Experimental study on combined buoyant-thermocapillary flow along with rising liquid film on the surface of a horizontal metallic mesh tube

Gomes, Manuel J.; Mei, Ning

doi:10.1007/s11708-017-0483-5

Cited by 1 publication

(1 citation statement)

References 14 publications

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“…Panchal et al [14] used ten thermocouples to record the surface temperatures of a battery, under the assumption that each temperature represented an average temperature of the area around the sensor. Thermocouples have small dimensions and ease of handling but are required to be attached to the surfaces that they measure [15,16]; for example, Martínez et al [17] welded 26 thermocouples directly into a wall plate to measure wall temperatures. Moreover, the use of thermocouples affects the nearby flow field [18].…”

Section: Introductionmentioning

confidence: 99%

Measuring surface temperatures of different types of fly ash samples using a CCD camera

et al. 2022

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In this work, an optical emission-based two-color method was experimentally investigated for the measurement of surface temperatures of different types of fly ash samples using a CCD camera. A heating system consisting of a Hencken flat-flame burner, a narrow piece of stainless steel wire mesh to separate the flame and the ash samples to be studied, and a thermocouple to record the temperature, was used to heat fly ash samples. A color camera equipped with a tri-band filter was used to capture radiation images. Fly ash samples collected from three kinds of coal-fired boilers were heated and imaged at different temperatures. The chemical compositions, elements, and particle size distributions were analyzed. The emissivity ratios of the wavelengths corresponding to the R and G optical channels and permitted by the tri-band filter were experimentally determined. A two-color method was subsequently used to calculate the average surface temperatures with relative errors within ? 2 % in the experiments, and an uncertainty analysis was conducted. Surface temperature distributions were also calculated and presented. The results demonstrate that the emission-based two-color method can be used to determine reliable average surface temperatures and surface temperature distributions when the radiation emitted from the ash samples is obviously greater than the ambient light. The results also show that the method has a lower limit of temperature measurement, which will lessen with the use of larger apertures and a higher radiation capacity of the ash samples to be studied.

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