits one-way coupling requiring the physics of fluid flow and solid dynamics. The incompressible Navier-Stokes equations with a RANS turbulence model and a structural modal superposition method are used to solve for the fluid and the solid. An experimental setup was also proposed with the purpose of benchmarking the numerical approach, however, experimental testing was not pursued.The numerical model showed a significant reduction in time dynamic oscillatory force being applied to the thermowell when helical strakes are introduced but an increase in steady state force. Therefore, with the presence of helical strakes, the dynamics stress levels that the thermowell experiences is reduced making the thermowell less susceptible to failure. E-Thesis Swansea University, Wales, UK Thermowell, modal superposition, structural, cylindrical geometry, helical strakes, fluid, k-omega SST, opensource, prediction 5 3 2024 2024-03-05 10.23889/SUthesis.66200 A selection of content is redacted or is partially redacted from this thesis to protect sensitive and personal information COLLEGE NANME COLLEGE CODE Swansea University Gil, A. J., and Rolland, S. Master of Philosophy M.Phil European Social Fund via the Welsh Government (WEFO) European Social Fund via the Welsh Government (WEFO) 2024-06-20T14:11:27.6457190 2024-04-25T15:46:44.4238573 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering CALLUM JONES 1 66200__30702__b251008be44f4704bb55c84bdaa5a2fb.pdf 2023_Callum_J.final.66200.pdf 2024-06-20T14:08:50.0386106 Output 5085680 application/pdf E-Thesis – open access true Copyright: The Author, Callum Lloyd Jones, 2023 true eng
title Efficient and Open-Source Tool for the Prediction of Thermowell Structural Response
spellingShingle Efficient and Open-Source Tool for the Prediction of Thermowell Structural Response
CALLUM JONES
title_short Efficient and Open-Source Tool for the Prediction of Thermowell Structural Response
title_full Efficient and Open-Source Tool for the Prediction of Thermowell Structural Response
title_fullStr Efficient and Open-Source Tool for the Prediction of Thermowell Structural Response
title_full_unstemmed Efficient and Open-Source Tool for the Prediction of Thermowell Structural Response
title_sort Efficient and Open-Source Tool for the Prediction of Thermowell Structural Response
author_id_str_mv 217b6c7d806df899a60722e999cc7a75
author_id_fullname_str_mv 217b6c7d806df899a60722e999cc7a75_***_CALLUM JONES
author CALLUM JONES
author2 CALLUM JONES
format E-Thesis
publishDate 2024
institution Swansea University
doi_str_mv 10.23889/SUthesis.66200
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description Thermowells are widely used in the aid of the measurement of temperature in high velocity or corrosive flow in large industrial installations. They are susceptible to vortex induced vibration which can be a cause of two types of damage; fatigue failure and resonance failure. Hence it is important to understand the mechanisms that may avoid vortex induced vibration as failure of a thermowell can cause a leak in the pipe or vessel it is installed on. An industry standard for the sizing and installation of a thermowell in order to avoid failure due to vortex induced vibration, hydrostatic pressure or static bending already exists. The standard is thorough and has been amended as recently as 2016 in order to increase safety in working with thermowells. However, it has its shortcomings with some assumptions it makes and when considering unique designs. A unique design of particular interest from industry is that of a cylindrical well with helical strakes attached. This affects the boundary layer of the fluid on the thermowell.In this work, a novel tool is developed for computing the structural response of a thermowell depending on the flow environment in which it is placed in. The tool exploits one-way coupling requiring the physics of fluid flow and solid dynamics. The incompressible Navier-Stokes equations with a RANS turbulence model and a structural modal superposition method are used to solve for the fluid and the solid. An experimental setup was also proposed with the purpose of benchmarking the numerical approach, however, experimental testing was not pursued.The numerical model showed a significant reduction in time dynamic oscillatory force being applied to the thermowell when helical strakes are introduced but an increase in steady state force. Therefore, with the presence of helical strakes, the dynamics stress levels that the thermowell experiences is reduced making the thermowell less susceptible to failure.
published_date 2024-03-05T14:11:27Z
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score 11.0267

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