Assessment of experimental optical techniques for characterizing heat transfer using numerical simulations

López Juste, Gregorio and Fajardo, P. (2015). Assessment of experimental optical techniques for characterizing heat transfer using numerical simulations. "Engineering Applications of Computational Fluid Mechanics", v. 9 (n. 1); pp. 84-98. ISSN 1994-2060. https://doi.org/10.1080/19942060.2015.1004812.

Description

Title: Assessment of experimental optical techniques for characterizing heat transfer using numerical simulations
Author/s:
  • López Juste, Gregorio
  • Fajardo, P.
Item Type: Article
Título de Revista/Publicación: Engineering Applications of Computational Fluid Mechanics
Date: 2015
ISSN: 1994-2060
Volume: 9
Subjects:
Faculty: E.T.S. de Ingeniería Aeronáutica y del Espacio (UPM)
Department: Mecánica de Fluidos y Propulsión Aeroespacial
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

This manuscript addresses the application of numerical simulations for assessing the error in the measurement of the bulk temperature along the laser beam of a 3D flow using a 2D Moiré deflectometry analysis. To analyze the effect of different flow parameters on the error, a 3D computational model of an experimental system was developed. The simulated domain represents the well-known solution of the backward facing step in a rectangular channel but includes a hot-plate at the bottom of the step to enhance the heat transfer effects. The geometry resembles that found in a general heat exchanger. The difference between the computed bulk temperature of the flow and the average temperature obtained via the 2D Moiré is analytically evaluated for various assumed general temperature profiles; the numerically computed profiles of temperature indicates that the error decreases with the channel aspect ratio. The use of CFD enables the determination of the flow topology and thus an evaluation of the 3D flow behavior that will cause the measurement error. A parametric study was performed for different flow conditions, namely, the aspect ratio of the channel, the inflow conditions (flow velocity or Reynolds number), and the temperature of the hot wall. The results indicate that the Moiré technique is suitable for evaluating the bulk temperature in typical heat exchange devices and flow conditions.

More information

Item ID: 44781
DC Identifier: http://oa.upm.es/44781/
OAI Identifier: oai:oa.upm.es:44781
DOI: 10.1080/19942060.2015.1004812
Official URL: http://www.tandfonline.com/doi/abs/10.1080/19942060.2015.1004812
Deposited by: Memoria Investigacion
Deposited on: 17 Mar 2017 13:24
Last Modified: 17 Mar 2017 13:24
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