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NOVEL WALL-MOUNTED HOT-FILM SENSORS FOR THE MEASUREMENT OF THE FORCED CONVECTION FROM AN OPEN CYLINDRICAL CAVITY

Siegrist, Silvan and Stadler, Hannes and Hoffschmidt, Bernhard (2017) NOVEL WALL-MOUNTED HOT-FILM SENSORS FOR THE MEASUREMENT OF THE FORCED CONVECTION FROM AN OPEN CYLINDRICAL CAVITY. 9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics (ExHFT-9), 12-15 June 2017, Foz do Iguacu, Brazil.

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Abstract

We investigated the forced convective heat loss from a model of a multi-MW cavity receiver of a concentrated solar power (CSP) tower system in a high-pressure wind tunnel. For the tests, arrays of a novel ringlike design of hot-film sensors were placed on the inside wall of the open cylindrical cavity. A constant temperature anemometry (CTA) system controlled these sensors and returned a signal as a function of the instantaneous total heat loss in each sensor. This heat loss was interpolated and averaged to form an integral heat loss value for each given set of wind speed and wind direction. The experiments covered a Reynolds number range of between 2*10^6 and 8*10^6, based on the external flow field. During the 10 days of testing, the ringlike hot-film sensors worked reliably and proved to deliver significant and reproducible results. The maximum forced convective heat loss for the tested geometry occurs at an incident angle of 70°, at all tested Reynolds numbers.

Item URL in elib:https://elib.dlr.de/112812/
Document Type:Conference or Workshop Item (Speech)
Title:NOVEL WALL-MOUNTED HOT-FILM SENSORS FOR THE MEASUREMENT OF THE FORCED CONVECTION FROM AN OPEN CYLINDRICAL CAVITY
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Siegrist, SilvanSilvan.Siegrist (at) dlr.dehttps://orcid.org/0000-0001-9069-2220
Stadler, HannesHannes.Stadler (at) dlr.dehttps://orcid.org/0000-0001-5122-4221
Hoffschmidt, BernhardBernhard.Hoffschmidt (at) dlr.deUNSPECIFIED
Date:13 June 2017
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:hot-film sensor, constant temperature anemometry, forced convection, high-pressure wind tunnel, concentrated solar power cavity receiver
Event Title:9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics (ExHFT-9)
Event Location:Foz do Iguacu, Brazil
Event Type:international Conference
Event Dates:12-15 June 2017
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Advanced Heat Transfer Media
Location: Jülich
Institutes and Institutions:Institute of Solar Research > Punktfokussierende Systeme
Deposited By: Siegrist, Silvan
Deposited On:09 Aug 2017 10:04
Last Modified:31 Jul 2019 20:10

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