Thermal characteristics of a flattened sintered-wick heat pipe

This research aims to study the effect of pipe flattening on heat transfer characteristics and internal phenomena of a sintered wick heat pipe by using the three-dimensional finite element method (3D FEM). The 3D simulation program had been established to study the effect of pipe flattening. The cal...

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Main Authors: P. Sakulchangsatjatai, W. Intagun, P. Terdtoon
Format: Journal
Published: 2018
Online Access:https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84897504252&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/45354
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-453542018-01-24T06:09:02Z Thermal characteristics of a flattened sintered-wick heat pipe P. Sakulchangsatjatai W. Intagun P. Terdtoon This research aims to study the effect of pipe flattening on heat transfer characteristics and internal phenomena of a sintered wick heat pipe by using the three-dimensional finite element method (3D FEM). The 3D simulation program had been established to study the effect of pipe flattening. The calculation domains were separated into three important regions, i.e., vapor core, wick, and wall. The Cartesian coordinates and the three-dimensional tetrahedral elements are applied in this model. The original diameter of the heat pipe is 6 mm. Water was used as a working fluid. The vapor flow is assumed to be laminar and incompressible. The composite wick which made from sintered copper and grooved copper pipe was used. The thickness of wick and wall were 0.70 and 0.30 mm. The wall temperature distribution is recorded when the heat pipe reached steady state operation and the overall thermal resistance is determined to validate with that obtained from the 3D simulation. It was found that the predicted wall temperature and thermal resistance agreed well with the experimental data with the standard deviations of ±5.95% and ±32.85%, respectively. These pressure drops agreed well with Dacry-Weisbach equation and Engineering Sciences Data Unit (ESDU) 79012 with the standard deviation of ±13.84% and ±26.02%, respectively. Furthermore, the overall thermal resistances of the tubular heat pipes (original diameter of 6 mm), which are flattened into the final thickness of 4.0 mm and 3.0 mm, decreased from 0.91 °C/W to 0.83 °C/W, respectively, due to an increase of the contact surface for the heat transfer. However, the overall thermal resistance of a flattened heat pipe with the final thickness of 2.5 mm increased to 0.88 °C/W, In addition, the critical value of the final thickness of heat pipe was about 45% from original diameter. 2018-01-24T06:09:02Z 2018-01-24T06:09:02Z 2014-01-01 Journal 15606686 2-s2.0-84897504252 10.6180/jase.2014.17.1.06 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84897504252&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/45354
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
description This research aims to study the effect of pipe flattening on heat transfer characteristics and internal phenomena of a sintered wick heat pipe by using the three-dimensional finite element method (3D FEM). The 3D simulation program had been established to study the effect of pipe flattening. The calculation domains were separated into three important regions, i.e., vapor core, wick, and wall. The Cartesian coordinates and the three-dimensional tetrahedral elements are applied in this model. The original diameter of the heat pipe is 6 mm. Water was used as a working fluid. The vapor flow is assumed to be laminar and incompressible. The composite wick which made from sintered copper and grooved copper pipe was used. The thickness of wick and wall were 0.70 and 0.30 mm. The wall temperature distribution is recorded when the heat pipe reached steady state operation and the overall thermal resistance is determined to validate with that obtained from the 3D simulation. It was found that the predicted wall temperature and thermal resistance agreed well with the experimental data with the standard deviations of ±5.95% and ±32.85%, respectively. These pressure drops agreed well with Dacry-Weisbach equation and Engineering Sciences Data Unit (ESDU) 79012 with the standard deviation of ±13.84% and ±26.02%, respectively. Furthermore, the overall thermal resistances of the tubular heat pipes (original diameter of 6 mm), which are flattened into the final thickness of 4.0 mm and 3.0 mm, decreased from 0.91 °C/W to 0.83 °C/W, respectively, due to an increase of the contact surface for the heat transfer. However, the overall thermal resistance of a flattened heat pipe with the final thickness of 2.5 mm increased to 0.88 °C/W, In addition, the critical value of the final thickness of heat pipe was about 45% from original diameter.
format Journal
author P. Sakulchangsatjatai
W. Intagun
P. Terdtoon
spellingShingle P. Sakulchangsatjatai
W. Intagun
P. Terdtoon
Thermal characteristics of a flattened sintered-wick heat pipe
author_facet P. Sakulchangsatjatai
W. Intagun
P. Terdtoon
author_sort P. Sakulchangsatjatai
title Thermal characteristics of a flattened sintered-wick heat pipe
title_short Thermal characteristics of a flattened sintered-wick heat pipe
title_full Thermal characteristics of a flattened sintered-wick heat pipe
title_fullStr Thermal characteristics of a flattened sintered-wick heat pipe
title_full_unstemmed Thermal characteristics of a flattened sintered-wick heat pipe
title_sort thermal characteristics of a flattened sintered-wick heat pipe
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84897504252&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/45354
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