Novel Infrared Approach for the Evaluation of Thermofluidic Interactions in a Metallic Flat-Plate Pulsating Heat Pipe
A novel and advanced analysis tool, based on the resolution of the inverse heat conduction problem, is used to evaluate wall-to-fluid heat fluxes in a metallic flat-plate pulsating heat pipe. The device under analysis is made of copper and formed by 16 channels having a squared section of 3 × 3 mm&l...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-11-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/12/22/11682 |
| _version_ | 1797465997815316480 |
|---|---|
| author | Luca Pagliarini Luca Cattani Maksym Slobodeniuk Vincent Ayel Cyril Romestant Fabio Bozzoli Sara Rainieri |
| author_facet | Luca Pagliarini Luca Cattani Maksym Slobodeniuk Vincent Ayel Cyril Romestant Fabio Bozzoli Sara Rainieri |
| author_sort | Luca Pagliarini |
| collection | DOAJ |
| description | A novel and advanced analysis tool, based on the resolution of the inverse heat conduction problem, is used to evaluate wall-to-fluid heat fluxes in a metallic flat-plate pulsating heat pipe. The device under analysis is made of copper and formed by 16 channels having a squared section of 3 × 3 mm<sup>2</sup> and filled with a water–ethanol mixture (20 wt.% of ethanol) with a volumetric filling ratio of 50%. One flat side of the device is externally coated with a highly emissive paint to perform temperature measurements by means of a medium-wave infrared camera. The acquired infrared maps are first processed by a three-dimensional Gaussian filter and then used as inputs for the inverse approach for the evaluation of heat fluxes locally exchanged between the fluid and the thin walls of each channel. The suggested procedure is successfully validated by means of synthetic data. The resulting space–time heat flux distributions are therefore statistically investigated in terms of amplitude and space–time variations, providing quantitative references for the identification of two-phase flow regimes. These unique data give an evaluation of the local heat transfer behavior, which is essential to provide empirical values for the numerical models of pulsating heat pipes. |
| first_indexed | 2024-03-09T18:29:34Z |
| format | Article |
| id | doaj.art-a831b17a2d5244a0baea2494538cafa4 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T18:29:34Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-a831b17a2d5244a0baea2494538cafa42023-11-24T07:39:11ZengMDPI AGApplied Sciences2076-34172022-11-0112221168210.3390/app122211682Novel Infrared Approach for the Evaluation of Thermofluidic Interactions in a Metallic Flat-Plate Pulsating Heat PipeLuca Pagliarini0Luca Cattani1Maksym Slobodeniuk2Vincent Ayel3Cyril Romestant4Fabio Bozzoli5Sara Rainieri6Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, ItalyCIDEA Interdepartmental Centre, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, ItalyPprime Institute, CNRS—ENSMA—Université de Poitiers, Av. Clément Ader 1, 86360 Chasseneuil-du-Poitou, FrancePprime Institute, CNRS—ENSMA—Université de Poitiers, Av. Clément Ader 1, 86360 Chasseneuil-du-Poitou, FrancePprime Institute, CNRS—ENSMA—Université de Poitiers, Av. Clément Ader 1, 86360 Chasseneuil-du-Poitou, FranceDepartment of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, ItalyDepartment of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, ItalyA novel and advanced analysis tool, based on the resolution of the inverse heat conduction problem, is used to evaluate wall-to-fluid heat fluxes in a metallic flat-plate pulsating heat pipe. The device under analysis is made of copper and formed by 16 channels having a squared section of 3 × 3 mm<sup>2</sup> and filled with a water–ethanol mixture (20 wt.% of ethanol) with a volumetric filling ratio of 50%. One flat side of the device is externally coated with a highly emissive paint to perform temperature measurements by means of a medium-wave infrared camera. The acquired infrared maps are first processed by a three-dimensional Gaussian filter and then used as inputs for the inverse approach for the evaluation of heat fluxes locally exchanged between the fluid and the thin walls of each channel. The suggested procedure is successfully validated by means of synthetic data. The resulting space–time heat flux distributions are therefore statistically investigated in terms of amplitude and space–time variations, providing quantitative references for the identification of two-phase flow regimes. These unique data give an evaluation of the local heat transfer behavior, which is essential to provide empirical values for the numerical models of pulsating heat pipes.https://www.mdpi.com/2076-3417/12/22/11682pulsating heat pipeinfrared thermographyinverse heat transferGaussian filter |
| spellingShingle | Luca Pagliarini Luca Cattani Maksym Slobodeniuk Vincent Ayel Cyril Romestant Fabio Bozzoli Sara Rainieri Novel Infrared Approach for the Evaluation of Thermofluidic Interactions in a Metallic Flat-Plate Pulsating Heat Pipe Applied Sciences pulsating heat pipe infrared thermography inverse heat transfer Gaussian filter |
| title | Novel Infrared Approach for the Evaluation of Thermofluidic Interactions in a Metallic Flat-Plate Pulsating Heat Pipe |
| title_full | Novel Infrared Approach for the Evaluation of Thermofluidic Interactions in a Metallic Flat-Plate Pulsating Heat Pipe |
| title_fullStr | Novel Infrared Approach for the Evaluation of Thermofluidic Interactions in a Metallic Flat-Plate Pulsating Heat Pipe |
| title_full_unstemmed | Novel Infrared Approach for the Evaluation of Thermofluidic Interactions in a Metallic Flat-Plate Pulsating Heat Pipe |
| title_short | Novel Infrared Approach for the Evaluation of Thermofluidic Interactions in a Metallic Flat-Plate Pulsating Heat Pipe |
| title_sort | novel infrared approach for the evaluation of thermofluidic interactions in a metallic flat plate pulsating heat pipe |
| topic | pulsating heat pipe infrared thermography inverse heat transfer Gaussian filter |
| url | https://www.mdpi.com/2076-3417/12/22/11682 |
| work_keys_str_mv | AT lucapagliarini novelinfraredapproachfortheevaluationofthermofluidicinteractionsinametallicflatplatepulsatingheatpipe AT lucacattani novelinfraredapproachfortheevaluationofthermofluidicinteractionsinametallicflatplatepulsatingheatpipe AT maksymslobodeniuk novelinfraredapproachfortheevaluationofthermofluidicinteractionsinametallicflatplatepulsatingheatpipe AT vincentayel novelinfraredapproachfortheevaluationofthermofluidicinteractionsinametallicflatplatepulsatingheatpipe AT cyrilromestant novelinfraredapproachfortheevaluationofthermofluidicinteractionsinametallicflatplatepulsatingheatpipe AT fabiobozzoli novelinfraredapproachfortheevaluationofthermofluidicinteractionsinametallicflatplatepulsatingheatpipe AT sararainieri novelinfraredapproachfortheevaluationofthermofluidicinteractionsinametallicflatplatepulsatingheatpipe |