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Research Papers: Forced Convection

A New Transient High Heat Flux Convection Calibration Facility for Heat Transfer Gauges in High Enthalpy Flows

[+] Author and Article Information
R. J. Lubbock

Osney Thermo-Fluids Laboratory,
Department of Engineering Science,
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: kebl3134@gmail.com

S. Luque, B. R. Rosic

Osney Thermo-Fluids Laboratory,
Department of Engineering Science,
University of Oxford,
Oxford OX1 3PJ, UK

1Corresponding author.

2Present address: Unit of High Temperature Processes, IMDEA Energy Institute, Avda. Ramon de la Sagra, 3, Mostoles 28935, Spain.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received December 27, 2015; final manuscript received August 31, 2017; published online January 3, 2018. Assoc. Editor: Milind A. Jog.

J. Heat Transfer 140(4), 041701 (Jan 03, 2018) (10 pages) Paper No: HT-15-1820; doi: 10.1115/1.4038339 History: Received December 27, 2015; Revised August 31, 2017

This paper presents a novel transient method for calibrating heat transfer gauges for convective wall heat flux measurements in high enthalpy flows. The new method relies on the transient heating of sensor substrates under rapid exposure to a hot flow in order to obtain the necessary reference heat flux. Compared to previous calibration facilities, the new facility is simple, inexpensive, easy to adapt for different flow configurations and sensor geometries, and quick to run across a wide range of conditions. In this paper, the design of the new calibration facility is described and the transient calibration method explained. The method is demonstrated by calibrating a Gardon gauge at convective heat transfer coefficients between 300 and 600 W/m2 K. Typical facility data and calibration results are presented in terms of voltage-heat flux sensitivity and calibration correction ratio. These results are shown to agree with theoretical estimates within the estimated calibration uncertainty.

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Figures

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Fig. 2

The main components of the new transient convection calibration facility

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Fig. 1

Schematic of the new transient convection calibration experimental facility

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Fig. 3

Photos showing the position of the plates before and after insertion during stagnation-flow tests. The infrared camera is shown in the upper left of each picture.

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Fig. 4

Boundary layer heat transfer studies using the rectangular section letterbox nozzle and traverse in shear-flow configuration

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Fig. 5

The ceramic reference plate painted with high-emissivity high-temperature automotive exhaust paint

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Fig. 6

View upstream into the main nozzle showing the radiation shield

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Fig. 7

The copper calibration plate painted with high-emissivity high-temperature automotive exhaust paint

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Fig. 9

An example of the ceramic reference plate surface temperature measured using the IR camera 3 s after insertion at the highest heat-flux condition in the present tests

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Fig. 10

An example of the copper calibration plate surface temperature measured using the IR camera 3 s after plate insertion at the highest heat-flux condition in the present tests

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Fig. 11

Typical reference plate surface temperature and heat fluxes

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Fig. 8

The 5 mm diameter Gardon gauge used in the present study

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Fig. 12

Least-squares fit of Eq. (1) to obtain huw and Taw

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Fig. 13

Typical calibration plate surface temperature and heat fluxes

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Fig. 14

The measured gauge convection sensitivity alongside the theoretically estimated sensitivity (Eq. (A9)) and the manufacturer radiation sensitivity

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Fig. 16

Schematic cross section of a Gardon gauge showing arbitrary temperature distribution

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Fig. 15

The experimentally measured convection correction factor. The uncorrected manufacturer calibration is shown for clarity, represented by a ratio of unity.

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