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Temperature Field Measurements of Thermal Boundary Layer and Wake of Moving Hot Spheres using Interferometry

Coronel, Stephanie A. and Melguizo-Gavilanes, Josué and Jones, Silken and Shepherd, Joseph E. (2018) Temperature Field Measurements of Thermal Boundary Layer and Wake of Moving Hot Spheres using Interferometry. Experimental Thermal and Fluid Science, 90 . pp. 76-83. ISSN 0894-1777 . http://resolver.caltech.edu/CaltechAUTHORS:20170905-155921011

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Abstract

The methodology used to post-process a raw interferogram of a hot moving sphere falling in an inert nitrogen environment is presented. The steps taken to obtain the temperature field around the hot sphere are explained in detail. These are: (i) noise removal; (ii) phase demodulation; (iii) phase unwrapping; (iv) bias removal; and (v) Abel transform. All the typical features of the flow are revealed such as growth of the thermal boundary layer, shallower temperature gradients were the flow separates, and a hot wake in the recirculation zone. For validation of the methodology, the temperature field is compared against numerical simulations and found to be in excellent qualitative and quantitative agreement all around except at the front and rear stagnation points. The difficulties encountered with resolving these regions are discussed. Overall, interferometry is found to be an excellent tool for resolving thermal flows, including thin regions, such as thermal boundary layers.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.expthermflusci.2017.08.031DOIArticle
http://www.sciencedirect.com/science/article/pii/S0894177717302595PublisherArticle
ORCID:
AuthorORCID
Shepherd, Joseph E.0000-0003-3181-9310
Additional Information:© 2017 Elsevier Inc. Received 3 March 2017, Revised 9 August 2017, Accepted 25 August 2017, Available online 1 September 2017. This work was carried out in the Explosion Dynamics Laboratory of the California Institute of Technology, and was supported by The Boeing Company through a Strategic Research and Development Relationship Agreement CT-BA-GTA-1.
Funders:
Funding AgencyGrant Number
Boeing Company Strategic Research and Development Relationship CT-BA-GTA-1
Subject Keywords:Thermal boundary layer; Sphere; Interferometry
Record Number:CaltechAUTHORS:20170905-155921011
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170905-155921011
Official Citation:Stephanie A. Coronel, Josué Melguizo-Gavilanes, Silken Jones, Joseph E. Shepherd, Temperature field measurements of thermal boundary layer and wake of moving hot spheres using interferometry, Experimental Thermal and Fluid Science, Volume 90, January 2018, Pages 76-83, ISSN 0894-1777, https://doi.org/10.1016/j.expthermflusci.2017.08.031. (http://www.sciencedirect.com/science/article/pii/S0894177717302595)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81164
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 Sep 2017 23:03
Last Modified:12 Oct 2017 21:48

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