New method for transient cold wall heat flux measurements for unlimited exposure times
Abstract This paper presents a new method to measure high cold wall surface heat fluxes temporally resolved. It is based on a system identification approach, the so-called Non-Integer System Identification (NISI) method, which allows to correlate the surface heat flux to one single in-depth temperat...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-05-01
|
| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-03245-8 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850243671486627840 |
|---|---|
| author | Fabian Hufgard Christian Duernhofer Clemens Mueller Stefan Loehle |
| author_facet | Fabian Hufgard Christian Duernhofer Clemens Mueller Stefan Loehle |
| author_sort | Fabian Hufgard |
| collection | DOAJ |
| description | Abstract This paper presents a new method to measure high cold wall surface heat fluxes temporally resolved. It is based on a system identification approach, the so-called Non-Integer System Identification (NISI) method, which allows to correlate the surface heat flux to one single in-depth temperature measurement. Here, the model parameters are found experimentally by non-destructive calibration of the actual sensor hardware. The key feature of the new method is that the sensing wall segment is actively water-cooled at the backside, so that a transient, i.e. temporally varying, heat flux can be determined over long periods of time without damaging the sensing element. In the paper, the NISI model equation is derived from the heat equation considering this cooled backside boundary condition. We prove the useful applicability of our new approach by assessing data from a numerical thermal simulation. The determined heat flux shows excellent agreement with the known input data. |
| format | Article |
| id | doaj-art-371d3aca0a2a4128b1f50b84ab302291 |
| institution | OA Journals |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-371d3aca0a2a4128b1f50b84ab3022912025-08-20T01:59:56ZengNature PortfolioScientific Reports2045-23222025-05-0115111010.1038/s41598-025-03245-8New method for transient cold wall heat flux measurements for unlimited exposure timesFabian Hufgard0Christian Duernhofer1Clemens Mueller2Stefan Loehle3High Enthalpy Flow Diagnostics Group (HEFDiG), Institute of Space Systems, University of StuttgartHigh Enthalpy Flow Diagnostics Group (HEFDiG), Institute of Space Systems, University of StuttgartHigh Enthalpy Flow Diagnostics Group (HEFDiG), Institute of Space Systems, University of StuttgartHigh Enthalpy Flow Diagnostics Group (HEFDiG), Institute of Space Systems, University of StuttgartAbstract This paper presents a new method to measure high cold wall surface heat fluxes temporally resolved. It is based on a system identification approach, the so-called Non-Integer System Identification (NISI) method, which allows to correlate the surface heat flux to one single in-depth temperature measurement. Here, the model parameters are found experimentally by non-destructive calibration of the actual sensor hardware. The key feature of the new method is that the sensing wall segment is actively water-cooled at the backside, so that a transient, i.e. temporally varying, heat flux can be determined over long periods of time without damaging the sensing element. In the paper, the NISI model equation is derived from the heat equation considering this cooled backside boundary condition. We prove the useful applicability of our new approach by assessing data from a numerical thermal simulation. The determined heat flux shows excellent agreement with the known input data.https://doi.org/10.1038/s41598-025-03245-8Transient heat flux measurementInverse problem |
| spellingShingle | Fabian Hufgard Christian Duernhofer Clemens Mueller Stefan Loehle New method for transient cold wall heat flux measurements for unlimited exposure times Scientific Reports Transient heat flux measurement Inverse problem |
| title | New method for transient cold wall heat flux measurements for unlimited exposure times |
| title_full | New method for transient cold wall heat flux measurements for unlimited exposure times |
| title_fullStr | New method for transient cold wall heat flux measurements for unlimited exposure times |
| title_full_unstemmed | New method for transient cold wall heat flux measurements for unlimited exposure times |
| title_short | New method for transient cold wall heat flux measurements for unlimited exposure times |
| title_sort | new method for transient cold wall heat flux measurements for unlimited exposure times |
| topic | Transient heat flux measurement Inverse problem |
| url | https://doi.org/10.1038/s41598-025-03245-8 |
| work_keys_str_mv | AT fabianhufgard newmethodfortransientcoldwallheatfluxmeasurementsforunlimitedexposuretimes AT christianduernhofer newmethodfortransientcoldwallheatfluxmeasurementsforunlimitedexposuretimes AT clemensmueller newmethodfortransientcoldwallheatfluxmeasurementsforunlimitedexposuretimes AT stefanloehle newmethodfortransientcoldwallheatfluxmeasurementsforunlimitedexposuretimes |